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Engineering Machanics Questions and Answers

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Exercise

Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5

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Q 1
A machine having an efficiency less than 50%, is known as

A)   reversible machine

B)   non-reversible machine

C)   neither reversible nor non-reversible machine

D)   ideal machine

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Correct Option - B

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Q 2
Which of the following statement is correct?

A) The kinetic energy of a body during impact remains constant.

B) The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.

C) The kinetic energy of a body before impact is less than the kinetic energy of a body after impact.

D) The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.

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Correct Option - D

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Q 3
Concurrent forces are those forces whose lines of action

A)   lie on the same line

B)   meet at one point

C)   meet on the same plane

D)   none of these

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Correct Option - B

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Q 4
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

A)   less than

B)   greater than

C)  


D)  


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Correct Option - B

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Q 5
The force which acts along the radius of a circle and directed towards the centre of the circle is known as centripetal force.

A)   True

B)   False

C)  


D)  


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Correct Option - A

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Q 6
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

A) area of the triangle

B) twice the area of the triangle

C) half the area of the triangle

D) none of these

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Correct Option - B

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Q 7
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

A) Newton's first law of motion

B) Newton's second law of motion

C) principle of conservation of energy

D) principle of conservation of momentum

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Correct Option - D

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