Civil Engineering - Applied Mechanics

46. 

Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after impact would be

A. zero
B. 5 m/sec
C. 10 m/sec
D. none of these.

Answer: Option C

Explanation:

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47. 

Equation of motion of a point in a straight line, is

A. v = u + ft
B. S = ut + ft2
C. 2fS = v2 - u2
D. all the above.

Answer: Option D

Explanation:

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48. 

For the system of the loads shown in below figure, the time required for the 6.6 kg load to fall on the edge, is

A. 1 sec.
B. 2 sec.
C. 3 sec.
D. 4 sec.
E. 5 sec.

Answer: Option C

Explanation:

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49. 

One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is

A. 17.5 kg
B. 19.5 kg
C. 22.5 kg
D. 25 kg.

Answer: Option C

Explanation:

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50. 

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.

Answer: Option C

Explanation:

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