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Civil Engineering Objective Questions { Applied Mechanics }

134. If a ball which is dropped from a height of 2.25 m on a smooth floor attains the height of bounce equal to 1.00 m, the coefficient of the restitution between the ball and floor, is
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135. A ball moving with a velocity of 5 misec impinges a fixed plane at an angle of 45? and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be
A. 0.5 m/sec
B. 1.5 m/sec
C. 2.5 m/sec
D. 3.5 m/sec
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136. Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down
A. rubber and lead balls undergo equal changes in momentum
B. chanw in momentum suffered by lead ball is less that of rubber ball
C. momentum of rubber ball is less than that of lead ball
D. none of these.
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137. Pick up the correct statement from the following. The kinetic energy of a body
A. before impact is equal to that after impact
B. before impact is less than that after impact
C. before impact is more than that after impact
D. remains constant
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138. Newtons's Law of Motion is :
A. Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
C. To every action, there is always an equal and opposite reaction
D. All the above.
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139. The inherent property of a body which offers reluctance to change its state of rest or uniform motion, is
A. weight
B. mass
C. interia
D. momentum.
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140. The unit of force in C.G.S. system of units, is called
A. dyne
B. Newton
C. kg
D. all the above.
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