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# The Solar system and the Earth Online Test 11th Geography Lesson 2 Questions in English

## The Solar system and the Earth-11th Geography Lesson 2 Questions in English-Online Test

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 Question 1
Laplace revised the argument of earth’s origin by German professor Immanuel Kant in1796, which is known as?
 A Big bang theory B Nebular Hypothesis C Plate tectonics theory D Singularity
Question 1 Explanation:
One of the earlier and popular arguments of the earth’s origin was by a German professor Immanuel Kant. Mathematician Laplace revised it in 1796. It was known as Nebular Hypothesis. It considered that planets were formed out of a cloud of material associated with a youthful sun, which was slowly rotating.
 Question 2
Who propounded the accretion theory?
 A Lyttleton B Hubble C Lemaitre D Immanuel
Question 2 Explanation:
Lyttleton propounded the accretion theory of the earth’s formation.
 Question 3
According to which theory, approximately 4.6 billion years ago, the solar system was a cloud of dust?
 A Big bang theory B Nebular Hypothesis C Plate tectonics theory D Accretion theory
Question 3 Explanation:
According to this theory, approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula
 Question 4
Which of the following is formed the sun?
 A Gas giants B Solar wind C Solar nebula D Solar storm
Question 4 Explanation:
The solar nebula started to spin, the gravity collapsed the materials on itself and it formed the sun as the center of the solar system. When the sun formed, the remaining materials began to clump up. Small particles drew together, bound by the force of gravity, into larger particles.
 Question 5
1. The solar wind swept away lighter elements like hydrogen and helium
2. Only heavy rocky materials left by these winds created planets
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 5 Explanation:
The solar wind swept away lighter elements, such as hydrogen and helium, from the closer regions. It left only heavy rocky materials to create planets like the Earth. But farther away, the solar winds had less impact on lighter elements, allowing them to consolidate into gas giants. In this way, planets, moons, asteroids, comets, etc., were created.
 Question 6
_______ is a vast endless space which includes galaxies, stars, planets and others?
 A Universe B Milky way galaxy C Solar system D Constellation
Question 6 Explanation:
The universe is a vast endless space which includes galaxies, stars, planets and other forms of matter and energy in it.
 Question 7
Consider the following statements find the incorrect one
1. Voyager 2 travelling speed - more than 62,764.416 km/h
2.  Still take more than 269,000 years to pass Deimos
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 7 Explanation:
Voyager 2 travelling at the speed of more than 62,764.416 km/h will still take more than 296,000 years to pass Sirius, the brightest star in our night sky
 Question 8
Earth’s __________ is formed first when heavy elements collided and bound together
 A Mantle B Crust C Core D Rocks
Question 8 Explanation:
Earth's rocky core formed first when heavy elements collided and bound together. Dense materials sank to the center, while the lighter material created the crust. The planet's magnetic field probably formed around this time.
 Question 9
Gravity captured some of the gases that made up the planet's ______
 A Atmosphere B Gaseous planets C Celestial bodies D Galaxy
Question 9 Explanation:
Gravity captured some of the gases that made up the planet's early atmosphere.
 Question 10
Expanding universe hypothesis is otherwise called as
 A Big bang theory B Nebular Hypothesis C Plate tectonics theory D Accretion theory
Question 10 Explanation:
The Big Bang Theory is about the origin of the universe also called as expanding universe hypothesis
 Question 11
Find out the incorrect statement
 A Abbe Georges Lemaitre, was the first to propose, a theory on the origin of the universe B According to big bang theory, the universe was formed before 11.75 million years ago. C Earth's rocky core formed first when heavy elements collided and bound together D Sirius, the brightest star in our night sky.
Question 11 Explanation:
According to big bang theory, the universe was formed before 13.75 billion years ago
 Question 12
Theory of Edwin Hubble is
 A Accretion theory B Expanding universe hypothesis C Nebular hypothesis D Plate tectonic theory
Question 12 Explanation:
The most popular argument regarding the origin of the universe is the Big Bang Theory. It is also called expanding universe hypothesis. Edwin Hubble who provided the evidence that the universe is expanding, was called, ‘the Big Bang Theory’.
 Question 13
______ is called as cluster of many stars
 A Nebula B Constellation C Solar system D Galaxy
Question 13 Explanation:
A galaxy is a system of billions of stars, stellar remnants, interstellar gas, dust, and dark matter which are attached due to gravitational attraction
 Question 14
Consider the following statements, find out the incorrect one
1. The word galaxy is derived from the Latin word Galaxias
2.  It means literally “milky”, a reference to the Milky Way
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 14 Explanation:
The word galaxy is derived from the Greek word Galaxias, literally “milky”, a reference to the Milky Way. Our solar system presents in Milky Way galaxy.
 Question 15
Consider the following statements about big bang theory, find the correct statements
1. The explosion started 13.75 billion years ago
2.  Within an hour it started swelling from small size to its current size.
3.  Matter from the universe was thrown out with great force in all directions
4. From this matter, many groups of stars were formed which we call ‘galaxies’
 A 1, 2, 3, 4 B 1, 3,4 C 1,2,3 D 1, 2, 4
Question 15 Explanation:
According to big bang theory, the universe was formed 13.75 billion years ago. Like a rapidly expanding balloon, it swelled from a size smaller than an electron to nearly its current size within a fraction of a second. Matter from the universe was thrown out with great force in all directions and started expanding outwards. From this matter, many groups of stars were formed which we call ‘galaxies
 Question 16
_______ Galaxy has a central concentration of stars known as the ‘bulge’.
 A Elliptical galaxy B Irregular galaxy C Spiral galaxy D Spherical galaxy
Question 16 Explanation:
Spiral Galaxies consists of a flat and rotating disk of stars, gases and dust. It has a central concentration of stars known as the ‘bulge’.
 Question 17
Match the following]
1. Elliptical galaxy     - a.  Milky Way
2. Irregular galaxy      - b. Messier89
3. Spiral galaxy           - c.  Magellanic Cloud
 A b c a B a b c C c a b D b a c
Question 17 Explanation:
Messier89 galaxy is an elliptical galaxy. Large Magellanic Cloud is an example of irregular galaxy. The Milky Way is spiral galaxies.
 Question 18
Andromeda is an example of
 A Elliptical galaxy B Irregular galaxy C Spiral galaxy D Spherical galaxy
Question 18 Explanation:
Spiral Galaxies consists of a flat and rotating disk of stars, gases and dust. It has a central concentration of stars known as the ‘bulge’. The Milky Way and the Andromeda are spiral galaxies.
 Question 19
______ Galaxy contains older stars with fewer gases
 A Elliptical galaxy B Irregular galaxy C Spiral galaxy D Spherical galaxy
Question 19 Explanation:
Elliptical Galaxies contains older stars with fewer gases. Messier89 galaxy is an elliptical galaxy.
 Question 20
Consider the following statements about irregular galaxy and find the correct statement
 A Irregular Galaxies are youthful galaxies B It contains lesser amount of dust and gases. C These gases can make them very light D Andromeda is an example of irregular galaxy.
Question 20 Explanation:
Irregular Galaxies are youthful galaxies with more dust and gases. This can make them very bright. Large Magellanic Cloud is an example of irregular galaxy.
 Question 21
Initially, the universe was saturated only by _____?
 A Atoms B Light C Stars D Energy
Question 21 Explanation:
Initially, the universe was saturated only by energy. Some of this energy set into particles, which assembled into light atoms like hydrogen and helium. These atoms grouped first into galaxies, then stars and all the other elements.
 Question 22
_______% of the substances in the universe cannot be seen?
 A 96 % B 94% C 95% D 98%
Question 22 Explanation:
The stars, planets and galaxies that can be detected make up only 4 % of the universe, according to astronomers. The other 96 % of the substances in the universe cannot be seen or easily understandable
 Question 23
Consider the following statements find the correct answer
1. Gravitational lensing confirmed the age of the universe and the strength of dark energy.
2. Dark energy is responsible for the accelerating expansion of the universe
 A a only B b only C Both a and b D Neither a nor b
Question 23 Explanation:
The new measurement technique called gravitational lensing confirmed the age of the universe and the strength of dark energy. Dark energy is responsible for the accelerating expansion of the universe. Scientists used gravitational lensing to measure the distances light traveled from a bright, active galaxy to the earth and some details of its expansion.
 Question 24
Saul Perlmutter, Brian Schmidt and Adam Riess won the Nobel Prize in Physics for
 A The explosion of universe before billion years ago B The universe is just expanding and picking up speed. C Gravitational force of the universe D The universe is spherical shape
Question 24 Explanation:
Three scientists, Saul Perlmutter, Brian Schmidt and Adam Riess won the Nobel Prize in Physics (2011) for their discovery that the universe is just expanding and picking up speed.
