Engineering Mechanics – Section 5


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21. The angle which the normal reaction makes with the resultant reaction is called the angle of friction.

A. Agree
B. Disagree

Correct Answer: A. Agree
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22. Which of the following statement is correct?

A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation,
B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.
C. The velocity of the particle moving with simple harmonic motion is zero at the mean position.
D. The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.

Correct Answer: A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation,
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23. The law of the machine is(where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

A. P = mW – C
B. P = m/W + C
C. P = mW + C
D. P = C – mW

Correct Answer: C. P = mW + C
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24. In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.

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A. half
B. equal to
C. double

Correct Answer: A. half
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25. The velocity of a body on reaching the ground from a height h is

A. 2.√(gh)
B. √(gh)
C. √(2gh)
D. 2g.√h

Correct Answer: C. √(2gh)
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26. The moment of the force P about O as shown in the below figure is

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A. P x OA
B. P x OB
C. P x OC
D. P x AC

Correct Answer: C. P x OC
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27. According to lami’s theorem

A. the three forces must be equal
B. the three forces must be at 120° to each other
C. the three forces must be in equilibrium
D. if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Correct Answer: D. if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
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28. Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about XX axis.

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A. two times
B. same
C. half

Correct Answer: A. two times
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29. The amplitude is always __________ radius of the circle.

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

Correct Answer: A. equal to
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30. When a body falls freely under gravitational force, it possesses __________ weight.

A. no
B. minimum
C. maximum

Correct Answer: A. no
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