# Mechanical Engineering - Engineering Mechanics

### Exercise :: Engineering Mechanics - Section 6

6.

Joule is the unit of

 A. force B. work C. power D. velocity

Explanation:

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7.

The force induced in the string AB due to the load W, as shown in the below figure is

 A. W sin θ B. W cos θ C. W sec θ D. W cosec θ

Explanation:

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8.

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

 A. MS/3 B. MS/4 C. MS/5 D. none of these

Explanation:

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9.

The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

 A. coplaner concurrent forces B. coplaner non-concurrent forces C. like parallel forces D. unlike parallel forces

Explanation:

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10.

The efficiency of a lifting machine is the ratio of

 A. output to the input B. work done by the machine to the work done on the machine C. mechanical advantage to the velocity ratio D. all of the above