NMMS CLASS 7 PHYSICAL AND MACHANICAL CHANGES 7 MEGA TEST FOR 100 MARKS

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NMMS CLASS 7 PHYSICAL AND MACHANICAL CHANGES 7 MEGA TEST FOR 100 MARKS👇



1. Which process changes ice into water?

  • Evaporation
  • Condensation
  • Melting
  • Freezing

2. The gas evolved when zinc reacts with dilute acid is

  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • Hydrogen

3. The process of rusting involves

  • Iron and nitrogen
  • Iron, oxygen, and water
  • Iron and acid
  • Iron and salt

4. When water boils at 100°C, it becomes

  • Ice
  • Air
  • Steam
  • Mist

5. The color of rust is

  • Reddish-brown
  • Yellow
  • Black
  • Green

6. Acids turn blue litmus

  • Green
  • Colourless
  • No change
  • Red

7. Bases taste

  • Sour
  • Sweet
  • Salty
  • Bitter and soapy

8. Photosynthesis is

  • Chemical change
  • Physical change
  • Temporary change
  • Irreversible

9. The reaction between acid and base produces

  • Salt and water
  • Hydrogen
  • Carbon dioxide
  • Oxygen

10. The process of coating iron with zinc is

  • Oxidation
  • Galvanisation
  • Rusting
  • Polishing

11. The heat required to change solid to liquid at constant temperature is

  • Latent heat of fusion
  • Specific heat
  • Conduction
  • Evaporation

12. Burning of fuel is

  • Exothermic
  • Endothermic
  • Reversible
  • Physical

13. The phenomenon of bending of light is called

  • Refraction
  • Reflection
  • Dispersion
  • Scattering

14. Which one is an indicator?

  • Litmus
  • Salt
  • Oxygen
  • Hydrogen

15. Rusting can be prevented by

  • Heating
  • Painting
  • Soaking
  • Scratching

16. The formula of water is

  • H₂O
  • O₂
  • CO₂
  • H₂SO₄

17. The green coating on copper is

  • Basic copper carbonate
  • Copper oxide
  • Copper chloride
  • Copper sulphate

18. Boiling of water is

  • Chemical change
  • Temporary
  • Irreversible
  • Physical change

19. The reaction that absorbs heat is

  • Endothermic
  • Exothermic
  • Neutralisation
  • Temporary

20. The speed of an object is measured in

  • m/s
  • cm²
  • kg/m³
  • N/m

21. Which of these is an acid?

  • Hydrochloric acid
  • Sodium hydroxide
  • Calcium carbonate
  • Salt

22. Which gas turns lime water milky?

  • Carbon dioxide
  • Hydrogen
  • Oxygen
  • Nitrogen

23. When light bounces back from a surface it is called

  • Refraction
  • Dispersion
  • Reflection
  • Absorption

24. The sun’s energy reaches Earth by

  • Conduction
  • Convection
  • Radiation
  • Fusion

25. Iron reacts with moisture to form

  • Rust
  • Salt
  • Oil
  • Water

26. Dissolving salt in water is

  • Physical change
  • Chemical change
  • Temporary
  • Irreversible

27. The process of converting water into vapour is

  • Evaporation
  • Condensation
  • Fusion
  • Freezing

28. The reaction between vinegar and baking soda is

  • Exothermic
  • Physical
  • Endothermic
  • Neutralisation

29. The color of copper sulphate solution is

  • Green
  • Red
  • Yellow
  • Blue

30. When ice melts, heat energy is

  • Released
  • Constant
  • Zero
  • Absorbed

31. A mirror changes direction of light due to

  • Reflection
  • Refraction
  • Dispersion
  • Transmission

32. Bases turn phenolphthalein

  • Pink
  • Colorless
  • Yellow
  • Orange

33. Which of these is a good conductor of heat?

  • Copper
  • Plastic
  • Rubber
  • Wood

34. The unit of temperature in SI system is

  • Celsius
  • Kelvin
  • Fahrenheit
  • Joule

35. When metal reacts with oxygen, it forms

  • Metal chloride
  • Metal carbonate
  • Metal oxide
  • Metal sulphate

36. Which is not a physical change?

  • Cooking rice
  • Boiling water
  • Cutting fruit
  • Melting wax

37. The correct order of states in water cycle is

  • Evaporation → Condensation → Precipitation
  • Condensation → Freezing → Melting
  • Melting → Evaporation → Condensation
  • Condensation → Evaporation → Freezing

