6th Std Science Lesson Wise Questions in English – Part 2

6th Science Lesson 9 Questions in English

9] Changes Around Us

1. Which of the following is correct?

1. Change is the observable difference between initial state and the final state of any substance.
2. Change is the Law of Nature.
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Change is the Law of Nature. It is the observable difference between initial state and the final state of any substance.

2. Which of the following statement is correct?

1. Weather changes periodically (daily/ seasonly)
2. Seasons changes periodically
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Change is the Law of Nature. In our day – to – day life we see many changes around us. Weather changes periodically (daily/ seasonly), Seasons changes periodically.

3. It takes a few___ for milk to turn into curd

1. Hours
2. Days
3. Weeks
4. Months

Explanation

A paper burns readily while it takes a few days for an iron nail to rust. It takes a few hours for milk to turn into curd but vegetables get softened in a few minutes when cooked.

4. Which of the following property of matter changes?

1. Shape
2. Temperature
3. Position
4. Composition
5. 1, 2
6. 2, 3
7. 3, 4
8. 1, 2, 3, 4

Explanation

The said changes are accompanied by change in properties like shape, colour, temperature, position and composition. Some changes can be observed while some are not possible to notice.

5. Which of the following is correct about Changes?

1. Some changes take place very quickly while others take hours, days or even years.
2. Some changes are temporary while some others are permanent.
3. Some changes produce new substances while others do not
4. All the above

Explanation

There are different types of changes observed in nature that occurs around us. Some changes take place very quickly while others take hours, days or even years. Some changes are temporary while some others are permanent. Some changes produce new substances while others do not. Some changes are natural while others are made by human beings.

6. Which of the following are the basis of certain similarities and differences of Changes?

1. Slow and fast
2. Reversible and irreversible
3. Desirable and undesirable
4. 1, 2
5. 2, 3
6. 1, 3
7. 1, 2, 3

Explanation

We shall now try to classify changes on the basis of certain similarities and differences. ϖ slow and fast ϖ reversible and irreversible ϖ physical and chemical changes ϖ desirable and undesirable ϖ natural and man – made

7. Which of the following is an example of slow change?

1. growth of nail and hair
2. germination of seed
3. bursting of fire crackers
4. 1, 2
5. 2, 3
6. 1, 3
7. 1, 2, 3

Explanation

Changes which take place over a long period of time (hours / days / months / years) are known as Slow changes. Examples: growth of nail and hair, change of seasons, germination of seed.

8. What’s the time taken by Slow changes to take place?

1. Hours
2. Days
3. Months
4. All the above

Explanation

Changes which take place over a long period of time (hours / days / months / years ) are known as Slow changes. Examples: growth of nail and hair, change of seasons, germination of seed.

9. What’s the time taken by Fast changes to take place?

1. Seconds
2. Minutes
3. a or b
4. none

Explanation

Changes which take place within a short period of time (seconds or minutes) are known as fast changes. Examples: Bursting of balloon, breaking of glass, bursting of fire crackers, burning of paper.

10. Which of the following is an example of fast change?

1. Bursting of balloon
2. breaking of glass
3. burning of paper
4. all the above

Explanation

Changes which take place within a short period of time (seconds or minutes) are known as fast changes. Examples: Bursting of balloon, breaking of glass, bursting of fire crackers, burning of paper.

11. Which of the following is an example of Reversible change?

1. Touch me not plant
2. stretching of rubber band
3. melting of ice
4. 1, 2
5. 2, 3
6. 1, 2, 3
7. None

Explanation

Changes which can be reversed (to get back the original state) are known as reversible changes. Examples: Touch me not plant (Responding to touch), stretching of rubber band, melting of ice.

12. Which of the following is incorrect about Reversible change?

1. Changes which cannot be reversed are known as reversible changes.
2. making idly from batter is an example of reversible change
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Changes which can be reversed (to get back the original state) are known as reversible changes. Examples: Touch me not plant (Responding to touch), stretching of rubber band, melting of ice.

