Engineering Mechanics MCQs

Question 1

The velocity ratio of a first system of pulleys with 4 pulleys is

Accepted Answer

16

Answer

4

Answer

8

Answer

20

Question 2

A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

Accepted Answer

96 m

Answer

38 m

Answer

62.5 m

Answer

124 m

Question 3

A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

Accepted Answer

62.5 m

Answer

38 m

Answer

96 m

Answer

124 m

Question 4

The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

Accepted Answer

$$\frac{{2\pi {	ext{N}}}}{{60}}$$

Answer

$$\frac{{\pi {	ext{N}}}}{{60}}$$

Answer

$$\frac{{\pi {	ext{N}}}}{{180}}$$

Answer

$$\frac{{2\pi {	ext{N}}}}{{180}}$$

Question 5

A cable with a uniformly distributed load per horizontal meter run will take the following shape

Accepted Answer

Parabola

Answer

Straight line

Answer

Hyperbola

Answer

Elliptical

Question 6

The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

Accepted Answer

$$\frac{{2{	ext{D}}}}{{{	ext{D}} - {	ext{d}}}}$$

Answer

$$\frac{{	ext{D}}}{{{	ext{D}} - {	ext{d}}}}$$

Answer

$$\frac{{	ext{D}}}{{{	ext{D}} + {	ext{d}}}}$$

Answer

$$\frac{{2{	ext{D}}}}{{{	ext{D}} + {	ext{d}}}}$$

Question 7

The center of gravity of a trapezium with parallel sides 'a' and 'b' lies at a distance of 'y' from the base 'b', as shown in the below figure. The value of 'y' is

Accepted Answer

$$\frac{{	ext{h}}}{3}\left( {\frac{{2{	ext{a}} + {	ext{b}}}}{{{	ext{a}} + {	ext{b}}}}} ight)$$

Answer

$${	ext{h}}\left( {\frac{{2{	ext{a}} + {	ext{b}}}}{{{	ext{a}} + {	ext{b}}}}} ight)$$

Answer

$$\frac{{	ext{h}}}{2}\left( {\frac{{2{	ext{a}} + {	ext{b}}}}{{{	ext{a}} + {	ext{b}}}}} ight)$$

Answer

$$\frac{{	ext{h}}}{3}\left( {\frac{{{	ext{a}} + {	ext{b}}}}{{2{	ext{a}} + {	ext{b}}}}} ight)$$

Question 8

Which of the following statement is incorrect?

Accepted Answer

The velocity ratio of a machine is the ratio of load lifted to the effort applied

Answer

A force acting in the opposite direction to the motion of the body is called force of friction

Answer

The ratio of the limiting friction to the normal reaction is called coefficient of friction

Answer

A machine whose efficiency is 100% is known as an ideal machine

Question 9

The length of a second's pendulum is

Accepted Answer

99.4 cm

Answer

94.9 cm

Answer

100 cm

Answer

101 cm