# Thermal Physics Online Test 10th Science Lesson 3 Questions in English

## Thermal Physics Online Test 10th Science Lesson 3 Questions in English

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 Question 1
Which of the following statement is correct?
1. Sun is the primary source of thermal energy for all living organisms.
2. Thermal energy is the effect, and temperature is the cause.
 A 1 alone B 2 alone C 1, 2 D None
Question 1 Explanation:
Sun is the primary source of thermal energy for all living organisms. Thermal energy is the cause, and temperature is the effect. All living organisms need a particular temperature for their survival.
 Question 2
• Assertion(A): Temperature can be defined as the property which determines whether a body is in equilibrium or not with the surroundings
• Reason(R): Temperature is defined as the degree of hotness of a body.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 2 Explanation:
Temperature is defined as the degree of hotness of a body. The temperature is higher for a hotter body than for a colder body. It is also be defined as the property which determines whether a body is in equilibrium or not with the surroundings.
 Question 3
What is the SI unit of temperature?
 A degree Celsius B degree Fahrenheit C Kelvin D All the above
Question 3 Explanation:
Temperature is the property, which determines the direction of flow of heat. It is a scalar quantity. The SI unit of temperature is kelvin (K). There are other commonly used units of temperature such as degree Celsius (°C) and degree Fahrenheit (°F).
 Question 4
The temperature measured in relation to absolute zero using the kelvin scale is known as_______
 A Dynamic temperature B Absolute temperature C Normal temperature D None
Question 4 Explanation:
The temperature measured in relation to absolute zero using the kelvin scale is known as absolute temperature. It is also known as the thermodynamic temperature.
 Question 5
A temperature difference of 1°C is equal to that of_________ K
 A 273 B 1 C 10 D 1/273
Question 5 Explanation:
Each unit of the thermodynamic scale of temperature is defined as the fraction of 1/273.16th part of the thermodynamic temperature of the triple point of water. A temperature difference of 1°C is equal to that of 1K. Zero Kelvin is the absolute scale of temperature of the body.
 Question 6
0K =
 A –273°C B 273°C C 1°C D 2C
Question 6 Explanation:
The relation between the different types of scale of temperature: Celsius and Kelvin: K=C+ 273, Fahrenheit and Kelvin: [K] = (F + 460) × 5 /9 0K = –273°C.
 Question 7
Two or more physical systems or bodies are said to be in thermal equilibrium if____
 A There is no net flow of thermal energy between the systems B There is net flow of thermal energy between the system C There is partial flow of thermal energy between the system D None
Question 7 Explanation:
Two or more physical systems or bodies are said to be in thermal equilibrium if there is no net flow of thermal energy between the systems. Heat energy always flows from one body to the other due to a temperature difference between them.
 Question 8
What will happen if two bodies at different temperatures are brought in contact with one other?
 A There will be a transfer of heat energy from the hot body to the cold body B There will be a transfer of heat energy from the cold body to the hot body C Hot body will be hot and the cold body will be cold D None
Question 8 Explanation:
There will be a transfer of heat energy from the hot body to the cold body until a thermal equilibrium is established between them. If two bodies are said to be in thermal equilibrium, then, they will be at the same temperature. When a cold body is placed in contact with a hot body, some thermal energy is transferred from the hot body to the cold body. As a result, there is some rise in the temperature of the cold body and decrease in the temperature of the hot body. This process will continue until these two bodies attain the same temperature.
 Question 9
• Assertion(A): If you leave a cup of hot milk on a table for some time, the hotness of the milk   decreases after some time.
• Reason(R): There is a flow of energy from the cup of milk to the environment.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 9 Explanation:
If you leave a cup of hot milk on a table for some time, what happens? The hotness of the milk decreases after some time. Similarly, if you keep a bottle of cold water on a table, the water becomes warmer after some time. What do you infer from these observations? In the case of hot milk, there is a flow of energy from the cup of milk to the environment. In the second case, the energy is transferred from the environment to the water bottle. This energy is termed as “thermal energy”.
 Question 10
Which of the following statement is correct?
1. When a hot object is in contact with another cold object, a form of energy flows from the hot object to the cold object
2. This energy is known as thermal energy
3. Thermal energy is also known as 'heat energy' or simply 'heat'.
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 10 Explanation:
When a hot object is in contact with another cold object, a form of energy flows from the hot object to the cold object, which is known as thermal energy. Thus, thermal energy is a form of energy which is transferred between any two bodies due to the difference in their temperatures. Thermal energy is also known as 'heat energy' or simply 'heat'.
