Physical and chemical changes in matter for OTET
1. Which of the following is an example of a physical change?
a) Burning of wood
b) Rusting of iron
c) Melting of ice
d) Cooking an egg
Answer: c) Melting of ice
2. When water evaporates, it is an example of:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: a) Physical change
3. What happens to the mass of a substance during a physical change?
a) It increases
b) It decreases
c) It remains the same
d) It varies depending on the substance
Answer: c) It remains the same
4. Which of the following is an example of a chemical change?
a) Dissolving sugar in water
b) Breaking a glass bottle
c) Chopping vegetables
d) Burning paper
Answer: d) Burning paper
5. In a chemical change, the original substances:
a) Are destroyed
b) Are transformed into new substances
c) Remain unchanged
d) Cannot be determined
Answer: b) Are transformed into new substances
6. When milk turns sour, it is a result of a:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: b) Chemical change
7. What happens to the chemical composition of a substance during a physical change?
a) It remains the same
b) It is completely altered
c) It partially changes
d) It depends on the conditions of the change
Answer: a) It remains the same
8. Which of the following is an example of a physical change involving a change in state?
a) Burning of wood
b) Digestion of food
c) Evaporation of water
d) Fermentation of grapes
Answer: c) Evaporation of water
9. When iron rusts, it is a result of a:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: b) Chemical change
10. What is the main difference between physical and chemical changes?
a) Physical changes involve a change in chemical composition, while chemical changes do not.
b) Physical changes are reversible, while chemical changes are irreversible.
c) Physical changes only affect the physical properties of a substance, while chemical changes alter its chemical properties.
d) There is no difference; the terms "physical change" and "chemical change" are used interchangeably.
Answer: c) Physical changes only affect the physical properties of a substance, while chemical changes alter its chemical properties.
11. When a candle burns, it undergoes a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
12. Boiling of water is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: a) Physical
13. Which of the following is an example of a physical change?
a) Digesting food
b) Rotting of fruits
c) Freezing of water
d) Rusting of iron
Answer
: c) Freezing of water
14. The formation of rust on iron is an example of a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
15. Which of the following is an example of a chemical change?
a) Melting of wax
b) Tearing a piece of paper
c) Decomposition of food
d) Mixing salt and water
Answer: c) Decomposition of food
16. The process of photosynthesis is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
17. Which of the following is an example of a physical change?
a) Digestion of food
b) Burning of wood
c) Formation of clouds
d) Decay of leaves
Answer: c) Formation of clouds
18. The digestion of food in our body is an example of a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
19. Which of the following is an example of a chemical change?
a) Mixing salt and sugar
b) Boiling water
c) Burning of gasoline
d) Cutting a piece of paper
Answer: c) Burning of gasoline
20. The process of respiration is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
21. Which of the following is an example of a physical change?
a) Rusting of iron
b) Digestion of food
c) Melting of butter
d) Burning of wood
Answer: c) Melting of butter
22. The formation of a precipitate in a chemical reaction is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: c) Both physical and chemical
23. Which of the following is an example of a physical change?
a) Corroding of metal
b) Breaking glass
c) Burning of a candle
d) Rotting of food
Answer: b) Breaking glass
24. The process of evaporation is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: a) Physical
25. Which of the following is an example of a chemical change?
a) Dissolving salt in water
b) Grinding coffee beans
c) Molding clay
d) Digesting food
Answer: d) Digesting food
26. The cooking of an egg is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
27. Which of the following is an example of a physical change?
a) Decomposing food
b) Burning of fuel
c) Boiling of water
d) Rusting of iron
Answer: c) Boiling of water
28. The burning of wood is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b
) Chemical
29. Which of the following is an example of a physical change?
a) Digesting food
b) Burning of paper
c) Melting of chocolate
d) Formation of clouds
Answer: c) Melting of chocolate
30. The formation of gas bubbles in a chemical reaction is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
31. Which of the following is an example of a chemical change?
a) Dissolving sugar in water
b) Breaking a glass bottle
c) Chopping vegetables
d) Burning paper
Answer: d) Burning paper
32. In a chemical change, the original substances:
a) Are destroyed
b) Are transformed into new substances
c) Remain unchanged
d) Cannot be determined
Answer: b) Are transformed into new substances
33. When a piece of iron is exposed to air and moisture, it rusts. This is an example of:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: b) Chemical change
34. What happens to the chemical composition of a substance during a physical change?
a) It remains the same
b) It is completely altered
c) It partially changes
d) It depends on the conditions of the change
Answer: a) It remains the same
35. Which of the following is an example of a physical change involving a change in state?
a) Burning of wood
b) Digestion of food
c) Evaporation of water
d) Fermentation of grapes
Answer: c) Evaporation of water
36. When a candle burns, it produces heat, light, and carbon dioxide gas. This is an example of:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: b) Chemical change
37. What is the main difference between physical and chemical changes?
a) Physical changes involve a change in chemical composition, while chemical changes do not.
b) Physical changes are reversible, while chemical changes are irreversible.
c) Physical changes only affect the physical properties of a substance, while chemical changes alter its chemical properties.
d) There is no difference; the terms "physical change" and "chemical change" are used interchangeably.
Answer: c) Physical changes only affect the physical properties of a substance, while chemical changes alter its chemical properties.
38. When milk turns sour, it is a result of a:
a) Physical change
b) Chemical change
c) Both physical and chemical change
d) None of the above
Answer: b) Chemical change
39. Boiling of water is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: a) Physical
40. Which of the following is an example of a physical change?
a) Digesting food
b) Rotting of fruits
c) Freezing of water
d) Rusting of iron
Answer: c) Freezing of water
41. The formation of rust on iron is an example of a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
42. Which of the following is an example of a chemical change?
a) Mixing salt and sugar
b) Boiling water
c) Burning of gasoline
d) Cutting a piece of paper
Answer: c) Burning of gasoline
43. The process of photosynthesis is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
44. Which of the following is an example of a physical change?
a) Digestion of food
b) Burning of wood
c) Formation of clouds
d) Decay of leaves
Answer: c) Formation of clouds
45. The digestion of food in our body is an example of a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
46. Which of the following is an example of a chemical change?
a) Mixing salt and sugar
b) Boiling water
c) Burning of gasoline
d) Cutting a piece of paper
Answer: c) Burning of gasoline
47. The process of respiration is a __________ change.
a) Physical
b) Chemical
c) Both physical and chemical
d) None of the above
Answer: b) Chemical
48. Which of the following is an example of a physical change?
a) Rusting of iron
b) Dissolving sugar in water
c) Combustion of wood
d) Rotting of fruits
Answer: b) Dissolving sugar in water
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