 Question 25
Match the following
1. Constellation                        - 1. Nearest star to sun
2. Sirius                                      - 2. Nearest star to earth
3. Sun                                          - 3. Group of stars
4. Proxima centauri                 - 4. Brightest star than sun
 A 3, 4, 2, 1 B 1, 2, 3, 4 C 3, 4, 1, 2 D 4, 3, 2, 1
Question 25 Explanation:
The nearest star to the earth is sun. The brightest star than sun is Sirius. Proxima centauri is the nearest star to the sun. Constellation is called as group of stars forms a particular shape in the sky.
 Question 26
1. A star is an astronomical object which has does not have its own light and heat
2. A star changes it’s form during its lifetime as neutron star, black hole, dwarf star, red giant star
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 26 Explanation:
A star is an astronomical object which has does not have its own light and heat. A star changes its form during its lifetime as neutron star, black hole, dwarf star, red giant star.
 Question 27
What is IAU stands for
 A International Astrophysical Unit B International Astronomical Unit C International Astrological Unit D International Aeronautical Unit
Question 27 Explanation:
International Astronomical Unit adopted official constellation boundaries that defined 88 constellations
 Question 28
Consider the following statements and choose the correct answer
1. Constellation is called as group of stars forms a particular shape in the sky.
2.  International Astronomical Unit adopted official constellation boundaries that defined 88 constellations
3.  Ptolemy in his book almagest listed 48 constellations
 A 1, 2 B 2, 3 C 3, 1 D All the above
Question 28 Explanation:
Constellation is called as group of stars forms a particular shape in the sky. International Astronomical Unit adopted official constellation boundaries that defined 88 constellations.
 Question 29
Almagest is a book by
 A Ptolemy B Hubble C Lemaitre D Immanuel
Question 29 Explanation:
Earlier, Ptolemy in his book mentioned about 48 constellation.
 Question 30
Consider the following statements choose the incorrect answer
1. Ursa Major is a constellation that can be seen in the northern hemisphere and part of the southern hemisphere.
2. Ursa Major means Great Bear in Greek.
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 30 Explanation:
Ursa Major is a constellation that can be seen in the northern hemisphere and part of the southern hemisphere. Ursa Major means Great Bear in Latin.
 Question 31
Consider the following statements and choose the incorrect answer
1. A solar system consists of a star at the center and the eight planets
2. These planets revolve around the sun in fixed elliptical paths known as ‘orbits’.
 A 1 only B 2 only C Both 1&2 D Neither 1 nor 2
Question 31 Explanation:
A solar system consists of a star at the center and the eight planets, moons, asteroids comets and meteoroids that revolve it. The eight planets, namely the Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, revolve around the sun in fixed elliptical paths known as ‘orbits’.
 Question 32
Most stars host their own ______?
 A Planets B Satellites C Galaxy D None of the above
Question 32 Explanation:
Most of stars host their own planets. So there are billions of other solar systems in the Milky Way galaxy alone.
 Question 33
If there are three or more stars in our solar system it is called as
 A Binary star system B Tertiary star system C Multi star system D Neutron star system
Question 33 Explanation:
Solar systems can also have more than one star. These are called binary star systems if there are two stars or multi-star systems if there are three or more stars.
 Question 34
1. Our solar system is located in an inner spiral arm of the vast Milky Way galaxy.
2.  Our solar system orbits the center of the Milky Way Galaxy at about 848,000 km/h.
 A 1 only B 2 only C Both 1 & 2 D Neither 1 nor 2
Question 34 Explanation:
Our solar system is located in an outer spiral arm of the vast Milky Way galaxy. Our solar system orbits the center of the Milky Way Galaxy at about 828,000 km/h.
 Question 35
1. Our solar system take 230 million years to complete one orbit around the galactic center.
2.  The solar system  have been formed about 3.6 billion years ago
 A 1 only B 2 only C Both 1 & 2 D Neither 1 nor 2
Question 35 Explanation:
Our solar system takes about 230 million years to complete one orbit around the galactic center. The solar system is believed to have been formed about 4.6 billion years ago
 Question 36
Kuiper Belt that lies past which planets orbit?
 A Pluto B Neptune C Uranus D Saturn
Question 36 Explanation:
The solar system is believed to have been formed about 4.6 billion years ago. The solar system also includes the Kuiper Belt that lies past Neptune's orbit. This is a sparsely occupied ring of icy bodies.
 Question 37
Consider the below statements about Kuiper belt and find the incorrect one
1. Kuiper Belt that lies past Neptune's orbit.
2. This is a sparsely occupied ring of icy bodies.
3. This is almost all smaller than the proto star Pluto.
 A 1 only B 3 only C All the above D None of the above
Question 37 Explanation:
Kuiper Belt that lies past Neptune's orbit. This is a sparsely occupied ring of icy bodies. This is almost all smaller than the dwarf planet Pluto.
 Question 38
Asteroid belt is located between
 A Mars & Jupiter B Mars & Venus C Jupiter & Saturn D Mars & Earth
Question 38 Explanation:
Asteroid belt is located between mars and Jupiter.
 Question 39
Beyond the fringes of the Kuiper belt ______ is presented?
 A Dwarf star B Nebula C Oort cloud D Proto star
Question 39 Explanation:
Beyond the fringes of the Kuiper belt, oort cloud is existing. This giant spherical shell surrounds our solar system. It has never been directly observed, but its existence is predicted based on mathematical models and observations of comets that likely originate there.
 Question 40
Find out the correct statement about oort cloud
1. The Oort cloud is made up of gaseous particles of space debris.
2.  It is orbiting our Sun as far as 1.4 light years away.
3.  This shell of material is thick, extending from 1,000 astronomical units to 100,000 astronomical units.
 A 1, 2 B 2,3 C All the above D None of the above
Question 40 Explanation:
The Oort cloud is made up of icy pieces of space debris. It is orbiting our Sun as far as 1.6 light years away. This shell of material is thick, extending from 5,000 astronomical units to 100,000 astronomical units.
 Question 41
1. One astronomical unit (AU) is the distance from the Sun to moon
2.  One astronomical unit is 150 million kilometer
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 41 Explanation:
One astronomical unit (AU) is the distance from the Sun to Earth, or about 150 million kilometer
 Question 42
There are how many known natural satellites in our solar system?
 A 153 B 163 C 160 D 162
Question 42 Explanation:
There are more than 163 known natural satellites in our solar system and several more awaiting confirmation of discovery
 Question 43
Find the planets without satellites
 A Venus and Pluto B Mercury and Venus C Mercury and Uranus D Venus and Mars
Question 43 Explanation:
Of the eight planets, Mercury and Venus are the only planets with no satellites
 Question 44
Which of the  following planet has more satellites
 A Earth B Mars C Jupiter D Pluto
Question 44 Explanation:
Of the eight planets, Mercury and Venus are the only planets with no satellites while the Jupiter and Saturn have the highest number of satellites in our solar system
 Question 45
The Sun is at the center of our solar system which is a _____  star,
 A Proto star B Dwarf star C Neutron star D Red giant star
Question 45 Explanation:
The Sun is at the center of our solar system. It is a yellow dwarf star, with a hot ball of glowing gases. Its gravity holds the solar system together and it keeps everything from the biggest planets to the smallest particles of debris in its orbit.
 Question 46
Electric currents in the ____ will generate a magnetic field with the help of solar wind.
 A Sun B Earth C Kuiper belt D Jupiter
Question 46 Explanation:
Electric currents in the Sun generate a magnetic field that is carried out through the solar system by the solar wind.
 Question 47
1. The Sun is made up of about 70.6% hydrogen and 27.4% helium.
2. There are three main layers in the Sun's interior: the core, the radiative zone, and the conductive zone
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 47 Explanation:
The Sun is made up of about 70.6% hydrogen and 27.4% helium by mass. The Sun's enormous mass is held together by gravitational attraction, producing immense pressure and temperature at its core. There are three main layers in the Sun's interior: the core, the radiative zone, and the convective zone
 Question 48
___ is the hottest region of sun
 A Core B Mantle C Convective zone D Radiative zone
Question 48 Explanation:
Sun's interior: the core, the radiative zone, and the convective zone. The core is at the center. It is the hottest region, of the sun.
 Question 49
Energy is carried outward through radiative layer is carried by ______?
