225. If a system in equilibrium consists of six equal concurrent coplanar forces, each force acting in a different direction, then the angle between any pair of fordes is
A.30°
B.45°
C.60°
D.75°

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226. Choose the correct statement
A.No acceleration is produced in the body when it moves with a constant speed along a circle
B.No work gets done on it when it moves with a constant speed along a circle
C.No force acts on the body when the body moves with a constant speed along a circle
D.Its velocity remains constant when the body moves with a constant speed along a circle

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227. A bucket of water weighing 10 kg is pulled up from a well 20 metre deep by a rope weighing 1 kg/m length, then the work done is
A.200 kg-m
B.400 kg-m
C.500 kg-m
D.600 kg-m

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228. A ship will sink if it does not displace water equal to its own
A.Volume
B.Density
C.Surface area
D.Weight

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229. If the momentum of a given particle is doubled then its kinetic energy will
A.Be halved
B.Be doubled
C.Be quadrupled
D.Be same

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230. The atmosphere of earth is retained due to
A.Gravitational pull of earth
B.Mean speed of molecules being much less than the escape velocity
C.As a result of cohesion, adhesion, osmosis etc.
D.Spherical shape of earth

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231. If two bodies, one light and other heavy, have equal kinetic energy, which one has a greater momentum
A.The heavy body
B.The light body
C.Both have equal momentum
D.Unpredictable

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