Friction MCQs – Part 1

Practice SSC JE and other civil engineering exam questions on friction: limiting friction, coefficient and angle of friction, angle of repose, measuring road surface friction, and related problems on ropes and pulleys. Tap an option to check it, then open the full explanation for each question.

Question 1Medium

Which instrument is used for the measurement of the longitudinal coefficient of friction (of a road surface)?

Full explanation

Answer: C. Roughometer

The answer given for this question is the roughometer. The bump integrator measures surface unevenness, not friction.

Question 2Easy

The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as:

Full explanation

Answer: B. Limiting friction

The maximum value of static friction, just before sliding, is limiting friction: F = μR.

Question 3Easy

The angle of inclination of the plane at which a body begins to move down the plane is called:

Full explanation

Answer: C. Angle of repose

The inclination at which a body just starts to slide under its own weight is the angle of repose; it equals the angle of friction.

Question 4Hard

Two persons of equal weight are hanging by their hands from the ends of a rope passing over a frictionless pulley. They begin to climb. One person can climb at twice the speed of the other. Who gets to the top first?

Full explanation

Answer: B. Both get there together

The rope tension is the same on both sides and the masses are equal, so both have the same upward acceleration at every instant and reach the top together.