 A Proton B Electron C Photon D Neutron
Question 49 Explanation:
The radiative (or radiation) zone. Its name is derived from the way energy is carried outward through this layer, carried by photons as thermal radiation
 Question 50
Find out the correct statement about sun
 A Core is the hottest region the nuclear fission reaction takes place to give the sun power B The third and final region of the sun is named the conductive zone. C Conductive zone is named after the dominant mode of energy flow in this layer. D Sun is a yellow dwarf star, with a hot ball of glowing gases.
Question 50 Explanation:
The core is at the centre. It is the hottest region, where the nuclear fusion reaction to give the sun power. Moving outward next come the radiative (or radiation) zone. Its name is derived from the way energy is carried outward through this layer, carried by photons as thermal radiation. The third and final region of the solar interior is named the convective (or convection) zone. It is also named after the dominant mode of energy flow in this layer.
 Question 51
The boundary between the Sun's interior and the solar atmosphere is called?
 A Chromosphere B Corona C Photosphere D Atmosphere
Question 51 Explanation:
The boundary between the Sun's interior and the solar atmosphere is called the photosphere. It is what we see as the visible ‘surface’ of the Sun.
 Question 52
Consider the following statements:
• Assertion (A): The lower region of the solar atmosphere is called the chromosphere.
• Reason (R): it appears bright red when viewed during a solar eclipse
Codes
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 52 Explanation:
The lower region of the solar atmosphere is called the chromosphere. Its name is derived from the Greek word Chroma (meaning color), for it appears bright red when viewed during a solar eclipse.
 Question 53
Consider the following statements choose the incorrect answer
 A A thin transition region separates the chromospheres from the vast photosphere above. B The uppermost portion of the Sun's atmosphere is called the corona C Corona is much hotter than the Sun's surface (photosphere) D The upper corona gradually turns into the solar wind
Question 53 Explanation:
A thin transition region, where temperature rises sharply, separates the chromospheres from the vast corona above. The uppermost portion of the Sun's atmosphere is called the corona, and is surprisingly much hotter than the Sun's surface (photosphere). The upper corona gradually turns into solar wind. Solar wind is a flow of plasma that moves outward through our solar system into interstellar space.
 Question 54
The Sun has totally how many regions?
 A Six B Seven C Five D Three
Question 54 Explanation:
The Sun has six regions: the core, the radioactive zone, and the convective zone in the interior; the photosphere; the chromospheres and corona.
 Question 55
Surface temperature of sun is____?
 A 4000-5000 B 4500-5500 C 5500-6000 D 6000-6500
Question 55 Explanation:
The temperature of the sun’s surface is about 5,500 to 6,000 degrees Celsius.
 Question 56
Consider the following statements find the incorrect answer
1. The core temperature of sun is 13 million degrees Celsius
2.  Thermonuclear fission is a process in which atoms combine to form larger atoms
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 56 Explanation:
At the core, the temperature is about 15 million degrees Celsius, which is sufficient to sustain thermonuclear fusion. This is a process in which atoms combine to form larger atoms and in this process, released, staggering amounts of energy.
 Question 57
Consider the following statements find the incorrect answer
1. In the Sun’s core, hydrogen atoms fuse to make helium.
2.  In the Sun’s core, helium atoms fuse to make hydrogen.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 57 Explanation:
In the Sun’s core, hydrogen atoms fuse to make helium.
 Question 58
What is the radius of sun?
 A 665,508 kilometers B 685,505 kilometers C 695,508 kilometers D 659,508 kilometers
Question 58 Explanation:
The sun has a radius of 695,508 kilometers.
 Question 59
The Sun’s volume would need _____ many Earths to fill it.
 A 1.1 million B 1.2 million C 1.3 million D 1.4 million
Question 59 Explanation:
The Sun’s volume would need 1.3 million Earths to fill it. The sun has a radius of 695,508 kilometers. It is far more massive than earth and 332946 Earths equal to the mass of the Sun.
 Question 60
Consider the following statements find the correct answer
1. Venus is hotter than Mercury
2. Venus has an atmosphere which is thicker
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 60 Explanation:
Venus is hotter than Mercury because Venus has an atmosphere which is thicker and made almost entirely of carbon dioxide.
 Question 61
Consider the following statements find the incorrect answer
 A The Milky Way has four main spiral arms B The arms of sun are Norma and Cygnus arm, Sagittarius, Aquila-Crux, and Perseus. C The Sun is located in a minor arm, the Sagittarius arm D The Sun orbits the center of the Milky Way Galaxy.
Question 61 Explanation:
The Milky Way has four main spiral arms: the Norma and Cygnus arm, Sagittarius, Scutum-Crux, and Perseus. The Sun is located in a minor arm, the Sagittarius arm. From there, the Sun orbits the center of the Milky Way Galaxy, bringing the planets, asteroids, comets and other objects along with it
 Question 62
Consider the following statements find the correct answer
1. Velocity of solar system 848,000 kilometers per hour.
2.  Solar system takes 2300 million years to make one complete orbit around the Milky Way.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 62 Explanation:
Our solar system is moving with an average velocity of 828,000 kilometers per hour. It takes about 230 million years to make one complete orbit around the Milky Way.
 Question 63
Consider the following statements find the incorrect answer
 A The Sun’s spin has an axial tilt of 7.25 degrees B The Sun is not a solid body, different parts of the Sun rotate at different rates. C At the equator, the Sun spins around once about every 52 days D At its poles the Sun rotates once on its axis every 36 Earth days
Question 63 Explanation:
The Sun’s spin has an axial tilt of 7.25 degrees with respect to the plane of the planets’ orbits. Since the Sun is not a solid body, different parts of the Sun rotate at different rates. At the equator, the Sun spins around once about every 25 days, but at its poles the Sun rotates once on its axis every 36 Earth day.
 Question 64
The Sun alone accounts for ____% of the mass of the entire solar system.
 A 99.7 B 99.8 C 99.5 D 99.9
Question 64 Explanation:
The Sun alone accounts for 99.8% of the mass of the entire solar system.
 Question 65
Scientists predict that in how many years the Sun will last & shrinks down?
 A 5.6 billion B 6.5 billion C 4.5 billion D 6.8 billion
Question 65 Explanation:
Scientists predict that the Sun is a little less than halfway through its lifetime and will last another 6.5 billion years before it shrinks down to be a white dwarf. Like all stars, the Sun will someday run out of energy. When the Sun starts to die, it will swell so big that it will engulf Mercury and Venus and maybe even Earth.
 Question 66
Consider the following statements find the incorrect answer
1. The word planet in Persian means ‘wanderer’.
2.  Planet is the celestial body which  have light or heat of its own
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 66 Explanation:
The word planet in Greek means ‘wanderer’. Planet is the celestial body which does not have light or heat of its own
 Question 67
A planet should possess which of the following qualities?
1. It should orbit around the sun.
2. It should not be a satellite of any planet
3. Due to its own mass and self-gravity, it should get a spherical shape and
4. Any other celestial body should not cross in its orbit
 A 1, 2, 4 B 1, 2, 3 C 1, 2, 3, 4 D 1, 3, 4
 Question 68
Find the incorrectly matched pair
 A Inner planet - Mercury B Gaseous planet - Venus C Rocky planet - Mars D Giant planet - Jupiter
Question 68 Explanation:
The planets are classified in order of their distance from the sun and based on their characteristics. They are: The inner planets or terrestrial planets or rocky planets -Mercury, Venus, Earth and Mars are called inner or terrestrial planets. The outer planets or gaseous planets or giant planets - Jupiter, Saturn, Uranus and Neptune are called outer or gaseous planets
 Question 69
Find out the terrestrial planets
 A Mars and Venus B Mars and Jupiter C Earth and Saturn D Earth and Uranus
Question 69 Explanation:
The inner planets or terrestrial planets or rocky planets -Mercury, Venus, Earth and Mars are called inner or terrestrial planets. The outer planets or gaseous planets or giant planets - Jupiter, Saturn, Uranus and Neptune are called outer or gaseous planets
 Question 70
Each planet spins on its own axis is called?
 A Revolution B Rotation C Orbit D Earth day
Question 70 Explanation:
Each planet spins on its own axis. This movement is called rotation. One rotation makes one ‘planet day’. The planets moving around the sun is called revolution or a ‘planet-year’
 Question 71
Find the correct statements about Mercury
1. Mercury is the nearest planet to the sun
2. It is the smallest planet in the solar system.
3. It has many satellites.
4. It rotates on its own axis in 54.65 earth days.
5. It takes 88 Earth days to complete one revolution around the sun
 A 1, 2, 3 B 1, 4, 5 C 1, 2, 5 D 1, 4, 3
Question 71 Explanation:
Mercury is the nearest planet to the sun and it is the smallest planet in the solar system. It does not have any satellite. It rotates on its own axis in 58.65 earth days while it takes 88 Earth days to complete one revolution around the sun
 Question 72
Which is the second hottest planet in solar system
 A Earth B Mercury C Venus D Neptune
Question 72 Explanation:
Mercury is 0.4 astronomical units away from the Sun. Mercury is the second hottest planet though it is nearest to the sun.