38. Vinegar is a weak acid because it contains

  • Citric acid
  • Hydrochloric acid
  • Carbonic acid
  • Acetic acid

39. The process of photosynthesis requires

  • Sunlight
  • Nitrogen
  • Hydrogen
  • Heat

40. The reaction between quicklime and water produces

  • Slaked lime
  • Calcium carbonate
  • Carbon dioxide
  • Hydrogen

41. The color of turmeric in basic medium is

  • Red
  • Yellow
  • Green
  • Orange

42. Rusting is a

  • Chemical change
  • Physical change
  • Temporary
  • Reversible

43. The transfer of heat in solids takes place by

  • Conduction
  • Convection
  • Radiation
  • Reflection

44. In boiling, temperature

  • Remains constant
  • Increases
  • Decreases
  • Becomes zero

45. Baking of bread is a

  • Physical change
  • Reversible
  • Temporary
  • Chemical change

46. When sugar dissolves in water

  • New substance forms
  • Color changes
  • Gas releases
  • No new substance forms

47. Acid rain contains

  • Sulphuric acid
  • Nitric oxide
  • Carbon monoxide
  • Methane

48. The displacement reaction occurs when

  • A more reactive metal replaces a less reactive one
  • Two bases react
  • Two acids react
  • Water is added

49. A rainbow forms due to

  • Dispersion
  • Reflection
  • Diffusion
  • Condensation

50. The pH of neutral substances is

  • 7
  • 0
  • 5
  • 14

51. Burning magnesium ribbon forms

  • Magnesium chloride
  • Magnesium sulphate
  • Hydrogen
  • Magnesium oxide

52. Which of these changes cannot be reversed?

  • Burning wood
  • Melting ice
  • Freezing water
  • Condensing steam

53. Convection of heat occurs in

  • Solids only
  • Vacuum
  • Liquids and gases
  • Metals

54. Bases feel

  • Soapy
  • Oily
  • Rough
  • Smooth

55. Which of the following metals rusts?

  • Iron
  • Gold
  • Aluminium
  • Copper

56. When light passes from air to water, it

  • Goes straight
  • Bends away
  • Bends towards normal
  • Reflects

57. Which of these is an exothermic process?

  • Freezing of water
  • Melting of wax
  • Evaporation
  • Boiling

58. The change from solid directly to gas is

  • Sublimation
  • Condensation
  • Evaporation
  • Fusion

59. Neutralisation reaction is

  • Exothermic
  • Endothermic
  • Reversible
  • Physical

60. When vinegar reacts with baking soda, the gas formed is

  • Carbon dioxide
  • Oxygen
  • Hydrogen
  • Nitrogen

61. The instrument used to measure temperature is

  • Barometer
  • Ammeter
  • Thermometer
  • Hygrometer

62. The transfer of heat without medium is

  • Radiation
  • Conduction
  • Convection
  • Fusion

63. When milk turns sour, it is a

  • Chemical change
  • Physical change
  • Reversible
  • Temporary

64. The speed of light is

  • 3 × 10⁸ m/s
  • 3 × 10⁶ m/s
  • 1 × 10⁸ m/s
  • 3 × 10⁴ m/s

65. The unit of heat energy is

  • Joule
  • Kelvin
  • Watt
  • Newton

66. The gas that supports burning is

  • Nitrogen
  • Carbon dioxide
  • Helium
  • Oxygen

67. Which type of mirror is used in car headlights?

  • Convex mirror
  • Plane mirror
  • Cylindrical mirror
  • Concave mirror

68. When light falls on a plane mirror,

  • Angle of incidence = angle of reflection
  • They differ
  • Always zero
  • Twice the incident

