NMMS CLASS 7 Physical and Chemical Changes 7

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👉 ALL NMMS INTERACTIVE TESTS 👈


NMMS CLASS 7 Physical and Chemical Changes 7👇


1. When iron reacts with oxygen and moisture, it forms

  • Hydrated salt
  • Iron chloride
  • Iron vapour
  • Rust — a chemical change

2. When ice melts in a glass, the temperature

  • Remains constant until all ice melts
  • Increases continuously
  • Decreases continuously
  • Becomes equal to 0°C immediately

3. Acids taste

  • Bitter
  • Sweet
  • Sour
  • Salty

4. Bases turn red litmus

  • Blue
  • Pink
  • Colourless
  • Green

5. Rusting occurs faster in

  • Dry air
  • Humid air
  • Vacuum
  • Distilled water

6. Which among the following is an example of exothermic change?

  • Burning of wood
  • Melting of ice
  • Evaporation of water
  • Photosynthesis

7. The change in which energy is absorbed from surroundings is

  • Endothermic
  • Exothermic
  • Reversible
  • Thermal

8. When water boils at 100°C, it changes into steam. This is a

  • Chemical change
  • Irreversible change
  • Temporary reaction
  • Physical change

9. The chemical formula of rust is

  • FeCO₃
  • FeCl₂
  • FeSO₄
  • Fe₂O₃·xH₂O

10. The process of coating iron with zinc to prevent rusting is called

  • Rusting
  • Galvanisation
  • Insulation
  • Zincation

11. When an acid reacts with a metal, it produces

  • Oxygen
  • Carbon dioxide
  • Nitrogen
  • Hydrogen gas

12. The process of converting milk to curd is

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

13. When we boil water, bubbles are formed due to

  • Formation of oxygen
  • Formation of water vapour
  • Air dissolved
  • Hydrogen gas

14. The neutralisation reaction produces

  • Salt and water
  • Carbon dioxide
  • Oxygen
  • Hydrogen

15. Acids turn blue litmus

  • Red
  • Colourless
  • Green
  • No change

16. Bases taste

  • Sour
  • Salty
  • Sweet
  • Bitter and soapy

17. Which metal does not rust?

  • Aluminium
  • Iron
  • Copper
  • Zinc

18. When carbon dioxide reacts with lime water, it turns

  • Milky
  • Colourless
  • Yellow
  • Blue

19. A burning candle gives both

  • Only physical changes
  • Only chemical changes
  • Reversible changes
  • Physical and chemical changes

20. Evaporation of water is

  • Endothermic physical change
  • Exothermic chemical change
  • Irreversible change
  • Temporary process

21. The gas evolved when zinc reacts with hydrochloric acid is

  • Hydrogen
  • Oxygen
  • Carbon dioxide
  • Nitrogen

22. When acid reacts with base, the reaction is called

  • Neutralisation
  • Oxidation
  • Reduction
  • Evaporation

23. The indicator that turns pink in base is

  • Phenolphthalein
  • Litmus
  • Turmeric
  • Methyl orange

24. Rusting can be prevented by

  • Heating the metal
  • Painting or galvanising
  • Exposing to air
  • Adding acid

25. Boiling of water is

  • Physical change
  • Chemical change
  • Temporary change
  • Irreversible change

26. When a base reacts with an acid, heat is

  • Released — exothermic
  • Absorbed — endothermic
  • Remains constant
  • Lost as light

27. Which of the following is a strong acid?

  • Acetic acid
  • Citric acid
  • Carbonic acid
  • Hydrochloric acid (HCl)

28. When we apply baking soda on a bee sting, it

  • Neutralises the acid effect
  • Increases acidity
  • Reacts to form hydrogen gas
  • Evaporates moisture

29. The salt obtained from HCl and NaOH is

  • Sodium chloride
  • Sodium carbonate
  • Calcium chloride
  • Magnesium oxide

30. Burning of LPG in air produces

  • Hydrogen gas
  • Sulphur dioxide
  • Carbon dioxide and water vapour
  • Nitrogen oxide

31. Which is an example of reversible change?

  • Burning of wood
  • Cooking of food
  • Melting of wax
  • Rusting of iron

32. When magnesium reacts with acid, it forms

  • Magnesium chloride and hydrogen
  • Magnesium hydroxide
  • Magnesium oxide
  • Hydrogen peroxide

33. The change which can be reversed by cooling is

  • Melting of ice
  • Cooking of food
  • Rusting
  • Burning of paper

34. A base neutralises an acid to form

  • Hydrogen
  • Carbon dioxide
  • Alcohol
  • Salt and water

35. Rusting is prevented by covering iron with

  • Zinc
  • Sulphur
  • Carbon
  • Magnesium

36. When sulphur burns in air, the gas formed is

  • Sulphur dioxide
  • Carbon dioxide
  • Hydrogen sulphide
  • Nitrogen oxide

37. When quicklime reacts with water,

  • Heat is absorbed
  • Heat is released
  • No change
  • Cooling occurs

38. Which one among the following is an endothermic reaction?

  • Burning of wood
  • Neutralisation
  • Condensation
  • Photosynthesis

39. Acids react with metals to form

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

40. When a hot object cools, heat

  • Is transferred to surroundings
  • Is absorbed
  • Disappears
  • Is created

41. Bases react with acids to form

  • Salt and water
  • Hydrogen and oxygen
  • Carbon dioxide
  • Chlorine gas

42. Rusting of iron occurs faster in

  • Coastal regions
  • Dry desert areas
  • Vacuum
  • Cold dry places

43. When lime water turns milky, it shows presence of

  • Oxygen
  • Hydrogen
  • Nitrogen
  • Carbon dioxide

44. The reaction between acid and base is

  • Endothermic
  • Physical
  • Reversible
  • Exothermic

45. When we apply vinegar on baking soda, the mixture becomes cool. It is

  • Endothermic reaction
  • Exothermic reaction
  • Physical change
  • Neutralisation

46. When aluminium reacts with hydrochloric acid, the gas produced is

  • Hydrogen
  • Oxygen
  • Carbon dioxide
  • Nitrogen

47. Which of the following changes involve both heat and gas production?

  • Freezing of water
  • Melting of wax
  • Evaporation of alcohol
  • Burning of wood

48. The rusting of iron spoils iron articles because

  • It weakens the metal
  • It increases luster
  • It makes it heavy
  • It strengthens it

49. The burning of a candle wax is

  • Endothermic
  • Exothermic
  • Reversible
  • Physical

50. When baking soda is added to lemon juice, it produces

  • Carbon dioxide
  • Hydrogen
  • Nitrogen
  • Ammonia
Location: Mogalturu, Andhra Pradesh 534281, India

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