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1 . The friction experienced by a body, when in motion, is known as
 A. rolling friction B. dynamic friction C. limiting friction D. static friction

2 . Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a veloci
 A. v B. v/2 C. v/4 D. v/8

3 . The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
 A. sin θ B. cos θ C. tan θ D. cosec θ

4 . A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient
 A. P = W tanα B. P = W tan(α + φ) C. P = W (sinα + μcosα) D. P = W (cosα + μsinα)

5 . If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
 A. 30° B. 60° C. 90° D. 120°

### Aptitude

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