Class 8 Friction CBSE Questions & Answers

Class 8 · Friction

This is Science Class 8 Friction CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The threaded tyres of cars, trucks and bus
  • A
    Increase the velocity of vehicles
  • B
    Increase the diameter
  • C
    Provide better grips with ground
    Correct
  • D
    Decrease friction of ground
2
It is easier to hold a earthen pot than steel pot as
  • A
    Earthen pot has more friction
    Correct
  • B
    Steel pot is comparatively heavier
  • C
    Steel pot has more friction
  • D
    Earthen pot has less friction
3
Carpenters often grease screws before fixing them to
  • A
    Make it light weight
  • B
    Increase friction
  • C
    All of the above
  • D
    Decrease friction
    Correct
4
Which of the following is a contact force?
  • A
    Static force
  • B
    Muscular
  • C
    Friction
    Correct
  • D
    Elastic force
5
The shape of fish is streamlined to
  • A
    Decrease fluid friction
    Correct
  • B
    Increase fluid friction
  • C
    Change the direction
  • D
    Facilitate breathing
6
In which of the following activities friction is useful?
  • A
    Walking on ground
    Correct
  • B
    Wearing and tearing of shoe sole
  • C
    Heating of moving bodies
  • D
    Movement of machine
7
A body will remain in state of motion on rolling on ground if
  • A
    All of the above
  • B
    Friction is absent
    Correct
  • C
    Friction is acting on same direction
  • D
    Friction is very large
8
Soapy water on floor would make it
  • A
    More clean
  • B
    More hygienic
  • C
    Difficult to walk
    Correct
  • D
    Easier to walk
9
Which shape is useful for movement in fluid?
  • A
    Streamlined shape
    Correct
  • B
    Ring shaped
  • C
    Point shaped
  • D
    Dumbbell shape
10
Which of the following will offer least friction to run a toy car?
  • A
    Dry marble
  • B
    News paper
  • C
    Wet marble
    Correct
  • D
    Towel
11
Which of the following is characteristic of friction?
  • A
    It can change the direction of motion
  • B
    It is a non-contact force
  • C
    It works on only resting body
  • D
    It works opposite to direction of motion
    Correct
12
Which of the following is known as friends as well as enemy?
  • A
    Force
  • B
    Speed
  • C
    Friction
    Correct
  • D
    Motion
13
Sliding is replaced in most machines by
  • A
    Using lubricants
  • B
    Using powder
  • C
    Use of ball bearings
    Correct
  • D
    Using graphite
14
Brakes of vehicle is stopped by using brake that works on property of
  • A
    Friction
    Correct
  • B
    Pressure
  • C
    Retardation
  • D
    Acceleration
15
Friction is caused by the
  • A
    Irregularities on the two surface in contact
    Correct
  • B
    Smoothness on two surface in contact
  • C
    Holes in two surfaces in contact
  • D
    Irregularities in one surface only