 Question 73
The sunlight takes ______minutes to travel from the Sun to Mercury?
 A 2.3 minutes B 3.6 minutes C 3.2 minutes D 2.2 minutes
 Question 74
Consider the following statements:
• Assertion (A): Venus is called as Earth’s sister
• Reason (R): Its size and mass is similar as that of our Earth
Codes
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 74 Explanation:
‘Venus’ is the second nearest planet to the sun. It is also called as ‘Earth’s Sister’ planet due to its similar size and mass as that of our Earth.
 Question 75
Uranus and which planet have the ‘backwards’ rotation?
 A Neptune B Pluto C Venus D Saturn
Question 75 Explanation:
Venus rotates clockwise i.e. east to west direction on its own axis. The rotation and orbit of the Venus are unusual in several ways. Venus is one of just two planets that rotate from east to west. Only Venus and Uranus have this ‘backwards’ rotation.
 Question 76
Find the correct statement about Venus
1. It is popularly known as “Morning star and Evening star”.
2. It completes one rotation in 243 Earth days.
3. The Venus takes 224.7 Earth days to complete one revolution around the sun,
4. It has no natural satellites
 A 1, 2, 4 B 1, 2, 3, 4 C 1, 4, 2 D None of the above
Question 76 Explanation:
It completes one rotation in 243 Earth days which is the longest day of any planet in our solar system. The Venus takes 224.7 Earth days to complete one revolution around the sun, and it has no natural satellites. Venus is 0.7 astronomical units away from the sun. The sunlight takes 6 minutes to travel from the sun to Venus. It is popularly known as “Morning star and Evening star” It is seen in the east sky before sunrise (dawn) in the morning and in the west sky after the sunset (twilight).
 Question 77
Which is the hottest planet in the solar system
 A Neptune B Pluto C Venus D Saturn
Question 77 Explanation:
Venus is the hottest planet in the solar system than mercury because of presence of atmosphere and it experiences a mean surface temperature of 462 degrees Celsius.
 Question 78
____ is the fifth largest planet in the solar system
 A Neptune B Pluto C Earth D Saturn
Question 78 Explanation:
Earth is the third nearest planet to the sun. It is the fifth largest planet in the solar system. The Earth’s orbit lies between the orbits of Venus and Mars.
 Question 79
Find out the correct statements
1.  The Earth takes 23 hours 56 minutes and 4 seconds for the earth to complete one revolution
2.  The Earth takes 365.25 days to complete one rotation around the Sun.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 79 Explanation:
The Earth takes 23 hours 56 minutes and 4 seconds for the earth to complete one rotation on its own axis. The Earth takes 365.25 days to complete one revolution around the Sun.
 Question 80
____is the densest planet in the solar system?
 A Neptune B Pluto C Earth D Saturn
Question 80 Explanation:
Earth’s surface temperature varies from – 88 to 58 degree Celsius and it is the densest planet in the solar system. The Earth is a unique planet because of its distance from the sun, its motions, atmosphere with oxygen, presence of water and moderate temperature. The earth is neither too close nor too far from the sun. It is the only known planet to support life.
 Question 81
Consider the following statements:
• Assertion (A): Earth is called as blue planet
• Reason (R):  Because of presence of thick blue atmosphere
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 81 Explanation:
Earth is the only known planet to support life. It is also known as the ‘Blue Planet’ because of the presence of water. Earth has only one natural satellite called the Moon.
 Question 82
The sun light takes _____minutes to reach the earth?
 A 8.1 minutes B 8.2 minutes C 7.3 minutes D 8.4 minutes
 Question 83
Consider the following statements:
• Assertion (A): Mars is described as the “Red planet”.
• Reason (R):  It is reddish in Color due to the presence of Aluminum oxide on its surface
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 83 Explanation:
Mars is also described as the “Red planet”. It is reddish in color due to the presence of iron oxide on its surface
 Question 84
1. Mars is the fourth nearest planet to the sun and
2. It is the third smallest planet in the Solar system.
3. It is also described as the “Red planet”.
4. The landmass of Mars and Mercury are very similar.
 A 1, 2, 3 B 1, 4, 5 C 2, 4 D 1, 4, 3
Question 84 Explanation:
Mars is the fourth nearest planet to the sun and it is the second smallest planet in the Solar system. It is also described as the “Red planet”. It is reddish in color due to the presence of iron oxide on its surface. The landmass of Mars and Earth are very similar.
 Question 85
Except the Earth which planet has is the most hospitable to life
 A Neptune B Pluto C Mars D Saturn
Question 85 Explanation:
With the exception of the Earth, Mars probably is the most hospitable to life. This planet has seasons, polar ice caps, volcanoes, canyons and weather. Mars has two satellites namely Phobos and Deimos. It takes 24 hours and 37 minute to complete one rotation on its axis and its takes 687 days to complete one revolution around the Sun
 Question 86
Find the incorrect statement about Jupiter
 A Jupiter is the largest planet in the solar system. B It is made primarily of gases and is known as ‘Giant Gas planet’ C It takes 7 hours 55 minutes to complete one rotation on its axis D It takes 11.86 years to complete one revolution
Question 86 Explanation:
Jupiter is the largest planet in the solar system. It is made primarily of gases and is therefore known as ‘Giant Gas planet’. It takes 9 hours 55 minutes to complete one rotation on its axis and it takes 11.86 years to complete one revolution
 Question 87
Which planet has shortest day in our solar system
 A Earth B Jupiter C Venus D Neptune
Question 87 Explanation:
Jupiter has the shortest day in the solar system. Jupiter has a faint ring system around it. They are mostly comprised of dust particles.
 Question 88
1. Jupiter has 63 confirmed satellites orbiting the planet.
2.  Ganymede, the satellite of Jupiter.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 88 Explanation:
Jupiter has 67 confirmed satellites orbiting the planet. Ganymede, the satellite of Jupiter.
 Question 89
Which  is the largest natural satellite in the solar system
 A Phobos B Deimos C Europa D Ganymede
Question 89 Explanation:
Ganymede, the satellite of Jupiter, is the largest natural satellite in the solar system (even bigger than the planet Mercury).
 Question 90
Deimos is the satellite of which planet
 A Earth B Mars C Venus D Neptune
 Question 91
Which planet’s average density is less than water?
 A Earth B Saturn C Venus D Neptune
Question 91 Explanation:
Saturn is the only planet in our solar system whose average density is less than water.
 Question 92
 A Saturn is the seventh planet from the sun. B The largest planet in the solar system. C Saturn is called as the Ringed Planet. D These rings are mostly made from the chunks of ice and carbon dust.
Question 92 Explanation:
Saturn is the sixth planet from the sun and the second largest planet in the solar system. Saturn is called as the Ringed Planet. It is because of large, beautiful and extensive ring systems that encircles the planet. These rings are mostly made from the chunks of ice and carbonaceous dust.
 Question 93
1. The Saturn has 35rings.
2. It has 63 confirmed natural satellites.
3. The Saturn takes 10 hours 34 minutes to complete one revolution.
4. It takes 29.4 years to complete one rotation around the sun.
 A 1, 2 B 1, 3, 4 C All the above D None of the above
Question 93 Explanation:
The Saturn has 30 rings and 53confirmed natural satellites. The Saturn takes 10 hours 34 minutes to complete one rotation on its axis and it takes 29.4 years to complete one revolution around the sun.
 Question 94
Which of the following planet does not have rings around it?
 A Earth B Mars C Venus D Neptune
Question 94 Explanation:
All the gaseous planets in our solar system has ring around it.
 Question 95
Which of the following is not a major gas in Uranus
 A Hydrogen B Helium C Methane D Nitrogen
Question 95 Explanation:
Hydrogen, helium and methane are the major gases of its atmosphere. It is very cold due to its great distance from the sun.
 Question 96
Consider the following statements about Uranus
• Assertion (A): Uranus is named after the ancient Greek god of the sky. It has a dense atmosphere primarily consisting of methane.
• Reason (R): It has a dense atmosphere primarily consisting of methane.
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 96 Explanation:
Uranus is named after the ancient Greek god of the sky. It has a dense atmosphere primarily consisting of methane, which lends it a bluish-green appearance.
