CBSE Questions for Class 8 Physics Friction Quiz 7 - MCQExams.com

Why are vehicle tires treaded?
  • To increase friction.
  • To decrease friction.
  • To multiply friction.
  • To decrease grip.
Frictional force between two surface in contact is due the 
  • Adhesive force between the molecules
  • Cohesive force between the molecules
  • Repulsive forces between the molecules
  • Both $$2$$ and $$3$$
Galileo did his experiments on inclined planes with smooth surfaces and observed that
  • As smoother the surface, the farther the ball traveled
  • As rough the surface, the farther the ball traveled
  • As smoother the surface, the nearer the ball traveled
  • None of these
The interlocking of the depressions and elevations (irregularities) present on the surfaces of the bodies in contact cause friction.
  • True
  • False
  • Ambiguous
  • Data Insufficient
Consider the following statements:
Statement A: Frictional force depends on the static states of the body .
Statement B: Frictional force only depends on the physical property of two moving substances when they are in contact.
Which of the following statements are correct ?
  • Statement A is correct
  • Statement B is correct
  • Statement A and B are correct
  • Statement A and B are incorrect
  • None of these
How does the use of fine powder on carrom-board affect the friction?
  • Reduces
  • Increases
  • Neither increases nor decreases.
  • None of these
Friction does not depend on the nature of the surface in contact.
  • True
  • False
  • Ambiguous
  • Data Insufficient
Sand is spread on the track covered with snow to 
  • Reduce coefficient of friction between road and tyre
  • Increase coefficient of friction between road and tyre
  • Increase area of contact between road and tyre
  • Decrease area of contact between road and tyre
state whether friction between two surfaces
  • Prevents the relative motion between them
  • Opposite to the direction of motion on them
  • Acts in opposite direction of applied force
  • Both (b) and (c)
Which of these is/are different type/s of friction?
  • Static friction
  • Sliding friction
  • Rolling friction
  • All of these
Which of the following are the factors on which fluid friction depends on?
  • Speed of an object
  • Shape of an object
  • Nature of the fluid
  • All of these
Choose whether true or false:-
Sliding friction is greater than static friction
  • True
  • False
The strength with which an object is pressed on a surface is also a factor affecting friction.
  • True
  • False
Choose whether true or false:-
Objects loose energy when they move in a fluid.
  • True
  • False
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