NMMS CLASS 7 Physical and Chemical Changes 3

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NMMS CLASS 7 Physical and Chemical Changes 3👇




1. When a cold drink bottle is taken out from the refrigerator, droplets appear on its outer surface because of

  • Evaporation
  • Melting
  • Condensation
  • Freezing

2. Iron nails are dipped in oil to prevent rusting because oil

  • Prevents contact with air and moisture
  • Makes iron heavier
  • Removes oxygen from air
  • Increases reaction speed

3. When vinegar reacts with baking soda, fizzing occurs due to the release of

  • Hydrogen gas
  • Oxygen gas
  • Carbon dioxide gas
  • Nitrogen gas

4. When iron reacts with copper sulphate solution, the blue colour fades because

  • Copper reacts with water
  • Air oxidizes copper
  • Iron displaces copper
  • Copper evaporates

5. A reddish-brown gas is produced when heating lead nitrate — this gas is

  • Carbon dioxide
  • Hydrogen
  • Nitrogen dioxide
  • Sulphur dioxide

6. Why does food kept outside spoil faster in summer?

  • High temperature speeds up chemical reactions
  • Low temperature stops reactions
  • Air becomes dry
  • No oxygen is available

7. Ice floats on water because

  • Its density is less than water
  • It absorbs air
  • It has salt
  • It is heavier

8. Which one shows both physical and chemical changes simultaneously?

  • Melting of ice
  • Burning of paper
  • Lighting of a candle
  • Sublimation of camphor

9. Which of these indicates a chemical change?

  • Evaporation
  • Condensation
  • Change in colour
  • Freezing

10. When water boils, bubbles form due to

  • Formation of air
  • Formation of oxygen
  • Formation of water vapour
  • Release of hydrogen

11. The black coating on silver ornaments turns black due to

  • Reaction with carbon dioxide
  • Oxidation by nitrogen
  • Reaction with sulphur compounds in air
  • Rusting

12. When a new substance is formed during a change, it is called a

  • Physical change
  • Temporary change
  • Chemical change
  • Reversible change

13. The bubbles formed when acid reacts with metal are due to

  • Hydrogen gas
  • Oxygen gas
  • Water vapour
  • Carbon dioxide

14. The digestion of food inside our body is a

  • Physical change
  • Mechanical change
  • Chemical change
  • Reversible change

15. The glowing of electric bulb filament is

  • Chemical change
  • Reversible change
  • Physical change
  • Permanent change

16. The rusting of iron is faster in coastal areas because of

  • Presence of moisture and salt
  • High temperature
  • Low humidity
  • Less oxygen

17. Dry ice changes directly into gas without becoming liquid because of

  • Condensation
  • Evaporation
  • Sublimation
  • Melting

18. When milk is converted to curd, bacteria convert

  • Lactose into lactic acid
  • Protein into sugar
  • Fat into alcohol
  • Water into glucose

19. Which one of these is not a physical change?

  • Melting of wax
  • Breaking glass
  • Boiling water
  • Ripening of fruit

20. Why is burning of coal considered a chemical change?

  • Because a new substance and heat are produced
  • Because only shape changes
  • Because it is reversible
  • Because water is formed

21. When butter melts on a hot pan, the change is

  • Chemical change
  • Permanent change
  • Physical change
  • Irreversible

22. The reaction between quicklime and water is

  • Endothermic
  • Physical
  • Exothermic
  • Reversible

23. Why is stretching of a rubber band reversible?

  • It returns to its original shape
  • It produces gas
  • It changes composition
  • It burns easily

24. Mixing blue and yellow paints produces green paint. This is

  • Chemical change
  • Permanent change
  • Physical change
  • Reversible

25. Which of these changes is not easily reversible?

  • Freezing water
  • Melting wax
  • Condensation of steam
  • Cooking rice

26. A blacksmith heats a metal rod and beats it to shape. This involves

  • Physical change only
  • Chemical change
  • Both changes
  • Reversible change

27. When sodium reacts with water, a gas is released. That gas is

  • Hydrogen
  • Oxygen
  • Carbon dioxide
  • Nitrogen

28. When bleaching powder is added to water, chlorine smell appears. This is a

  • Physical change
  • Reversible change
  • Chemical change
  • Mechanical change

29. Evaporation of perfume is

  • Chemical change
  • Permanent change
  • Physical change
  • Reversible

30. Burning of coal produces ash, carbon dioxide, and heat — it is

  • Physical change
  • Temporary change
  • Chemical change
  • Reversible

31. A blacksmith dipping hot iron in water causes

  • Physical change
  • Chemical change
  • Reversible change
  • Formation of rust

32. Which is true about physical changes?

  • A new substance is formed
  • Energy is always absorbed
  • They are permanent
  • No new substance is formed

33. Which among these shows change in state but not in composition?

  • Rusting of iron
  • Cooking of egg
  • Souring of milk
  • Melting of ice

34. The colour change in copper vessels indicates

  • Evaporation
  • Condensation
  • Corrosion
  • Deposition

35. When an iron nail is kept in copper sulphate solution, it becomes brown because

  • Copper is deposited on iron
  • Iron dissolves
  • Rust forms
  • Zinc reacts

36. Heating sugar strongly gives a black substance called

  • Carbon
  • Rust
  • Charcoal
  • Soot

37. The gas released during burning of carbon is

  • Carbon dioxide
  • Hydrogen
  • Nitrogen
  • Oxygen

38. When silver articles turn black, it is due to the formation of

  • Silver sulphide
  • Silver nitrate
  • Silver chloride
  • Silver oxide

39. The bubbles formed when limestone reacts with acid indicate

  • Release of carbon dioxide
  • Formation of water
  • Formation of nitrogen
  • Absorption of oxygen

40. The chemical change responsible for energy in our body is

  • Photosynthesis
  • Digestion
  • Respiration
  • Fermentation

41. The product formed when iron reacts with sulphur on heating is

  • Iron sulphide
  • Iron oxide
  • Iron chloride
  • Iron hydroxide

42. When steam condenses on a cold surface, it is

  • Chemical change
  • Permanent change
  • Physical change
  • Irreversible

43. Which is an example of reversible physical change?

  • Burning of paper
  • Rusting of iron
  • Cooking of food
  • Dissolving sugar in water

44. When copper is heated in air, it forms a black coating of

  • Copper oxide
  • Copper carbonate
  • Copper sulphate
  • Copper hydroxide

45. When water vapour turns into frost, it is

  • Chemical change
  • Reversible
  • Physical change
  • Permanent

46. Baking of cake involves

  • Physical change
  • Reversible change
  • Chemical change
  • Temporary change

47. Which one shows both absorption and release of energy?

  • Freezing of water
  • Condensation of vapour
  • Burning of candle
  • Melting of ice

48. A change in which no new substance is formed but shape or size changes is

  • Chemical change
  • Irreversible change
  • Physical change
  • Reversible

49. Which among the following produces heat and light energy?

  • Evaporation
  • Melting
  • Condensation
  • Combustion

50. Which one is a characteristic of a chemical change?

  • Change in shape only
  • Change in size
  • No energy involvement
  • Formation of new substance
Location: Mogalturu, Andhra Pradesh 534281, India

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