13. Which of the following is an example of Irreversible change?

1. Change of milk into curd
2. melting of ice
3. making idly from batter
4. 1, 3
5. 2, 3
6. 1, 2, 3
7. None

Explanation

Changes which cannot be reversed or to get back the original state are known as Irreversible changes.

Examples: Change of milk into curd, digestion of food, making idly from batter

14. Which of the following is correct about Irreversible changes?

1. Changes which cannot be reversed or to get back the original state are known as Irreversible changes.
2. Change of milk into curd is an example of Irreversible change
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Changes which cannot be reversed or to get back the original state are known as Irreversible changes.

Examples: Change of milk into curd, digestion of food, making idly from batter

15. Change of colour of cut apple is___ change

1. Physical
2. Chemical
3. Electrical
4. None

Explanation

Cut one half into pieces and share it with your friends. You can see brown patches formed on the cut surface because of the reaction between some substances in the apple and the air around it. This is a Chemical change.

16. The change in shape of cut apple is called as____ change

1. Physical
2. Chemical
3. Biological
4. None

Explanation

Cut one half into pieces and share it with your friends, only the shape and size have changed. This can be called a physical change.

17. Physical changes are the____ changes

1. Temporary
2. Permanent
3. Both a and b
4. None

Explanation

Physical changes are the temporary changes in which there is change in the physical appearance of the substance but not in its chemical composition. Here no new substance is formed.

18. Which of the following is correct about physical change?

1. No change in chemical composition
2. New substance is formed
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Physical changes are the temporary changes in which there is change in the physical appearance of the substance but not in its chemical composition. Here no new substance is formed.

19. Which of the following is an example of Physical change?

1. Melting of ice
2. solution of salt or sugar
3. stretching of rubber band
4. 1, 2
5. 1, 2, 3
6. 2, 3
7. 1, 3

Explanation

Physical changes are the temporary changes in which there is change in the physical appearance of the substance but not in its chemical composition. Here no new substance is formed. Example: Melting of ice, the solution of salt or sugar, stretching of rubber band.

20. Which of the following are correctly matched?

1. water into steam on heating – vapourisation
2. water into ice on cooling – melting
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Ice into water on heating – melting

Water into steam on heating – vapourisation

Steam into water on cooling – condensation

Water into ice on cooling – freezing

21. Which of the following are incorrectly matched?

1. Steam into water on cooling – condensation
2. Ice into water on heating – melting
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Ice into water on heating – melting

Water into steam on heating – vapourisation

Steam into water on cooling – condensation

Water into ice on cooling – freezing

22. Water exists in three states as______

1. Solid
2. Liquid
3. Gas
4. 1, 2
5. 2 alone
6. 1, 2, 3
7. 2, 3

Explanation

Water exists in three states as solid, liquid and gas. Change of state takes place either by heating or cooling. By heating energy is supplied and by cooling energy is taken away. These are the reasons for the changes.

23. Which of the following is correct?

1. Change of state takes place either by heating or cooling.
2. By heating energy is supplied and by cooling energy is taken away.
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Water exists in three states as solid, liquid and gas. Change of state takes place either by heating or cooling. By heating energy is supplied and by cooling energy is taken away. These are the reasons for the changes.

24. The change of state from solid to gas directly is called_____

1. Melting
2. Sublimation
3. Condensation
4. None

Explanation

The change of state from solid to gas directly is called Sublimation.

Example: Camphor

25. Which of the following is an example of Sublimation?

1. Ice
2. NaCl
3. Camphor
4. All the above

Explanation

The change of state from solid to gas directly is called Sublimation. Example: Camphor

26. The spreading of the solid particles among the liquid molecules is called as___

1. Dissolution
2. Condensation
3. Sublimation
4. All the above

Explanation

The spreading of the solid particles (broken into individual molecules) among the liquid molecules is called as dissolution.

27. Which of the following is the correct statement?

1. Solute is a substance that dissolves the solvent.
2. Solute is a substance that is dissolved in a solvent to make a solution.
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Solvent is a substance that dissolves the solute. Solute is a substance that is dissolved in a solvent to make a solution. When solute is dissolved in a solvent it forms a solution.