 Question 11
By which of the following process of transmission of heat takes place?
1. Convection
2. Conduction
3. Radiation
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 11 Explanation:
Heat energy is the agent, which produces the sensation of warmth and makes bodies hot. Process of transmission of heat may be done in any of the ways like conduction, convection or radiation.
 Question 12
What is the unit of heat energy?
 A Joule B Kelvin C Degree centigrade D Joule/ Kelvin
Question 12 Explanation:
The process in which heat energy flows from a body at a higher temperature to another object at lower temperature is known as heating. Heat is a scalar quantity. The SI unit of heat energy absorbed or evolved is joule (J).
 Question 13
Which of the following statement is incorrect?
1. During the process of transferring heat energy, the body at lower temperature is heated while the body at higher temperature is cooled.
2. When the thermal energy is transferred from one body to another, this results in the rise or lowering of the temperature of either of the bodies.
 A 1 alone B 2 alone C 1, 2 D None
Question 13 Explanation:
During the process of transferring heat energy, the body at lower temperature is heated while the body at higher temperature is cooled. Thus, sometimes, this process of transfer of heat energy is termed as 'cooling'. But, in most of the cases the term 'heating' is used instead of 'cooling'. When the thermal energy is transferred from one body to another, this results in the rise or lowering of the temperature of either of the bodies.
 Question 14
Which of the following are the Characteristic features of heat energy transfer?
1. Heat always flows from a system at higher temperature to a system at lower temperature.
2. The mass of a system is altered when it is heated or cooled.
3. Heat gained = Heat lost
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 14 Explanation:
Characteristic features of heat energy transfer: Heat always flows from a system at higher temperature to a system at lower temperature. The mass of a system is not altered when it is heated or cooled. For any exchange of heat, the heat gained by the cold system is equal to heat lost by the hot system. Heat gained = Heat lost.
 Question 15
Which of the following statement is incorrect?
1. Though the SI unit of heat energy is joule, there are some other commonly used units such as Calorie
2. One kilocalorie is defined as the amount of heat energy required to rise the temperature of 1 gram of water through 1°C
 A 1 alone B 2 alone C 1, 2 D None
Question 15 Explanation:
Though the SI unit of heat energy is joule, there are some other commonly used units: Calorie: One calorie is defined as the amount of heat energy required to rise the temperature of 1 gram of water through 1°C. Kilocalorie: One kilocalorie is defined as the amount of heat energy required to rise the temperature of 1 kilogram of water through 1°C.
 Question 16
Which of the following are the effects of heat energy in a substance?
1. Temperature of the substance rises
2. The substance will expand when heated
3. The substance may change its state from solid to liquid or from liquid to gas
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 16 Explanation:
When a certain amount of heat energy is given to a substance, it will undergo one or more of the following changes: Temperature of the substance rises The substance may change its state from solid to liquid or from liquid to gas The substance will expand when heated.
 Question 17
Which of the following statement is correct?
1. The rise in temperature is in proportion to the amount of heat energy supplied.
2. It also depends on the nature of the substance alone

 A 1 alone B 2 alone C 1, 2 D None
Question 17 Explanation:
The rise in temperature is in proportion to the amount of heat energy supplied. It also depends on the nature and mass of the substance.
 Question 18
• Assertion(A): The expansion of liquids (e. g. mercury) can be seen when a thermometer is placed in warm water
• Reason(R): When heat energy is supplied to a body, there can be an increase in the dimension of  the object.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 18 Explanation:
When heat energy is supplied to a body, there can be an increase in the dimension of the object. The expansion of liquids (e. g. mercury) can be seen when a thermometer is placed in warm water.
 Question 19
Which of the following matter undergo thermal expansion?
1. Liquid
2. Gas
3. Solid
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 19 Explanation:
The change in the dimension due to rise in temperature is called thermal expansion of the object. All forms of matter (solid, liquid and gas) undergo expansion on heating.
 Question 20
• Assertion(A): For a given change in temperature, the extent of expansion is more in solids than  in liquids and gases.
• Reason(R): When a solid is heated, the atoms gain energy and vibrate more vigorously.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is wrong and (R) is correct
Question 20 Explanation:
When a solid is heated, the atoms gain energy and vibrate more vigorously. This results in the expansion of the solid. For a given change in temperature, the extent of expansion is smaller in solids than in liquids and gases. This is due to the rigid nature of solids.
