## engineering mechanics ###### According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
 A True B False
 ANS: B - False

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###### The friction experienced by a body, when in motion, is known as
 A rolling friction B dynamic friction C limiting friction D static friction
 ANS: B - dynamic friction

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###### 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 velocity
 A v B v/2 C v/4 D v/8
 ANS: B - v/2

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###### The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
 A Agree B Disagree
 ANS: A - Agree

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###### The coefficient of restitution for elastic bodies is one.
 A Correct B Incorrect
 ANS: B - Incorrect

Coefficient of restitution for elastic bodies is 0 - 1. Coefficient of restitution for perfect elastic bodies is 1.

###### 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
 ANS: A - sin θ

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###### The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.
 A less than B more than C equal to
 ANS: B - more than

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###### The angle of inclination of a vehicle when moving along a circular path __________ upon its mass.
 A depends B does not depend
 ANS: B - does not depend

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###### 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 of friction between the plane and the body
 A P = W tanα B P = W tan(α + φ) C P = W (sinα + μcosα) D P = W (cosα + μsinα)
 ANS: C - P = W (sinα + μcosα)

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###### 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°
 ANS: D - 120°

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