28.____ is known as the universal solvent.

1. Water
2. Kerosene
3. Methane
4. Ethane

Explanation

Water is known as the universal solvent. It dissolves a wide range of substance.

29.____ dissolves a wide range of substance.

1. Methane
2. Ethane
3. Kerosene
4. Water

Explanation

Water is known as the universal solvent. It dissolves a wide range of substance.

30. Chemical changes are the_____ changes

1. Temporary
2. Permanent
3. Both a and b
4. None

Explanation

Chemical changes are the permanent changes in which there is change in the chemical composition and new substance is formed.

31. Which of the following statement is correct?

1. Chemical changes are the permanent changes in which there is change in the chemical composition
2. No new substance is formed.
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Chemical changes are the permanent changes in which there is change in the chemical composition and new substance is formed. Examples: Burning of wood, Popping of popcorn, Blackening of silver ornaments, and Rusting of iron.

32. Which of the following is not an example of chemical change?

1. Burning of wood
2. Popping of popcorn
3. Rusting of iron
4. None

Explanation

Chemical changes are the permanent changes in which there is change in the chemical composition and new substance is formed. Examples: Burning of wood, Popping of popcorn, Blackening of silver ornaments, and Rusting of iron.

33. Which of the following statement is correct?

1. Physical Change is reversible
2. Chemical Change is irreversible
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

34. Which of the following is an example of Desirable changes?

1. Ripening of fruit
2. growth of plants
3. milk changing to curd
4. all the above

Explanation

The changes which are useful, not harmful to our environment and desired by us are known as desirable changes. Examples: Ripening of fruit, growth of plants, cooking of food, milk changing to curd.

35. The changes which are useful, not harmful to our environment and desired by us are known as____

1. Desirable changes
2. Undesirable changes
3. Both a and b
4. None

Explanation

The changes which are useful, not harmful to our environment and desired by us are known as desirable changes. Examples: Ripening of fruit, growth of plants, cooking of food, milk changing to curd.

36. Which of the following is an example of undesirable change?

1. Ripening of fruit
2. cooking of food
3. Deforestation
4. milk changing to curd

Explanation

The changes which are harmful to our environment and not desired by us are known as Undesirable changes. Examples: Deforestation, decaying of fruit, rusting of iron.

37. The changes which are harmful to our environment and not desired by us are known as__

1. Desirable change
2. Undesirable change
3. Both a and b
4. None

Explanation

The changes which are harmful to our environment and not desired by us are known as Undesirable changes. Examples: Deforestation, decaying of fruit, rusting of iron.

38. Which of the following statement is correct?

1. Changes which take place in nature on their own and are beyond the control of human beings are known as Natural changes
2. The changes which are brought about by human beings are known as human made or artificial changes
3. 1 alone
4. 2 alone
5. 1, 2
6. None

Explanation

Changes which take place in nature on their own and are beyond the control of human beings are known as Natural changes. Examples: Rotation of the earth, Changing phases of the Moon, Rain.

The changes which are brought about by human beings are known as human made or artificial changes. They will not happen on their own. Examples: Cooking, Deforestation, Cultivating crops, construction of buildings.

39. Which of the following is an example of Natural changes?

1. Rotation of the earth
2. Changing phases of the Moon
3. Rain
4. All the above

Explanation

Changes which take place in nature on their own and are beyond the control of human beings are known as Natural changes. Examples: Rotation of the earth, Changing phases of the Moon, Rain.

40. Which of the following is not an example of Human made change?

1. Rain
2. Cooking
3. Deforestation
4. All the above

Explanation

The changes which are brought about by human beings are known as human made or artificial changes. They will not happen on their own. Examples: Cooking, Deforestation, Cultivating crops, construction of buildings.

41. Which of changes will not take place on their own?

1. artificial changes
2. Natural changes
3. Both a and b
4. None

Explanation

The changes which are brought about by human beings are known as human made or artificial changes. They will not happen on their own. Examples: Cooking, Deforestation, Cultivating crops, construction of buildings.