# MCQ Questions for Class 8 Science Chapter 12 Friction

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## MCQ Questions for Class 8 Science Chapter 12 Friction

Here we are providing mcq questions for class 8 science. In this article, we are covering Class 8 Science Chapter 12 Friction.

Q.1 Force of friction is directly proportional to
(A) size
(B) area
(C) weight
(D) all these factors of the moving body

Q.2 Which of the following is the least ?
(A) static friction
(B) sliding friction
(C) rolling friction
(D) limiting friction

Q.3 Friction between two flat surface can be reduced by,
(A) greasing
(B) using ball bearing
(C) decreasing the area
(D) All of the above

Q.4 The flying machine offering the least frictional force should be
(A) irregular
(B) tree-like
(C) symmetrical with many arms
(D) streamlined

Q.5 Frictional force increases with the increase in
(A) roughness of the surface
(B) smoothness of the surface
(C) distance between two bodies
(D) none of these

Q.6 Lubrication of moving surfaces
(A) removes friction
(B) reduces friction
(C) increases friction
(D) has no effect on friction

Q.7 Frictional force is due to between two moving surfaces
(A) softness
(B) roughness
(C) distance
(D) none of these

Q.8 The maximum value of force required to make the body just to slide is known as
(A) dynamic friction
(B) static friction
(C) limiting friction
(D) rolling friction

Q.9 Rolling friction is always more than the
(A) dynamic friction
(B) static friction
(C) limiting friction
(D) none of these

Q.10 What can you use to reduce the force of friction on an object?
(A) Lubricate the surface
(B) Streamline the body shape
(C) Reduce the surface area in contact of two bodies
(D) All of these

Q.11 Which of the statement is correct about rolling and sliding friction?
(A) Rolling friction is greater than sliding friction
(B) Rolling friction is lesser than sliding friction
(C) Rolling and sliding frictions acting on a body are equal
(D) None of these

Q.12 A body will experience the minimum friction in –
(A) Vacuum
(B) Air
(C) Fresh water
(D) Sea water

Q.13 Ball bearings are used to
(A) increase surface area
(B) decrease surface area
(C) increase friction
(D) decrease friction

Q.14 Lubricants are used to
(A) reduce friction
(B) increase friction
(C) make a surface shiny
(D) make a surface oily

Q.15 SI unit of force of friction is
(A) N
(B) kg wt
(C) kg m/s2
(D) Joule

Q.16 Ball bearings are used to
(A) increase friction
(B) decrease friction
(C) optimize friction
(D) remain same

Q.17 The use of lubricants makes the surface
(A) smooth
(B) rough
(C) very rough
(D) no effect

Q.18 The frictional force …… with the in roughness of the surfaces
(A) increases, increase
(B) decrease, decrease
(C) decrease, increase
(D) increases, decrease

Q.19 The maximum force of friction when the body is just beginning to move is known as the
(A) limiting friction
(B) rolling friction
(C) static friction
(D) none of these

Q.20 The friction that exists between a surface sliding on another surface is called the
(A) dynamic friction
(B) rolling friction
(C) static friction
(D) none of these