 Question 97
1. Uranus is visible to the naked eye.
2. Like Venus, Uranus also rotates on its axis from west to east.
3. Uranus is inclined on its axis at an angle of 96 degrees.
4. Uranus also has rings and twenty-six satellites.
 A 1, 2, 3 B 1, 4, 5 C 1, 2, 3, 4 D 1, 4, 3
Question 97 Explanation:
Uranus is the seventh planet from the sun and it is not visible to the naked eye. Like Venus, Uranus also rotates on its axis from east to west. Uranus is inclined on its axis at an angle of 98 degrees. The planet is almost lying on its side as it goes around the sun. The sunlight, thus, is received mostly in the polar areas. Uranus also has rings and twenty-seven satellites
 Question 98
Which planet in our solar system’s windiest planet?
 A Earth B Mars C Venus D Neptune
 Question 99
Consider the following statements about Neptune find the incorrect one
1. It is the second coldest planet in the Solar System.
2.  It is the farthest planet from the Sun.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 99 Explanation:
It is the coldest planet in the Solar System because it is the farthest planet from the Sun.
 Question 100
Find the correct statement about Neptune
 A It is the eighth planet from the sun. B It takes 18 hours to complete one rotation. C It takes nearly 155 years to revolve around the sun. D It has 15natural satellites, it has 3 rings
Question 100 Explanation:
Neptune is the eighth planet from the sun. It takes 16 hours to complete one rotation on its own axis and it takes nearly 165 years to revolve around the sun. It has 13 natural satellites and 5 rings
 Question 101
_____was the first planet located through mathematical calculations?
 A Earth B Mars C Venus D Neptune
 Question 102
North Pole of which planet experiences 21 years of night time in winter?
 A Earth B Mars C Venus D Uranus
Question 102 Explanation:
North Pole of the Uranus experiences 21 years of night time in winter, 21 years of daytime in summer and 42 years of day and night in the spring and fall.
 Question 103
The planet which does not have its own axis for rotation is called
 A Comets B Dwarf planets C Ringed planets D Jovian planets
Question 103 Explanation:
Dwarf planets are tiny planets in our solar system. Any celestial body orbiting around the sun, weighing for the gravity and nearly be round in shape is called ‘Dwarf Planet’
 Question 104
Consider the following statements and find the incorrect answer
1. Dwarf Planet should be a satellite of any planet.
2.  Pluto is officially demoted in 2005 from its ninth position as a planet.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 104 Explanation:
As Pluto has not cleared the neighborhood around its orbit, it is officially demoted in 2006 from its ninth position as a planet. ‘Dwarf Planet’ should not be a satellite of any planet.
 Question 105
Which is not the dwarf planet?
 A Ceres B Heumea C Makemake D Io
Question 105 Explanation:
Dwarf planets are five in number Ceres, Pluto, Heumea, Makemake and Eris. Io is the satellite of Jupiter.
 Question 106
Consider the following statements find the incorrect one
1. The word ‘Satellite’ means companion.
2.  The moon was the only known satellite in the Solar System until 1910.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 106 Explanation:
The word ‘Satellite’ means companion. The moon was the only known satellite in the Solar System until 1610. Today, there are 163 known satellites in the Solar System.
 Question 107
Find out the correct statement about satellite
 A The satellites move around a planet from east to west. B They do have own light and reflect it C They have no atmosphere and water. D Mercury has only one satellite.
Question 107 Explanation:
The satellites move around a planet from West to East. They do not have own light, but reflect the light of the Sun. They have no atmosphere and water. Mercury does not have any satellite.
 Question 108
Which planet can float on water?
 A Saturn B Pluto C Neptune D Uranus
Question 108 Explanation:
Saturn can float on water because its density is less than water.
 Question 109
The moon is the_____ largest natural satellite in the solar system?
 A Fourth B Second C Fifth D Sixth
 Question 110
Consider the following statements:
• Assertion (A): he observers on the earth could see only one side of the moon.
• Reason (R): The moon is located at a distance of 8, 84,401 km from the earth.
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 110 Explanation:
The moon is located at a distance of 8, 84,401 km from the earth. The moon revolves around the earth. The moon takes 27 days and 7 hours and 43 minutes for both its rotation and revolution around the earth. Hence, the observers on the earth could see only one side of the moon.
 Question 111
Consider the following statements about moon and find the correct statement
1. The moon was likely to be formed after a Mars sized body collided with Earth.
2.  The light which is reflected by the Moon will reach the Earth in just one and a quarter seconds.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 111 Explanation:
The moon was likely to be formed after a Mars sized body collided with Earth. There are many craters, high and steep mountains of different sizes which cast shadows on the Moon’s surface. The light which is reflected by the Moon will reach the Earth in just one and a quarter seconds.
 Question 112
1.  Apollo 11 was the first manned mission to land on the Moon
2.  It was sent by NASA.
3.  Two American Astronauts Neil Armstrong and Edwin Aldrin set foot on the moon’s surface.
 A 1, 2 B 1, 3 C 2, 3 D 1, 2, 3
Question 112 Explanation:
Apollo 11 was the first manned mission to land on the Moon sent by NASA. Two American Astronauts Neil Armstrong and Edwin Aldrin set foot on the moon’s surface on the waterless Sea of Tranquility on 20th July, 1969. They stayed there for 21 hours 38 minutes and 21 seconds on the moon. Michael Collins piloted Apollo 11.
 Question 113
Man weighs ______ times less on the moon than the earth?
 A 5 times B 6 times C 7 times D 8 times
Question 113 Explanation:
The moon is smaller than the earth, it has 1/6 of the gravitational pull of the earth. So, man weighs 6 times less on the moon than the earth.
 Question 114
Consider the following statements find the incorrect one
1.  Asteroids are larger rocky celestial bodies that revolve around the Sun.
2.  Asteroid are also called ‘Major Planets’.
3.  Larger asteroids are called Comets.
 A 3 only B 2, 3 C 1, 3 D 1, 2, 3
Question 114 Explanation:
Asteroids are small rocky celestial bodies that revolve around the Sun, like other planets. They are also called ‘Minor Planets’. There are lots of asteroids in the solar system. Larger asteroids are called Planetoid
 Question 115
Asteroids are found in between the planets of________?
 A Mars and Jupiter B Mars and Earth C Mars and Venus D Jupiter and Saturn
Question 115 Explanation:
Asteroids are found in between the planets Mars and Jupiter. This belt is known as ‘Asteroid belt’. The diameter of the asteroids varies from 100 km to a size of a pebble. The asteroids may be the fragments of a planet exploded in the past or some parts of comets.
 Question 116
 A The word Comet is derived from the Latin word Aster Kometes. B Comets means ‘Long Haired Star’ C They are made up of small rocks D They revolve around the Sun in regular orbit.
Question 116 Explanation:
The word Comet is derived from the Greek word Aster Kometes meaning ‘Long Haired Star’. They are made up of small ice particles and meteoric fragments. They revolve around the Sun. But their orbits are irregular.
 Question 117
Consider the statements find the incorrect statement
1. Comets get very close to the sun is called Aphelion.
2. Comets go far away from the sun is called Perihelion.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 117 Explanation:
Comets get very close to the sun is called perihelion. Comets go far away from the sun is called aphelion.
 Question 118
The best known Comet, Halley’s Comet, appears once in every ____ years?
 A 75 B 74 C 73 D 76
Question 118 Explanation:
The best known Comet, Halley’s Comet, appears once in every 76 years. The Halley’s Comet was seen last in 1986 and it will be seen again on 28th July 2061.
 Question 119
Consider the following statements and find the correct answer
1. It is the only moon with clouds and atmosphere.
2. It is Saturn’s largest moon
3. It is the second largest moon in the solar system
 A Triton B Tethys C Titania D Titan
Question 119 Explanation:
Titan – only moon with clouds and atmosphere. Titan is Saturn’s largest moon and the second largest (after Ganymede of Jupiter) in the solar system
 Question 120
Titan was discovered by?
 A William Hubble B W. C. Pant C Christiaan Huygens D Anaximander
Question 120 Explanation:
Titan was discovered by Dutch astronomer Christiaan Huygens in 1655. The Huygens lander probe sent to the moon aboard NASA’s Cassini spacecraft by the European Space Agency is named in his honor. Huygens was the first human-built object to land on Titan’s surface.
 Question 121
Find out incorrect statement about titan
1. Diameter of titan is 5,150 kilometers.
2.  Surface temperature of titan is -179 degrees Celsius.
3.  Surface pressure is slightly higher than Earth’s pressure.
 A 1, 2 B 2, 3 C All the above D None of the above
Question 121 Explanation:
Titan’s surface diameter: 5,150 kilometers, about half the size of Earth and almost as large as Mars. Surface temperature: - 179 degrees Celsius, which makes water as hard as rocks and allows methane to be found in its liquid form. Surface pressure: Slightly higher than Earth’s pressure.
