engineering mechanics




1).
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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2).
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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3).
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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4).
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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5).
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.

6).
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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7).
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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8).
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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9).
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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10).
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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