Engineering Mechanics – Section 3


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11. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by(where δ = Deflection of the spring.)

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Correct Answer: Option B
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12. The angle of inclination with the vertical is __________ if the cyclist is running at a faster speed than that when he is running at a slower speed.

A. more
B. less

Correct Answer: A. more
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13. The range of projectile(R) on an upward inclined plane is

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Correct Answer: Option D
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14. The center of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis. (where h = Height of a right circular solid cone.)

A. h/2
B. h/3
C. h/4
D. h/6

Correct Answer: C. h/4
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15. In actual machines, mechanical advantage is __________ velocity ratio.

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

Correct Answer: B. less than
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16. The radius of gyration is the distance where the whole mass (or area) of a body is assumed to be concentrated.

A. Correct
B. Incorrect

Correct Answer: A. Correct
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17. If three coplanar forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.

A. Correct
B. Incorrect

Correct Answer: A. Correct
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18. 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

Correct Answer: B. 2m
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19. In the shown figure, the tension (T) in the string will be

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Correct Answer: Option B
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20. When the spring of a watch is wound, it will possess

A. strain energy
B. kinetic energy
C. heat energy
D. electrical energy

Correct Answer: A. strain energy
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