Mechanical Engineering - Engineering Mechanics

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

Answer: Option C

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

Answer: Option A

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

Answer: Option B

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

Answer: Option A

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

Answer: Option C

Explanation:

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