Engineering Mechanics – Section 3


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21. In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.

em-se3-21

A. Agree
B. Disagree

Correct Answer: A. Agree
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22. An irregular body may have more than one centre of gravity.

A. Yes
B. No

Correct Answer: B. No
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23. The rate of doing work is known as

A. potential energy
B. kinetic energy
C. power
D. none of these

Correct Answer: C. power
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24. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.

A. True
B. False

Correct Answer: A. True
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25. Moment of inertia of a circular section about its diameter (d) is

A. πd3/16
B. πd3/32
C. πd4/32
D. πd4/64

Correct Answer: D. πd4/64
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26. The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.

A. True
B. False

Correct Answer: A. True
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27. In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

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

Correct Answer: A. less than
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28. The unit of work in S.I. units is

A. Newton
B. Erg
C. kg-m
D. Joule

Correct Answer: D. Joule
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29. The static friction

A. bears a constant ratio to the normal reaction between the two surfaces
B. is independent of the area of contact, between the two surfaces
C. always acts in a direction, opposite to that in which the body tends to move
D. all of the above

Correct Answer: D. all of the above
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30. The maximum height of a projectile on a horizontal plane is

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Correct Answer: Option A
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