 Question 122
Consider the following statements find the incorrect one
 A Earth’s pressure at sea level is 1 bars B Titan’s pressure at sea level is 1.6 bars. C Titan’s mass is composed mainly of water D Titan has magnetic field.
Question 122 Explanation:
Earth’s pressure at sea level is 1 bar while Titan’s is 1.6 bars. Orbital period of titan is 15,945 days. Titan’s mass is composed mainly of water in the form of ice and rocky material. Titan has no magnetic field.
 Question 123
‘Shooting stars’ are the removed pieces of rocks mainly from____?
 A Kuiper belt B Asteroid belt C Oort cloud D Nebula
Question 123 Explanation:
Asteroid is a bright streak of light flashing seen often in the sky during night for a few seconds. They are called as ‘shooting stars’. They are the removed pieces of rocks mainly from the Asteroid belt.
 Question 124
Consider the following statements, find the correct statements
1. Asteroids are called Meteors before they enter into our atmosphere.
2.  After entering into our atmosphere they are called as Meteorites
3. The large unburned pieces of rocks that fall on the earth are called Meteoroids.
 A 1, 2 B 1, 3 C All the above D None of the above
Question 124 Explanation:
Asteroids are called Meteoroids before they enter into our atmosphere. They enter into the atmosphere with great speed. But most of them are burnt when they enter into the atmosphere. After entering into our atmosphere they are called as Meteors. Some pieces do not burn fully and they fall on the earth and make craters. The large unburned pieces of rocks that fall on the earth are called Meteorites.
 Question 125
Consider the following statements find the incorrect one
1. Meteoroids are called as ‘shooting stars’.
2.  Meteor crater in Southern Arizona.
3.  Lake Lonar in Buldhana District
 A 1, 2 B 1, 3 C All the above D None of the above
Question 125 Explanation:
Examples for Meteorite Fall: Meteor crater in Northern Arizona and Lake Lonar in Buldhana District of Maharastra in India were created by meteor impacts.
 Question 126
Which of the following is propounded by Anaximander
 A Cylindrical earth was surrounded by celestial sphere. B Spherical earth was surrounded by celestial sphere C Elliptical earth was surrounded by celestial sphere. D Spiral earth was surrounded by celestial sphere
Question 126 Explanation:
Anaximander (600 B.C) proposed that cylindrical earth was surrounded by celestial sphere.
 Question 127
Who said that the Earth was a sphere, which was considered the most harmonious geometric shape
 A Anaximander B Aristotle C Pythagoras D Hubble
Question 127 Explanation:
Pythagoras (582-507 B.C.) believed that the Earth was a sphere, which was considered the most harmonious geometric shape.
 Question 128
Consider the following statements find the correct answer
1.  Aristotle described observations that supported the theory that the Earth was a sphere.
2.  Eratosthenes estimated size of earth
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 128 Explanation:
Aristotle (384-322 B.C.) described observations that supported the theory that the Earth was a sphere. These included the fact that the shadow of the moon is circular in lunar eclipses and constellations were higher in the sky as one traveled south. Eratosthenes (275-195 BCE) estimated size of earth from observations that the elevation of the sun varied with position on the Earth’s surface in Egypt.
 Question 129
Which observations of the following suggested that the Earth is a sphere?
1. Mountain peaks lit by the Sun after sunset.
2. Ships disappear below the horizon as they sail across ocean.
3. The moon looks like an arc.
4. The Earth casts an elliptical shadow during lunar eclipses.
 A 1, 2, 3 B 1, 2 C 2, 3, 4 D 1, 2, 3, 4
Question 129 Explanation:
Observations of the following suggested that the Earth is a sphere.1. Mountain peaks lit by the Sun after sunset. 2. Ships disappear below the horizon as they sail across ocean. 3. The moon looks like a disc.4. The Earth casts a circular shadow during lunar eclipses.
 Question 130
Consider the following statements and find the incorrect one
1.  The bulge at the equator is caused by the centrifugal force of the Earth’s rotation.
2.  The gravitational pull of the earth is the weaker at the flattened poles & stronger towards the equator
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 130 Explanation:
The Earth is an oblate spheroid, bulged at the equator and flattened at the poles. It is called ‘Geoid’ meaning the earth is earth-shaped. The bulge at the equator is caused by the centrifugal force of the Earth’s rotation. The gravitational pull of the earth is the strongest at the flattened poles and it is weaker towards the equator
 Question 131
What will happen if the Earth would not have been tilted on its axis?
 A Same duration of days and nights B Days will be longer than nights C Nights will be longer than days D No changes
Question 131 Explanation:
The Sun’s gravitational pull differs in force at the poles. The North Pole points in the same direction to the North Star when it revolves about the Sun. If the Earth would not have been tilted on its axis, the days and nights would have been of same duration always.
 Question 132
What is galactic movement?
 A Planets revolving in an orbit around the sun B Satellites revolving in an orbit around their planets C Movement of solar system in an orbit around the center of the Milky Way Galaxy D None of the above
Question 132 Explanation:
Galactic movement: This is the movement of the earth with the sun and the rest of the solar system in an orbit around the center of the Milky Way Galaxy. This, however, has little effect upon the changing environment of the earth.
 Question 133
Find out the correct statement
 A The spinning of the earth around its axis is called the revolution of the earth. B The axis is the imaginary line passing through the center of the earth C The earth completes one revolution in 23 hours, 56 minutes and 4.09 seconds. D It rotates in an westward direction opposite to the apparent movement of the sun
Question 133 Explanation:
The spinning of the earth around its axis is called the rotation of the earth. The axis is the imaginary line passing through the center of the earth. The earth completes one rotation in 23 hours, 56 minutes and 4.09 seconds. It rotates in an eastward direction opposite to the apparent movement of the sun
 Question 134
Find out the incorrect statements
1.  The earth’s axis is inclined at an angle of 66½ degree to the orbital plane.
2.  The earth’s axis is tilted at an angle of 23½ degree from a perpendicular to the spherical plane
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 134 Explanation:
The earth’s axis is inclined at an angle of 66½ degree to the orbital plane as it moves around the sun. We can say, the earth’s axis is tilted at an angle of 23½ degree from a perpendicular to the elliptic plane.
 Question 135
Consider the following statements about earth and find the incorrect statement
 A The velocity of earth’s rotation varies. B Rotational velocity at the poles is nearly zero. C The greatest velocity of the rotation is found at the equator. D The velocity of rotation at the equator is 1,170 km per hour.
Question 135 Explanation:
The velocity of rotation at the equator is 1,670 km per hour.
 Question 136
The rotation of the earth causes which the following effects?
1. Alternate occurrence of day and night
2. Difference in time between different places on the earth
3. Deflection of the winds
4. The sun, moon, planets and stars appear to rise in the east and set in the west.
 A 1, 2, 3 B 1, 3, 4 C 1, 2, 4 D 1, 2, 3, 4
Question 136 Explanation:
Effects of earth’s rotation: The rotation of the earth causes the following effects: The apparent rising and setting of the sun is actually caused by the earth’s rotation which results in the alternate occurrence of day and night everywhere on the earth’s surface. Rotation of the earth is also responsible for the difference in time between different places on the earth. When you observe through a moving train, trees, houses and fields on the other side of the track appear to move in the direction opposite to that of the speeding train. The apparent movement of the sun and the other heavenly bodies in relation to the rotating earth is similar. As the earth rotates from west to east, the sun, moon, planets and stars appear to rise in the east and set in the west. Rotation causes the working of the Coriolis force which results in the deflection of the winds and the ocean currents from their normal path. Tide is caused by the rotation of the earth apart from the gravitational pull of the sun and the moon.
 Question 137
Difference of ___minutes for every degree of longitude that passes the sun?
 A 4 minutes B 3 minutes C 4.6 minutes D 5 minutes
Question 137 Explanation:
Rotation of the earth is also responsible for the difference in time between different places on the earth. A 24 hour period divided by 360 degrees gives a difference of 4 minutes for every degree of longitude that passes the sun. The hour (60 minutes) is thus 1/24 of a day.
 Question 138
The line around the earth separating the light and dark is known as?
 A Latitude B Longitude C Illumination D Circle of illumination
Question 138 Explanation:
The line around the earth separating the light and dark is known as the circle of illumination It passes through the poles and allows the entire earth to have an equal amount of time during the daylight and night time hours. This line can be seen from space, and the exact location of the line is dependent on the various seasons.
