CBSE Class 8 Science Friction MCQs

Question. It is difficult to walk on an oily floor because
a) Floor gets spoiled
b) There is more resistance
c) Force of friction is high
d) Force of friction is very less

Answer: D

Question. Spring balance is a device used for measuring the _____________ acting on an object.
a) mass
b) pressure
c) force
d) None of the above

Answer: C

Question. A matchstick struck on a matchbox catches fire easily because
a) Friction may cause fire
b) Of chemical reaction
c) Force heated the match stick
d) None of the above

Answer: A

Question. Tyres are treaded to
a) look good
b) Increase friction
c) increase its longivity
d) increase weight of the tyre

Answer: B

Question. Lubricants are substances which
a) Increase friction
b) Are used to light fire
c) Reduce friction
d) Are used to put out a fire

Answer: C

Question. Sliding friction is _________ than / to rolling friction
a) smaller
b) greater
c) equal
d) None of the above

Answer: A

Question. The frictional force exerted by fluids is also called ______
a) drug
b) drag
c) drop
d) drown

Answer: B

Question. Four children were asked to arrange forces due to rolling, static and sliding frictions in an increasing order. Their arrangements are given below. Choose the correct arrangement.
a) Rolling, Static, Sliding
b) Static, Rolling, Sliding
c) Rolling, sliding, static
d) Sliding, Static, Rolling

Answer: C

Question. A boat or an aeroplane has a pointed or tapering front / head. Why?
a) To increase the friction of fluid
b) To reduce the friction of fluid
c) To look good
d) For no reason

Answer: B

Question. The sole of the shoes becomes plain after wearing it for several months. The reason is
a) Wearing out due to friction
b) Wearing out due to no friction
c) Sole is of bad quality
d) None of the above

Answer: A