 Question 21
Which of the following are the types of expansion of solid?
1. Ultrasonic expansion
2. Linear expansion
3. Superficial expansion
4. Cubical expansion
 A 1, 2, 4 B 2, 3, 4 C 1, 3, 4 D All the above
Question 21 Explanation:
The different types of expansion of solid are listed and explained below: Linear expansion Superficial expansion Cubical expansion
 Question 22
The change in length of a body due to heating is called as__________
 A Ultrasonic expansion B Linear expansion C Superficial expansion D Cubical expansion
Question 22 Explanation:
When a body is heated or cooled, the length of the body changes due to change in its temperature. Then the expansion is said to be linear or longitudinal expansion.
 Question 23
What is the SI unit Coefficient of Linear expansion?
 A K B 1/K C J D J/K
Question 23 Explanation:
The SI unit of Coefficient of Linear expansion is K^-1. The value of coefficient of linear expansion is different for different materials. The ratio of increase in length of the body per degree rise in temperature to its unit length is called as the coefficient of linear expansion.
 Question 24
Which of the following is the equation relating the change in length and the change in temperature of a body?
 A ∆L/ Lo = αL ∆T B ∆L * Lo = αL ∆T C ∆L/ Lo = αL/ ∆T D ∆L – Lo = αL ∆T
Question 24 Explanation:
The equation relating the change in length and the change in temperature of a body is given below: ∆L/ Lo = αL ∆T ∆L - Change in length (Final length - Original length) Lo -Original length ∆T- Change in temperature (Final temperature - Initial temperature) αL -Coefficient of linear expansion.
 Question 25
Which of the following statement about Superficial expansion is correct?
1. It is also known as areal expansion
2. If there is an increase in the area of a solid object due to heating, then the expansion is called superficial
3. The SI unit of Coefficient of superficial expansion is K
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 25 Explanation:
If there is an increase in the area of a solid object due to heating, then the expansion is called superficial or areal expansion. The SI unit of Coefficient of superficial expansion is K^-1.
 Question 26
What does the coefficient of superficial expansion?
 A The ratio of increase in area of the body per degree rise in temperature to its unit area B The ratio of increase in length of the body per degree rise in temperature to its unit area C The ratio of increase in volume of the body per degree rise in temperature to its unit area D The ratio of increase in area of the body per degree rise in temperature to its unit length
Question 26 Explanation:
The ratio of increase in area of the body per degree rise in temperature to its unit area is called as coefficient of superficial expansion.
 Question 27
Which of the following statement correct about coefficient of superficial expansion??
1. Coefficient of superficial expansion is different for different materials.
2. Superficial expansion is determined in terms of coefficient of superficial expansion.
3. ∆A/ Ao = αA ∆T
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 27 Explanation:
Superficial expansion is determined in terms of coefficient of superficial expansion. Coefficient of superficial expansion is different for different materials. ∆A/ Ao = αA ∆T ∆A- Change in area (Final area - Initial area) Ao -Original area ∆T- Change in temperature (Final temperature - Initial temperature) αA-Coefficient of superficial expansion.
 Question 28
Which of the following statement is correct?
1. If there is an increase in the volume of a solid body due to heating, then the expansion is called cubical or volumetric expansion
2. The ratio of unit volume to its increase in volume of the body per degree rise in temperature is called as coefficient of cubical expansion.
3. The unit of coefficient of cubical expansion is 1/K
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 28 Explanation:
If there is an increase in the volume of a solid body due to heating, then the expansion is called cubical or volumetric expansion. As in the cases of linear and areal expansion, cubical expansion is also expressed in terms of coefficient of cubical expansion. The ratio of increase in volume of the body per degree rise in temperature to its unit volume is called as coefficient of cubical expansion. This is also measured in K^–1.
 Question 29
The equation relating to the change in volume and the change in temperature is_______
 A Vo/ ∆V = αV ∆T B ∆V/ Vo = αV/ ∆T C ∆V/ Vo = αV ∆T D ∆V Vo = αV ∆T
Question 29 Explanation:
The equation relating to the change in volume and the change in temperature is given below: ∆V/ Vo = αV ∆T ∆V - Change in volume (Final volume - Initial volume) Vo -Original volume ∆T- Change in temperature (Final temperature - Initial temperature) αV -Coefficient of cubical expansion Different materials possess different coefficient of cubical expansion.
