169. In simple harmonic motion, acceleration of a particle is proportional to
A.Rate of change of velocity
B.Displacement
C.Velocity
D.Direction

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170. One joule is equal to
A.10^2 erg
B.10^7 erg
C.10^5 erg
D.10^4 erg

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171. Joule is the unit of
A.Force
B.Work
C.Power
D.Energy

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172. A body of mass M falling freely under the action of gravity has following weight
A.M
B.Zero
C.M/2
D.M + gM

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173. Which one is a unit of time
A.Half year
B.Angstrom
C.Light year
D.Micron

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174. The principle of conservation of energy can't be applied in the following case
A.Body sliding down a rough inclined plane
B.Simple pendulum
C.Flow through a venturi tube
D.A particle moving in a gravitational field

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175. A body of mass m moving with a constant velocity v hits another body of the same mass moving with the same velocity v but in opposite direction and sticks to it, then the velocity of the compound body after collision is
A.Zero
B.v/2
C.4v
D.2v

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