Civil Engineering - Applied Mechanics

21. 

A stone of mass 1 kg is tied to a string of length 1 m and whirled in a horizontal circle at a constant angular speed 5 rad/sec. The tension in the string is,

A. 5 N
B. 10 N
C. 15 N
D. 25 N
E. None of these.

Answer: Option D

Explanation:

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22. 

For a simple pendulum, time period for a beat, is

A. πl/g
B. π2l/g
C. πg/2l
D. πl/2g
E. π2g/l.

Answer: Option A

Explanation:

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23. 

The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is

A. 1/4
B. 1/2
C. 3/4
D. 2.

Answer: Option A

Explanation:

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24. 

The apparent weight of a man in a moving lift is less than his real weight when it is going down with

A. uniform speed
B. an acceleration
C. linear momentum
D. retardation.

Answer: Option B

Explanation:

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25. 

P is the force acting on a body whose mass is m and acceleration is f. The equation P - mf = 0, is known as

A. equation of dynamics
B. equation of dynamic equilibrium
C. equation of statics
D. none of these.

Answer: Option A

Explanation:

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