Q53 of 139 Page 21

One of the following is not a vector quantity. This one is :

A. displacement B. speed


C. acceleration D. velocity

displacement , acceleration and velocity are vector quantity.

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51

When a car driver travelling at a speed of 20 m/s applies brakes and brings the car to rest in 40 s, then retardation will be :

A. + 2 m/s2


B. -2 m/s2


C. - 0.5 m/s2


D. + 0.5 m/s2

 52

Which of the following could not be a unit of speed?

A. km/h B. s/m


C. m/s D. mm s-1

 54

Which of the following could not be a unit of acceleration?

A. km/s2


B. cm s2


C. km/s


D. m/ s2

 55

A body is moving along a circular path of a radius R. What will be the distance travelled and displacement of the body when it completes a revolution?