NMMS CLASS 7 Physical and Chemical Changes 6

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👉 ALL NMMS INTERACTIVE TESTS 👈





1. When 56 g of iron reacts completely with oxygen to form rust (Fe₂O₃·xH₂O), the mass of rust formed will be

  • More than 56 g
  • Equal to 56 g
  • Less than 56 g
  • Depends on humidity

2. In a physical change, the total mass of the substance

  • Increases
  • Decreases
  • Becomes zero
  • Remains same

3. When magnesium burns in oxygen, 24 g of magnesium forms 40 g of magnesium oxide. The gain in mass is due to

  • Combination with oxygen
  • Evaporation of magnesium
  • Loss of water
  • Absorption of nitrogen

4. Rusting of iron is an example of

  • Rapid oxidation
  • Decomposition
  • Slow oxidation
  • Sublimation

5. When 10 g of water is frozen, the weight of ice formed will be

  • 10 g
  • More than 10 g
  • Less than 10 g
  • Zero

6. When baking soda (NaHCO₃) is heated, carbon dioxide is released. This reaction is

  • Combination — physical change
  • Decomposition — chemical change
  • Evaporation — physical change
  • Diffusion — reversible change

7. The rusting process involves

  • Gain of oxygen
  • Loss of hydrogen
  • Loss of oxygen
  • Combination with carbon

8. When iron and sulphur are heated together, the product is

  • FeS (iron sulphide)
  • FeSO₄
  • Fe₂O₃
  • Fe(OH)₂

9. The change that occurs when heat energy is absorbed is

  • Exothermic change
  • Endothermic change
  • Combustion
  • Temporary change

10. In burning of a candle, the total mass before and after burning is

  • Less after burning
  • Equal (if gases are collected)
  • More after burning
  • Doubles

11. When carbon reacts with oxygen, the product is

  • Carbon monoxide
  • Carbon
  • Water vapour
  • Carbon dioxide

12. Heating calcium carbonate produces

  • Calcium oxide + Carbon dioxide
  • Calcium hydroxide
  • Calcium chloride + Oxygen
  • Quicklime + Water

13. When water freezes, its volume

  • Increases slightly
  • Decreases
  • Remains same
  • Becomes zero

14. A piece of iron gains 2.4 g weight after rusting. The gain in weight is due to

  • Absorption of nitrogen
  • Loss of hydrogen
  • Evaporation
  • Addition of oxygen

15. Chemical changes are usually accompanied by

  • Change in size
  • No temperature change
  • Reversible process
  • Energy change

16. Melting of ice at 0°C is an example of

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

17. Burning of fuel like LPG or wood is

  • Exothermic chemical change
  • Endothermic physical change
  • Reversible
  • Physical

18. In condensation, heat is

  • Released to surroundings
  • Absorbed
  • Neither gained nor lost
  • Converted to sound

19. Rusting occurs more quickly at

  • Low humidity
  • High temperature only
  • Dry air
  • High humidity

20. When 1 g of magnesium reacts with oxygen, about 1.67 g of magnesium oxide forms. The extra 0.67 g comes from

  • Oxygen
  • Hydrogen
  • Water vapour
  • Air pressure

21. When vinegar reacts with baking soda, it releases gas and the temperature of the mixture

  • Decreases — endothermic
  • Increases — exothermic
  • Remains same
  • Turns hot rapidly

22. When ice melts, the energy

  • Is absorbed from surroundings
  • Is released
  • Remains constant
  • Becomes light energy

23. The burning of wood releases

  • Heat, light, and carbon dioxide
  • Heat only
  • Smoke only
  • Oxygen only

24. The conversion of liquid wax into vapour on heating is

  • Chemical change
  • Physical change
  • Exothermic change
  • Irreversible

25. Burning of fuel is an example of

  • Physical change
  • Temporary change
  • Combustion — chemical reaction
  • Evaporation

26. The reaction that gives off energy to the surroundings is

  • Endothermic
  • Physical
  • Neutralisation
  • Exothermic

27. Melting of ice is an

  • Endothermic process
  • Exothermic process
  • Combustion
  • Irreversible change

28. The law of conservation of mass applies to

  • Both physical and chemical changes
  • Only physical changes
  • Only chemical changes
  • Irreversible changes

29. Heating blue copper sulphate crystals forms

  • White copper sulphate and water vapour
  • Blue copper oxide
  • Black copper carbonate
  • Green compound

30. Burning of magnesium produces

  • Yellow ash
  • Green flakes
  • White powder of magnesium oxide
  • Grey residue

31. The energy absorbed or released during a chemical change is usually in the form of

  • Sound
  • Heat
  • Magnetism
  • Electricity

32. When a piece of wood burns completely, the total mass of ash and gases

  • Equals the original mass of wood
  • Is greater
  • Is lesser
  • Becomes zero

33. Which one of the following is not a chemical change?

  • Burning of paper
  • Cooking of food
  • Rusting of iron
  • Boiling of water

34. The process that needs continuous heating to occur is

  • Exothermic change
  • Reversible reaction
  • Neutralisation
  • Endothermic change

35. When two liquids are mixed and heat is released, the process is

  • Exothermic
  • Endothermic
  • Physical
  • Reversible

36. Rusting involves

  • Oxidation and hydration
  • Dehydration
  • Evaporation
  • Condensation

37. In a physical change, molecules

  • Remain same but arrangement changes
  • Change completely
  • Break and reform
  • React chemically

38. The mass of reactants before a chemical change equals

  • Mass of products — law of conservation of mass
  • Half of product
  • Less than product
  • Greater than product

39. When wax melts and resolidifies, energy is

  • Continuously absorbed
  • Continuously released
  • No energy change
  • First absorbed, then released

40. When ammonium chloride is heated, it sublimes and deposits again on cooling. This is

  • Chemical change
  • Exothermic
  • Physical change
  • Irreversible

41. A colorless gas turns lime water milky. It is

  • Carbon dioxide
  • Hydrogen
  • Oxygen
  • Nitrogen

42. When lead nitrate is heated, it gives a brown gas. This shows

  • Thermal decomposition
  • Condensation
  • Neutralisation
  • Rusting

43. Which of the following is a physical change with energy absorption?

  • Burning of coal
  • Cooking of food
  • Rusting of iron
  • Melting of ice

44. Rusting of iron is

  • A fast combustion process
  • A slow oxidation process
  • A reversible change
  • A physical process

45. When vinegar and baking soda react, CO₂ forms with fizz. The reaction is

  • Endothermic
  • Exothermic
  • Physical
  • Reversible

46. When wax cools and solidifies, it

  • Releases heat
  • Absorbs heat
  • Changes chemically
  • Expands

47. When we dissolve sugar in water and evaporate,

  • Sugar can be recovered — physical change
  • New substance formed
  • Chemical reaction
  • Irreversible

48. The mass before and after a physical change

  • Increases
  • Decreases
  • Depends on reaction
  • Remains constant

49. In photosynthesis, plants convert CO₂ and water into glucose using sunlight. It is

  • Exothermic change
  • Physical process
  • Endothermic chemical change
  • Temporary

50. When quicklime reacts with water, heat is released. The reaction is

  • Exothermic chemical change
  • Endothermic physical change
  • Reversible
  • Temporary change
Location: Mogalturu, Andhra Pradesh 534281, India

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