 Question 30
Match the materials with their Coefficient of cubical expansion:
1. Brass                                  1. 18.2 × 10^–5
2. Glass                                  2. 2.5 × 10^–5
3. Mercury                         3. 7 × 10^–5
4. Aluminium                  4. 6 × 10^–5
 A 3, 1, 2, 4 B 4, 2, 1, 3 C 4, 1, 2, 3 D 3, 2, 1, 4
 Question 31
Which of the following substance has highest expansion when heated?
 A Solid B Liquid C Gas D Either a or b
Question 31 Explanation:
For a given rise in temperature, a liquid will have more expansion than a solid and a gaseous substance has the highest expansion when compared with the other two.
 Question 32
In which of the coefficient of cubical expansion of liquid is independent of temperature?
 A Solid B Liquid C Gas D None
Question 32 Explanation:
When heated, the atoms in a liquid or gas gain energy and are forced further apart. The coefficient of cubical expansion of liquid is independent of temperature whereas its value for gases depends on the temperature of gases.
 Question 33
• Assertion(A): We can define real expansion and apparent expansion in liquid
• Reason(R): The thermal energy supplied will be partly used in expanding the container and  partly used in expanding the liquid, this results in real expansion and apparent expansion in liquid
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 33 Explanation:
When a liquid is heated, it is done by keeping the liquid in some container and supplying heat energy to the liquid through the container. The thermal energy supplied will be partly used in expanding the container and partly used in expanding the liquid. Thus, what we observe may not be the actual or real expansion of the liquid. Hence, for liquids, we can define real expansion and apparent expansion.
 Question 34
Which of the following statement is correct?
1. If a liquid is heated directly without using any container, then the expansion that you observe is termed as real expansion of the liquid
2. The SI unit of coefficient of real expansion is K^–1.
 A 1 alone B 2 alone C 1, 2 D None
Question 34 Explanation:
If a liquid is heated directly without using any container, then the expansion that you observe is termed as real expansion of the liquid. Coefficient of real expansion is defined as the ratio of the true rise in the volume of the liquid per degree rise in temperature to its unit volume. The SI unit of coefficient of real expansion is K^–1.
 Question 35
• Assertion(A): The expansion of a liquid apparently observed without considering the expansion of  the container is called the apparent expansion of the liquid
• Reason(R): Heating a liquid without using a container is not possible. Thus, in practice, you can heat any liquid by pouring it in a container.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 35 Explanation:
Heating a liquid without using a container is not possible. Thus, in practice, we can heat any liquid by pouring it in a container. Thus, what you observe is not the actual or real expansion of the liquid. The expansion of a liquid apparently observed without considering the expansion of the container is called the apparent expansion of the liquid. Coefficient of apparent expansion is defined as the ratio of the apparent rise in the volume of the liquid per degree rise in temperature to its unit volume. The SI unit of coefficient of apparent expansion is K^–1.
 Question 36
Let L1, L2 and L3 be level of liquid before heating, level of liquid appears to have reduced when  heated and level of liquid due to expansion respectively. What is the real and Apparent expansion?
 A L3 – L2, L3 – L1 B L3 – L1, L3 – L2 C L3 – L1, L2 – L1 D L3 – L2 – L1, L1 – L3
Question 36 Explanation:
The difference between the levels L1 and L3 is called as apparent expansion, and the difference between the levels L2 and L3 is called real expansion. The real expansion is always more than that of apparent expansion. Real expansion = L3 – L2 Apparent expansion = L3 – L1
 Question 37
Which of the following is not a fundamental law of gases connecting pressure, volume, temperature?
