# Civil Engineering - Applied Mechanics

### Exercise :: Applied Mechanics - Section 4

16.

In simple harmonic motion, acceleration of a particle is proportional to

 A. rate of change of velocity B. displacement C. velocity D. direction E. none of these.

Explanation:

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17.

A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if

 A. floor is smooth and the wall is rough B. floor is rough and the wall is smooth C. floor and wall both are smooth surfaces D. floor and wall both are rough surfaces.

Explanation:

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18.

In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is

 A. 1.5 B. 5 C. 25 D. 314

Explanation:

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19.

To double the period of oscillation of a simple pendulum

 A. the mass of its bob should be doubled B. the mass of its bob should be quadrupled C. its lenght should be quadrupled D. its length should be doubled.

Explanation:

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20.

For a particle moving with a simple harrmonic motion, the frequency is

 A. directly proportional to periodic time B. inversely proportional to periodic time C. inversely proportional to its angular velocity D. directly proportional to its angular velocity E. none of these.