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
Which shape will have minimum friction in a fluid?
  • A
    Circular tips
  • B
    Pointed tips
    Correct
  • C
    Parabolic tips
  • D
    Rectangular tips
2
Frictional force is necessary in
  • A
    Using matchstick
    Correct
  • B
    Playing carom
  • C
    Pushing heavy load
  • D
    Accelerating the car
3
Fluids are
  • A
    Liquids only
  • B
    Gases only
  • C
    Semisolids only
  • D
    Liquids and gases
    Correct
4
What does air resistance do to falling objects?
  • A
    Make them rise
  • B
    Slows down them
    Correct
  • C
    Speeds them up
  • D
    Increase its mass
5
Which of the following objects have low friction?
  • A
    Wicket keeper gloves
  • B
    Car tyres
  • C
    Ice skates
  • D
    Goal keeper gloves
    Correct
6
The direction of friction is always __________ to the direction in which the object is moving.
  • A
    Equal
  • B
    Opposite
    Correct
  • C
    Unrelated
  • D
    Perpendicular
7
Friction between any two objects is due to
  • A
    Repulsion between them
  • B
    Even surfaces of them
  • C
    Attraction between them
  • D
    Surface irregularities on them
    Correct
8
A force of ____________ acts when an object moves through air or water.
  • A
    Friction
    Correct
  • B
    Acceleration
  • C
    Reacceleration
  • D
    Weight
9
Carpenters often grease screws before fixing them to
  • A
    Increase friction
  • B
    Make it light weight
  • C
    Decrease friction
    Correct
  • D
    Maintain friction
10
A body is rolling over the ground the body or sliding over the same ground. In which case, the friction will be more?
  • A
    There is no friction in both case
  • B
    When sliding
    Correct
  • C
    Equal in both case
  • D
    When rolling
11
Streamlining is
  • A
    Making tips thin
    Correct
  • B
    making back thin
  • C
    making back thick
  • D
    making tips thick
12
Ball bearing is used in cycles because
  • A
    Rolling friction is less than sliding friction
    Correct
  • B
    Ball is used to make attractive
  • C
    Ball bearing increase the wheel size
  • D
    Rolling friction is more than sliding friction
13
The SI unit of frictional force is
  • A
    Watt
  • B
    Newton
    Correct
  • C
    Pascal
  • D
    Joule
14
A car with worn out treads on tyres is more likely to skid due to
  • A
    More friction
  • B
    Less weight of tyres
  • C
    Smaller size of tyres
  • D
    Less friction
    Correct
15
It is difficult to move a cycle with brakes on because
  • A
    Friction increases
    Correct
  • B
    Brakes increase the mass
  • C
    Friction decreases
  • D
    Brakes make the cycle frictionless