Mechanical Engineering

Question: 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:

No answer description available for this question.

Question: Joule is the unit of
[A].

force

[B].

work

[C].

power

[D].

velocity

Answer: Option B

Explanation:

No answer description available for this question.

Question: One joule means that
[A].

work is done by a force of 1 N when it displaces a body through 1m

[B].

work is done by a force of 1 kg when it displaces a body through 1 m

[C].

work is done by a force of 1 dyne when it displaces a body through 1 cm

[D].

work is done by a force of 1 g when it displaces a body through 1 cm

Answer: Option A

Explanation:

No answer description available for this question.

Question: Onejoule is equal to
[A].

0.1 N-m

[B].

1 N-m

[C].

10 N-m

[D].

100 N-m

Answer: Option B

Explanation:

No answer description available for this question.

Question: A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of
[A].

1m

[B].

2m

[C].

3m

[D].

4m

Answer: Option B

Explanation:

No answer description available for this question.

Question: A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
[A].

v

[B].

2v

[C].

4v

[D].

8v

Answer: Option B

Explanation:

No answer description available for this question.

Question: A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
[A].

both the balls undergo an equal change in momentum

[B].

the change in momentum suffered by rubber ball is more than the lead ball

[C].

the change in momentum suffered by rubber ball is less than the lead ball

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.
[A].

equal to

[B].

equal and opposite to

[C].

less than

[D].

greater than

Answer: Option B

Explanation:

No answer description available for this question.

Question: In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: The bodies which rebound after impact are called
[A].

inelastic bodies

[B].

elastic bodies

[C].

neither elastic nor inelastic bodies

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.