69. A change in which new substance forms is

  • Chemical change
  • Physical change
  • Reversible
  • Temporary

70. Bases neutralise

  • Acids
  • Metals
  • Water
  • Oxygen

71. Melting of wax is

  • Reversible
  • Irreversible
  • Chemical
  • Temporary

72. Photosynthesis is

  • Exothermic
  • Reversible
  • Physical
  • Endothermic

73. Acid + Metal →

  • Salt + Hydrogen
  • Salt + Water
  • Gas + Base
  • Carbon dioxide

74. The gas evolved when carbon reacts with oxygen is

  • Carbon dioxide
  • Nitrogen
  • Hydrogen
  • Methane

75. The instrument used to measure time is

  • Thermometer
  • Scale
  • Clock
  • Barometer

76. Conduction of heat is fastest in

  • Solids
  • Liquids
  • Gases
  • Vacuum

77. When iron reacts with sulphur and is heated, it forms

  • Iron sulphide
  • Iron oxide
  • Iron carbonate
  • Iron hydroxide

78. When ice changes into vapour directly, the process is

  • Evaporation
  • Sublimation
  • Condensation
  • Freezing

79. The process of adding base to acid to form salt is

  • Condensation
  • Oxidation
  • Evaporation
  • Neutralisation

80. The sunlight splits into seven colors due to

  • Dispersion
  • Reflection
  • Refraction
  • Diffusion

81. Acids produce hydrogen ions in

  • Water solution
  • Alcohol
  • Salt
  • Base

82. Boiling point of water is

  • 100°C
  • 0°C
  • 50°C
  • 273°C

83. The formation of curd from milk is caused by

  • Fungi
  • Virus
  • Algae
  • Bacteria

84. Which is a fast chemical change?

  • Burning of fuel
  • Rusting
  • Ripening
  • Souring

85. Bases feel slippery because

  • They react with oils of skin
  • They are dry
  • They are solids
  • They absorb heat

86. The property of metals that allows heat to pass is

  • Conduction
  • Expansion
  • Reflection
  • Flexibility

87. An example of natural acid is

  • Citric acid
  • Sulphuric acid
  • Nitric acid
  • Hydrochloric acid

88. In photosynthesis, plants release

  • Carbon dioxide
  • Nitrogen
  • Oxygen
  • Hydrogen

89. Neutral substances have

  • Equal H⁺ and OH⁻ ions
  • More H⁺
  • More OH⁻
  • No ions

90. Condensation changes gas into

  • Liquid
  • Solid
  • Vapour
  • Ice

91. Heating of sugar produces

  • Water
  • Hydrogen
  • Carbon
  • Nitrogen

92. The time taken to complete one oscillation is

  • Time period
  • Speed
  • Frequency
  • Amplitude

93. The freezing point of water is

  • 0°C
  • 10°C
  • 50°C
  • 100°C

94. Which is a slow change?

  • Rusting
  • Burning
  • Melting
  • Boiling

95. Bases are also known as

  • Alkalis (if soluble)
  • Salts
  • Metals
  • Acids

96. Acid rain damages

  • Buildings and crops
  • Mountains
  • Water
  • Air

97. When water vapour condenses, heat is

  • Absorbed
  • Released
  • Lost forever
  • Stored

98. Motion of pendulum is

  • Periodic
  • Linear
  • Circular
  • Random

99. When metals react with acids,

  • Hydrogen gas evolves
  • Oxygen forms
  • Rust forms
  • Water forms

100. When a solid changes to gas directly, it is

  • Fusion
  • Condensation
  • Evaporation
  • Sublimation
Location: Mogalturu, Andhra Pradesh 534281, India

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