 Question 139
Consider the following statements
• Assertion (A): About January 3rd the earth is closest to the sun and it is said to be at Perihelion
• Reason (R): ‘Peri’ means close to and Helios means sun
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 139 Explanation:
The distance of the earth from sun varies time to time due to the elliptical shape of the orbit. About January 3rd the earth is closest to the sun and it is said to be at Perihelion (‘peri’ means close to and Helios means sun). At Perihelion, the distance is 147 million km.
 Question 140
Consider the following statements, choose the correct statements
1.  Around July 6th the earth is farthest from the sun and it is said to be at.
2.  At Aphelion the distance of the earth is 156 million km away from the sun.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 140 Explanation:
Around July 4th the earth is farthest from the sun and it is said to be at Aphelion (Ap means away and Helios means sun). At Aphelion the distance of the earth is 152 million km away from the sun.
 Question 141
Find the correct statements
1. The movement of the earth in its orbit around the sun in a clockwise direction.
2. The period taken by the earth for one revolution around the sun is 365 days 365¼ days.
3. The speed of the revolution is 107000 km per hour.
4. The speed is 40 km per second.
 A 1, 4 B 2, 3 C All the above D None of the above
Question 141 Explanation:
The movement of the earth in its orbit around the sun in an anti-clockwise direction, that is, from west to east is called revolution of the earth. The period taken by the earth to complete one revolution around the sun is 365 days and 6 hours (5 hours, 48 minutes and 45 seconds) or 365¼ days. The speed of the revolution is 107000 km per hour. The speed is 30 km per second. The bullet from a gun travels with a speed of 9 km per second.
 Question 142
Which is known as “Morning star and Evening star”?
 A Mars B Venus C Jupiter D Saturn
 Question 143
Consider the following statements:
• Assertion (A): The month of February which has 29 days in a leap year.
• Reason (R): To keep our yearly calendars consistent with our orbit around the Sun once in, every four years we add one day
 A Both (A) and (R) are true and (R) is the correct explanation of (A) B Both (A) and (R) are true but (R) is not the correct explanation of (A) C (A) is true but (R) is false D (A) is false but (R) is true
Question 143 Explanation:
Earth takes 365.25 days to complete one trip around the Sun .That extra quarter of a day presents a challenge to our calendar system, which has one year as 365 days. To keep our yearly calendars consistent with our orbit around the Sun once in, every four years we add one day. The extra day added to is called a leap day, and the year the extra day is added to is called a leap year. The extra day is added to the month of February which has 29 days in a leap year.
 Question 144
What are the effects of revolution of the earth?
1. Cycle of seasons
2. Variation in length of days and nights
3. Variation in distribution of solar energy over the earth and the temperature zones
 A 1, 2,3 B 2, 3 C All the above D None of the above
 Question 145
Consider the following statements find the incorrect answer
1. The seasons are caused due to the earth’s revolution
2. The seasons are caused due to the tilt of its axis in the same direction throughout the year.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 145 Explanation:
The seasons are caused due to the combined effect of the earth’s revolution and the tilt of its axis in the same direction throughout the year. In general, spring, summer, autumn and winter are the four seasons.
 Question 146
Find out the correct statement
 A The sun appears to follow a yearly pattern of eastward and southward motion in the sky, known as the ‘apparent movement of the sun B The sun appears to follow a yearly pattern of northward and westward motion in the sky, known as the ‘apparent movement of the sun C The sun appears to follow a yearly pattern of northward and southward motion in the sky, known as the ‘apparent movement of the sun D The sun appears to follow a yearly pattern of northward and westward motion in the sky, known as the ‘apparent movement of the sun
Question 146 Explanation:
The sun appears to follow a yearly pattern of northward and southward motion in the sky, known as the ‘apparent movement of the sun’. It gives an impression that the sun is continuously swinging north and south of the equator. Actually it is the earth that is moving around the sun on its tilted axis. It varies when observed on a daily and monthly basis, at different times of the year.
 Question 147
On which day the sun rises precisely in the east and sets exactly in the west?
1. 21 March
2. 22 September
3. 24 March
4. 23 September
 A 1, 4 B 2, 3 C All the above D None of the above
Question 147 Explanation:
The earth that is moving around the sun on its tilted axis. It varies when observed on a daily and monthly basis, at different times of the year. On 21 March and 23 September the sun rises precisely in the east and sets exactly in the west.
 Question 148
Match the following
1. Autumnal equinox              - 1. June 21
2. Summer solstice                  - 2. March 21
3. Spring equinox                    - 3. December 22
4. Winter solstice                     - 4. September 23
 A 4, 1, 2, 3 B 4, 1, 3, 2 C 1, 4, 2, 3 D 1, 4, 3, 2
 Question 149
 A The North Pole is inclined or tilted towards the sun B The North Pole experiences complete dark for 24 hours. C The rays of the sun fall vertically at the tropic of Capricorn (23½º S). D The day 22 June is known as summer solstice
Question 149 Explanation:
The North Pole is inclined or tilted towards the sun. It, therefore, experiences complete light for 24 hours. The South Pole is tilted away from the sun so it is in complete darkness for 24 hours. The rays of the sun fall vertically at the tropic of cancer (23½º N). In the Northern hemisphere, the days are longer than the nights. It is summer in the northern hemisphere and winter in the southern hemisphere. The day 21 June is known as summer solstice.
 Question 150
1. The southern hemisphere has winter.
2. The northern hemisphere has summer.
3. The day 22 December is winter solstice
4. In the northern hemisphere the nights are longer than the days at this time
 A 1, 2 B 2, 3 C All the above D None of the above
Question 150 Explanation:
The South Pole is inclined towards the sun and the North Pole is away from it. The rays of the sun fall vertically at the tropic of Capricorn (23½º S). The greater part of the southern hemisphere gets the direct rays of the sun so the days are long and the nights are short here. In the northern hemisphere the nights are longer than the days at this time. The southern hemisphere has summer. The northern hemisphere has winter. This day (22 December), when the sun’s rays fall vertically on the Tropic of Capricorn, is known as winter solstice.
 Question 151
Consider the statements, find the correct answer
• Neither pole is inclined towards the sun.
• The rays of the sun fall vertically on the equator.
• All the places have equal days and nights as both the poles receive the rays of the sun.
• It is spring in the northern hemisphere and autumn in the southern hemisphere.
• This day is known as spring equinox.
 A 22 March B 21 March C 22 September D 23 September
Question 151 Explanation:
Neither pole is inclined towards the sun. The rays of the sun fall vertically on the equator. All the places have equal days and nights as both the poles receive the rays of the sun. It is spring in the northern hemisphere and autumn in the southern hemisphere. This day (21 March) is known as spring equinox.
 Question 152
Consider the statements, find the correct answer
• The rays of the sun fall vertically on the equator.
• All the places have equal days and nights.
• It is autumn in the northern hemisphere and spring in the southern hemisphere.
• This day (23 September) when sun’s rays for fall vertically on the equator
 A Summer solstice B Winter solstice C Autumn equinox D Spring equinox
Question 152 Explanation:
Position of the earth on 23 September. Neither pole of the earth is inclined towards the sun. The rays of the sun fall vertically on the equator. All the places have equal days and nights. It is autumn in the northern hemisphere and spring in the southern hemisphere. This day (23 September) when sun’s rays for fall vertically on the equator, is known as autumnal equinox.
 Question 153
Which is a complete or partial obscuration of light from a celestial body?
 A Comets B Clouds C Eclipse D Galaxy
Question 153 Explanation:
An eclipse is a complete or partial obscuration of light from a celestial body and it passes through the shadow of another celestial body.
 Question 154
Find out the correct statement about solar eclipse?
1.  It occurs on New Moon days, when the sun is between the Moon and the Earth.
2.  It can be seen from all part of the world
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 154 Explanation:
It occurs on New Moon days, when the moon is between the Sun and the Earth. Thus it obscures a part of the Sun viewed from the Earth, but only from a small area of the world.
 Question 155
Find out the incorrectly matched pair
1.  Partial solar eclipse           - Moon partially covers the disc of the sun.
2.  Annular solar eclipse        - Moon passes centrally across the solar disc.
3.  Total solar eclipse            - Moon’s shadow is short enough to cover the whole sun.
 A 1, 2 B 2, 3 C All the above D None of the above
Question 155 Explanation:
A partial solar eclipse happens when the moon partially covers the disc of the sun. An annular solar eclipse occurs when the moon passes centrally across the solar disc. During a total solar eclipse, the moon’s shadow is short enough to cover the whole sun.