 A Boyle’s Law B Avogadro's law C Newton’s law D Avogadro's law
Question 37 Explanation:
The three fundamental laws which connect the relation between pressure, volume and temperature are as follows: Boyle’s Law Charles's law Avogadro's law
 Question 38
According to Boyle’s law_____ is inversely proportional to pressure
 A Temperature B Volume of gas C Mass of gas D Area of gas
Question 38 Explanation:
When the temperature of a gas is kept constant, the volume of a fixed mass of gas is inversely proportional to its pressure. P α 1/V In other words, for an invariable mass of a perfect gas, at constant temperature, the product of its pressure and volume is a constant. (i.e.) PV = constant
 Question 39
Charles’s law was formulated by_______
 A Jacques Charles B Franki Charles C Francis Charles D Joseph Charles
Question 39 Explanation:
Charles’s law was formulated by a French scientist Jacques Charles. According to this law, When the pressure of gas is kept constant, the volume of a gas is directly proportional to the temperature of the gas. V α T or V T = constant
 Question 40
The value of Avogadro number_______
 A 6.023 × 1023 /mol B 6.023 × 10^23 /mol C 6.023 × 10^-23 /mol D 6.023 × 10^26 /mol
Question 40 Explanation:
Avogadro's law states that at constant pressure and temperature, the volume of a gas is directly proportional to number of atoms or molecules present in it. (i.e.) V α n (or) V/ n = constant Avogadro’s number (NA) is the total number of atoms per mole of the substance. It is equal to 6.023 × 10^23 /mol.
 Question 41
Which of the following statement is incorrect about Real Gases?
1. If the molecules or atoms of a gases interact with each other with a definite amount of intermolecular or inter atomic force of attraction, then the gases are said to be real gases.
2. At very high temperature or low pressure, real gas behaves as ideal gases
 A 1 alone B 2 alone C 1, 2 D None
Question 41 Explanation:
If the molecules or atoms of a gases interact with each other with a definite amount of intermolecular or inter atomic force of attraction, then the gases are said to be real gases. At very high temperature or low pressure, real gas behaves as ideal gases because in this condition there is no interatomic or intermolecular force of attraction.
 Question 42
Are real gas and Ideal Gas are same?
 A Yes B No C Yes, with some conditions D None
Question 42 Explanation:
If the atoms or molecules of a gas do not interact with each other, then the gas is said to be an ideal gas or a perfect gas. In-case of real gases, they interact with each other with a definite amount of intermolecular or inter atomic force of attraction.
 Question 43
• Assertion(A): In practice, no gas is ideal.
• Reason(R): The molecules of any gas will have a certain amount of interaction among them.
 A Both (A) and (R) are correct, but (R) does not explain (A) B Both (A) and (R) are wrong C Both (A) and (R) are correct and (R) explains (A) D (A) is Correct and (R) is wrong
Question 43 Explanation:
Actually, in practice, no gas is ideal. The molecules of any gas will have a certain amount of interaction among them. But, these interactions are weaker when the pressure is low or the temperature is high because the interatomic or intermolecular forces of attraction are weak in ideal gas. Hence, a real gas at low pressure or high temperature can be termed as a perfect gas.
 Question 44
Ideal gases obey which of the following laws?
1. Boyle’s law
2. Charles’s law
3. Avogadro’s law
 A 1, 2 B 1, 3 C 2, 3 D All the above
Question 44 Explanation:
Ideal gases obey Boyle’s law, Charles’s law and Avogadro’s law. All these laws state the relationship between various properties of a gas such as pressure (P), volume (V), temperature (T) and number of atoms (n). In a given state of the gas, all these parameters will have a definite set of values. When there is a change in the state of the gas, any one or more of these parameters change its value. The above said laws relate these changes.
 Question 45
Which of the following is Ideal gas equation?
 A PV = RT B PT = RV C PV = R/ T D P/ V = R/ T
Question 45 Explanation:
Ideal gas equation is also called as equation of state because it gives the relation between the state variables and it is used to describe the state of any gas. PV = RT
 Question 46
What is the value of Boltzmann constant?
 A 1.38 × 10^–23 JK^ -1 B 1.38 × 10^–23 JK C 1.38 × 10^–26 JK^–1 D 1.38 × 10^–26 JK^–1
Question 46 Explanation:
PV/ µNAT = constant The value of the constant in the above equation is taken to be kB, which is called as Boltzmann constant (1.38 × 10^–23 JK^–1).
 Question 47
A container whose capacity is 70 ml is filled with a liquid up to 50 ml. Then, the liquid in the container is heated. Initially, the level of the liquid falls from 50 ml to 48.5 ml. Then we heat more, the level of the liquid rises to 51.2 ml. Find the apparent expansion.
 A 1.2ml B 2.7ml C 1.5ml D 1.7ml
 Question 48
Keeping the temperature as constant, a gas is compressed four times of its initial pressure. The  volume of gas in the container changing from 20cc (V1 cc) to V2 cc. Find the final volume V2.
 A 5 cm^3 B 15 cm^3 C 25 cm^3 D 50 cm^3
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