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Mechanical Engineering Objective Questions { Engineering Mechanics }

176. A body is thrown vertically upwards with a velocity of 980 cm/sec then the time the body will take to reach the ground will be
A.1 sec
B.2 sec
C.2.5 sec
D.4 sec
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177. A body is thrown vertically upwards from the ground with a speed of 980 cm/sec. It will rise to a height of
A.980 cm
B.490 cm
C.49 cm
D.10 cm
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178. A stone falls from the top of a building 200 m high and at the same time another is projected vertically upwards with a velocity of 50 m/sec, then the two will meet
A.After 1 sec
B.After 2 sec
C.After 4 sec
D.After 5 sec
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179. A ball is dropped vertically downward from the top of a building and another one is thrown horizontally. Which will strike ground first
A.One dropped vertically
B.One thrown horizontally
C.Both will strike simultaneously
D.It will depend on their mass
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180. A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of velocity after rebounding
A.4 metres
B.3 metres
C.2 metres
D.1 metre
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181. A 6 m long rope of weight 0.5 kg/m is hanging freely from a support. The work done in lifting up the rope upto the support point will be
A.6 kg-m
B.18 kg-m
C.9 kg-m
D.12 kg-m
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182. A boatman rowing his boat at normal speed takes 12 minutes to cover 2 kilometers downstream, while rowing up stream at the same speed he takes 20 minutes to cover the same distance. The normal speed of the boat is
A.2 kilometres/hour
B.4 kilometres/hour
C.6 kilometres/hour
D.8 kilometres/hour
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