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
On applying force, an object start moving when
  • A
    Frictional force and applied force act in same direction
  • B
    Applied force is less than static force
  • C
    Applied force is equal to static force
  • D
    Applied force is more than static force
    Correct
2
What does air resistance does to falling objects?
  • A
    Slows down them
    Correct
  • B
    Speeds them up
  • C
    Make them rise
  • D
    Increase its mass
3
On rough surfaces, friction is
  • A
    Absent
  • B
    Almost absent
  • C
    Less
  • D
    More
    Correct
4
The force required to keep the object moving with same speed is a measure of
  • A
    Contact friction
  • B
    Sliding friction
    Correct
  • C
    Static friction
  • D
    Rolling friction
5
Interlocking of irregularities on two surface in contact cause
  • A
    Friction
    Correct
  • B
    Temperature
  • C
    Pressure
  • D
    Force
6
Drag is the
  • A
    Frictional force exerted by liquid
    Correct
  • B
    Frictional force exerted by air
  • C
    Gravitational force exerted by liquid
  • D
    Frictional force exerted by solid
7
The force required to overcome friction at the instant an object start moving from rest is measure of
  • A
    Dragging friction
  • B
    Sliding friction
  • C
    Rolling friction
  • D
    Static friction
    Correct
8
What does air resistance does to falling objects?
  • A
    Make them rise
  • B
    Speeds them up
  • C
    Increase its mass
  • D
    Slows down them
    Correct
9
The bottom of stainless steel pan have copper because
  • A
    Copper is easier to clean
  • B
    Copper is more durable
  • C
    Copper is better conductor
    Correct
  • D
    Copper is more attractive
10
A car with worn out treads on tyres is more likely to skid due to
  • A
    Less weight of tyres
  • B
    Less friction
    Correct
  • C
    More friction
  • D
    Smaller size of tyres
11
The force by which earth attract the other body is called
  • A
    Muscular force
  • B
    Gravitational force
    Correct
  • C
    Contact force
  • D
    Magnetic force
12
It is difficult to walk of smooth surface due to
  • A
    Absolute friction
  • B
    More friction
  • C
    Less friction
    Correct
  • D
    Without friction
13
Which of the following device is used to reduce friction?
  • A
    Spike
  • B
    Sole
  • C
    Ball bearing
    Correct
  • D
    Hook
14
Which of the following have more friction?
  • A
    Rough road
    Correct
  • B
    Glass
  • C
    Plane table top
  • D
    Marble floor
15
In which of the following case, friction is useful?
  • A
    Movement of machine
  • B
    Tearing of shoes
  • C
    Pushing of heavy box on floor
  • D
    Walking on road
    Correct