# Mechanical Engineering - Engineering Mechanics

### Exercise :: Engineering Mechanics - Section 1

46.

Work done is said to be zero, when

 A. some force acts on a body, but displacement is zero B. no force acts on a body but some displacement takes place C. either (a) or (b) D. none of the above

Explanation:

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47.

The force which acts along the radius of a circle and directed away from the centre of the circle is called centrifugal force.

 A. Agree B. Disagree

Explanation:

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48.

One watt is equal to

 A. 0.1 joule/s B. 1 joule/s C. 10 joules/s D. 100 joules/s

Explanation:

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49.

two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

 A. 15 N and 5 N B. 20 N and 5 N C. 15 N and 15 N D. none of these

Explanation:

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50.

If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is __________ the momentum of body having mass m2.

 A. equal to B. less than C. greater than