 Question 156
Which is called as diamond ring?
 A Annular solar eclipse B Partial solar eclipse C Total solar eclipse D None of the above
Question 156 Explanation:
During a total solar eclipse, the moon’s shadow is short enough to cover the whole sun. The outer regions still glow and look bright as a ring. Such a phenomenon is called Diamond Ring.
 Question 157
Find out the correct statement about lunar eclipse
1.  It last for a full day
2.  The earth’s shadow obscures the moon as viewed from the earth
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 157 Explanation:
The earth’s shadow obscures the moon as viewed from the earth. Lunar eclipse can be seen from anywhere on the night side of the Earth. It lasts for a few hours due to the smaller size of the moon.
 Question 158
Find the incorrect statement
1.  Partial lunar eclipse is when only a part of the moon’s surface is obscured by earth’s umbra.
2.  Total lunar eclipse occurs happens when the moon travels through the faint penumbral portion of the earth’s shadow.
3.  Penumbral lunar eclipse occurs when the earth umbra obscures the entire the moon’s surface
 A 1, 2 only B 2, 3 only C All the above D None of the above
Question 158 Explanation:
A partial lunar eclipse can be observed when only a part of the moon’s surface is obscured by earth’s umbra. A penumbral lunar eclipse happens when the moon travels through the faint penumbral portion of the earth’s shadow. A total lunar eclipse occurs when the earth umbra obscures the entire the moon’s surface. Lunar eclipse can be seen from anywhere on the night side of the Earth. It lasts for a few hours due to the smaller size of the moon.
 Question 159
When lunar eclipse occurs?
 A Full moon day B New moon day C Partial moon day D All the above
Question 159 Explanation:
It occurs on a Full Moon position when the earth is between the sun and the moon.
 Question 160
Find out the correct statement
1.  Spinning of the earth from east to west on its axis is called rotation
2.  Movement of the earth around the sun in spherical orbit is called as revolution
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
 Question 161
Find out the incorrect statement about phases of the moon
1. Phases of the moon start from the ‘New Moon’ every month.
2. Only a part of the Moon is seen bright called ‘Gibbous’, which develops into the ‘first quarter’.
3. With the increasing brightness gibbous turns into three quarters known as ‘Crescent’.
4. Then crescent becomes a ‘Full Moon’.
 A 1, 2 ,3 B 2, 3 ,4 C All the above D None of the above
Question 161 Explanation:
The changing angles between the earth, the sun and the moon determine the phases of the moon. Phases of the moon start from the ‘New Moon’ every month. Then, only a part of the Moon is seen bright called ‘Crescent’, which develops into the ‘first quarter’. With the increasing brightness it turns into three quarters known as ‘Gibbous’ and then it becomes a ‘Full Moon’. These stages are the waxing moon. After the full moon, the moon starts waning or receding through the stages of Gibbous, last quarter, crescent, and finally becomes invisible as dark New Moon.
 Question 162
The seasonal variations in the duration of daylight are maximum at?
 A Equator B Polar C Tropic of cancer D Tropic of Capricorn
Question 162 Explanation:
As one moves away from the equator, the seasonal variations in the duration of daylight increase. The seasonal variations in the duration of daylight are maximum at the polar region.
 Question 163
Which of the following is the effects of the spherical shape of the earth?
2.  Difference in the angle of the sun’s rays striking different parts of the earth.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
 Question 164
Find out the incorrect statements
1.  As we move north or south of latitudes, the sun’s rays strike at increasing angles.
2.  On any given day only the places located at particular latitude receive perpendicular rays from the sun
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 164 Explanation:
If the earth were a flat surface, oriented at right angle to the sun, all the places on the earth would have received the same amount of radiation. But the earth is spherical/ geoid. Hence the sunrays do not heat the higher latitudes of the earth as much as the tropics. On any given day only the places located at particular latitude receive vertical rays from the sun. As we move north or south of this location, the sun’s rays strike at decreasing angles. The yearly fluctuations in the angle of the sun’s rays and the length of the days change with the continual change of the earth’s position in its orbit around the sun at an inclination of 66½ to the orbital plane.
 Question 165
The world has been divided into _________ distinct heat zones?
 A 3 B 4 C 2 D 5
Question 165 Explanation:
As a result, the world has been divided into three distinct heat zones or temperature zones. They are the Torrid Zone, Temperate Zone and Frigid Zone. The spherical shape of the earth along with its movement around the sun causes differences in the angles at which the sun rays fall on the earth’s surface. This causes a difference in the distribution of heat on the earth’s surface.
 Question 166
Find out the incorrect statement
1.  In 15th century, the people started using pendulum clock.
2.  Later chronometer was invented in 1664.
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 166 Explanation:
People during the medieval period were using sundials and water clocks to observe the Sun’s meridian passing at noon. In 17century, the people started using pendulum clock which did not show accurate time while travelling in the sea. Later chronometer was invented in 1764. Chronometer measures time accurately and the mariners widely used this during the 19th century. But in many towns and cities clocks were set based on sunset and sunrise.
 Question 167
Earth was divided into how many time zones?
 A 22 B 24 C 23 D 25
Question 167 Explanation:
The world time zone was formed, relating longitude and the rotation of the earth. The Prime Meridian is the center of time zone extending from 7½ºW and 7½ º E longitudes. The 24 hour time zone system had been developed so that all the time zones should be referred with respect to Greenwich Mean Time. Earth was divided into 24 time zones, each one zone for one hour of the day. It is because earth rotates 15º of longitude in one hour (360º divided by 24 hours). The time when solar noon occurs at the Prime Meridian is fixed as noon for all places between 7½º E and 7½º W.
 Question 168
‘The Daylight Saving Time’ (DST) countries are?
1. Europe
2. North America
3. Australia
4. South America
5. Asia
 A 1, 2, 3, 4, 5 B 2, 3, 4, 5 C 1, 3, 4, 5 D 1, 2, 3, 4
Question 168 Explanation:
In the mid latitude countries of Europe, North America, Australia and South America, the day time are longer in summer than the night. In spite of employing daylight duration, the clocks are adjusted 1 hour forward in spring and 1 hour backward in autumn. This time is generally known as ‘the Daylight Saving Time’ (DST).
 Question 169
Find the correct statements about latitudes
1.  Latitude lines are drawn east – west.
2.  They measure the location in northern and southern hemisphere.
3.  The line starts at the equator and measure distance from 0 degrees to 90 degrees north and also 0 degrees to 90 degrees south.
4. They also become shorter farther away from the equator.
 A 1, 2 ,3 B 1,2, 3 ,4 C All the above D None of the above
 Question 170
Find the incorrect statement about longitude
 A Longitude lines are drawn north – south B They measure eastern and western hemisphere. C They start at the Prime Meridian and measure from 0 degrees to 180 degrees south and 180 degrees north D Unlike lines of latitude, these lines are fairly equal in length.
Question 170 Explanation:
They start at the Prime Meridian (or 0 degree) and measure from 0 degrees to 180 degrees east and 180 degrees west. Unlike lines of latitude, these lines are fairly equal in length.
 Question 171
The intersection of 0 degree latitude and 0 degree longitude at
 A Atlantic ocean B Arctic ocean C Pacific ocean D Southern ocean
Question 171 Explanation:
Unlike lines of latitude, these lines are fairly equal in length. The origin of this spherical coordinate system is at 0 degree latitude and 0 degree longitude. This spot can be found in the Atlantic Ocean just south west of Africa. Also, the two lines connect at 180 degrees or at the International Date Line. This too helps to determining different time zones of the world.
 Question 172
International Date Line is placed exactly on?
 A Atlantic ocean B Arctic ocean C Pacific ocean D Southern ocean
 Question 173
Third quarter of moon’s phase is known as_______?
 A Gibbous B Penumbra C Crescent D None of the above
 Question 174
Find out the incorrect statement
1.  An electric storm on the sun and releases huge amounts of gases is called solar flare
2.  The explosive born of a star is called super nova
 A 1 only B 2 only C Both 1& 2 D Neither 1 nor 2
Question 174 Explanation:
Solar flare is a magnetic storm on the sun and releases huge amounts of gases. It can cause ‘Sun quakes’. Super Nova is the explosive death of a star. It obtains brightness of 100 million suns for a short time.
 Question 175
Match the following        Planet                    Rotation
1. Mars                       -  a) 9 hours 55 minutes
2. Jupiter                    - b) 24 hours 37 minutes
3. Saturn                    - c) 16 hours
4. Neptune                 - d) 10 hours 34 minutes
 A b, a, d, c B b, a, c, d C a, b, c, d D a, d, d, c
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