AP 8th Physical Science Mock Test 2023 For Chapter – 2 : ” Friction ” Online Practice Test

1. Using of lubricants or ball bearings causes ............... in friction

2. True statement

3. Which is not true ?

4. Friction depends on which factors ?

5. Find the correct statement

6. 10 kg brick with dimensions 502520 cm placed horizontally on the floor . The static friction id 'f ' . What happened to static friction when it placed vertically n the floor ?

7. Friction produces .............

8. The material required to perform an activity to observe the effect of contact force on friction are

9. Identify friction force direction

10. In which of the following cases , drag doesn't exist

11. Friction depends on

12. Sprinkling powder on carrom board __________ is the friction

13. Identify true statement

14. The friction in the cycle is chain ................. by adding oil

15. On which of the above components that friction depends ?

16. Friction is independent of

17. To overcome friction ............ are used in machinery

18. Friction produces

19. The friction exerted by moving body is called

20. The friction acting on the body which is at rest is

21. The friction exerted by fluid is called

22. The friction which is least among all the frictions

23. The friction exerted by a rolling body is

24. The friction opposes the ................... between surfaces in contact

25. Friction depends on the ............. of surfaces

26. Friction produces

27. Sprinkling of powder on the carrom board .............friction

28. Sliding friction is ................ than the static friction

29. Friction is ............... of area of contact

30. Friction can be decreased by using

31. Friction is.............. to normal force

32. _____________ is called necessary evil

33. The maximum frictional force offered by a surface can be measured by using

34. As the normal force increases frictional force exerted by body is

35. The special shapes of birds reduce

36. ................. irregularities increases friction

37. To light a match stick we need ................ force

38. To light a match stick we need ................ force

39. Match the following

1. Static friction   ( ) a. Object in motion
2. Sliding friction ( ) b. Ball bearings
3. Rolling friction ( ) c. Object at rest

40. Match the following

1. Fluid friction   ( ) a. Decrease the friction
2. Friction            ( ) b. Nature of surface
3. Lubricants       ( ) c. Drag

41. Match the following

1. Normal force           ( ) a. Increase the friction
2. Area of contact        ( ) b. Friction is independent
3. Shape of birds         ( ) c. Produces heat
4. Friction                     ( ) d. To overcome fluid pressure

42. ......................... is the friction which comes into play when surface of one object moves relative to the other surface of another object

43. What purpose are served by bearings in machines ?

44. The force applied by the floor on the object moving is called

45. Which of the following is false statement about frictional force ?

46. ............................ is the friction which comes into play when surfaces of objects are at rest relative to each other

47. ............................ is the friction which comes into play when surfaces of one object moves relative to surface of another object

48. When one body rolls over the surface of the other body he friction offered is called

49. Write the order of friction

50. The substances which reduce friction are called

51. What are the factors which influence friction ?

52. The frictional force exerted by fluid is called

53. The frictional force of an object in a fluid depends on

54. If friction was absent can you light a match stick ?

55. Hard metal balls are used  between rolling parts in a machine . How does it reduces friction ?

56. A car moving on a concrete road entered on glacier . The driver applied brakes . Describe its motion

57. Why do we use grease between moving parts of motor vehicles ?

58. What is effect of roughness on frictions ?

59. Why do Gymnasts apply some coarse substances on their hands ?

60. What is the effect of area of contact on frictional force ?

61. Why do we need to change the tyres when its threading is worn out ?

62. Why shape of aeroplane is similar to birds ?

63. Required materials for understanding rolling friction are

64. What is the conclusion on the principal of ball bearings ?

65. In ball bearings activity the top lid can easily rotate because

66. Which force is responsible for stopping the rotation of water ?

67. Where do you think scientists get hint for the special shapes like aeroplanes ?

68. Why do we pour a few drops of oil on the hinges of a door ?

69. Which of the following move easily and fastly ?

70. Cars , trucks tyres are threaded . why ?

71. The devices which reduce friction between rotating shafts of machine tools is

72. Which of them are fluids ?

73. The frictional force exerted by fluids is called

74. Fluid friction is

75. Find the evil of friction

76. What are the advantages of friction ?

77. Explain why sportsman use shoes with spikes ?

78. What conditions are needed for static friction to come into play ?

79. Which of the following is practical application of static friction ?

80. Which of the following is example for showing the existence of sliding friction ?

81. We can measure frictional force by using ____________ in some situations

82. Ways of reducing friction

83. ........... are used in machinery

84. ........... are used in automobiles and aeroplanes

85. .................... decreasing irregularities of surface

86. Does friction act on a table resting on the floor ?

87. Can we reduce friction to zero?

88. What are th forces acting on book in horizontal direction ?

89. Push a heavy box which is kept on a floor and it does not move first , after increasing the applied force it moves . Can you guess the reason why it does not move first ?

90. Push a heavy box which is kept on a floor and it does not move first , after increasing the applied force it moves . Can you guess when does the box tends to move?

91. Find the false statement ?

92. Find the false one

93. Find the true statement

94. Find true statement

95. It is used for

96. A : Gymnast apply some coarse substance for a better grip
B : The substance which increase friction is called lubricants

97. A : Ball bearings used in machinery
B : Automobiles and aeroplanes are steam lined to reduce friction

98. A : There is no need of friction in transport
B : We can reduce the friction to zero

99. A : Static friction < Sliding friction < Rolling friction
B : If friction is absent we can light match stick

100. It represents the