Mechanical Engineering - Engineering Mechanics

1. 

The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

A. D + d
B. D - d
C. D x d
D. D / d

Answer: Option D

Explanation:

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2. 

The unit of force in S.I. system of units is

A. dyne
B. kilogram
C. newton
D. watt

Answer: Option C

Explanation:

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3. 

The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is

A. 3mr2/5
B. 3mr2/10
C. 2mr2/5
D. 4mr2/5

Answer: Option B

Explanation:

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4. 

A body is said to move or vibrate with simple harmonic motion if its acceleration is directed towards the mean position.

A. True
B. False

Answer: Option A

Explanation:

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5. 

A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

A. downward at its upper end
B. upward at its upper end
C. zero at its upper end
D. perpendicular to the wall at its upper end

Answer: Option C

Explanation:

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