Engineering Mechanics MCQs

Question 1

The units of moment of inertia of mass are

Accepted Answer

kg-m2

Answer

m2/kg

Answer

kg/m2

Answer

kg/m

Question 2

Mass moment of inertia of a uniform thin rod of mass (M) and length ($$l$$) about its mid-point and perpendicular to its length is

Accepted Answer

$$\frac{1}{{12}}{	ext{M}}{l^2}$$

Answer

$$\frac{2}{3}{	ext{M}}{l^2}$$

Answer

$$\frac{1}{3}{	ext{M}}{l^2}$$

Answer

$$\frac{3}{4}{	ext{M}}{l^2}$$

Question 3

Forces are called concurrent when their lines of action meet in

Accepted Answer

One point

Answer

Two points

Answer

Plane

Answer

Perpendicular planes

Question 4

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Accepted Answer

Coplanar concurrent forces

Answer

Coplanar non-concurrent forces

Answer

Non-coplanar concurrent forces

Answer

Non-coplanar non-concurrent forces

Question 5

If u1 and u2 are the velocities of two moving bodies in the same direction before impact and v1 and v2 are their velocities after impact, then coefficient of restitution is given by

Accepted Answer

$$\frac{{{{	ext{v}}_2} - {{	ext{v}}_1}}}{{{{	ext{u}}_1} - {{	ext{u}}_2}}}$$

Answer

$$\frac{{{{	ext{v}}_1} - {{	ext{v}}_2}}}{{{{	ext{u}}_1} - {{	ext{u}}_2}}}$$

Answer

$$\frac{{{{	ext{u}}_1} - {{	ext{u}}_2}}}{{{{	ext{v}}_1} - {{	ext{v}}_2}}}$$

Answer

$$\frac{{{{	ext{u}}_2} + {{	ext{u}}_1}}}{{{{	ext{v}}_2} + {{	ext{v}}_1}}}$$

Question 6

A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

Accepted Answer

2v

Answer

v

Answer

4v

Answer

8v

Question 7

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.)

Accepted Answer

$$\frac{{{	ext{MS}}}}{5}$$

Answer

$$\frac{{{	ext{MS}}}}{3}$$

Answer

$$\frac{{{	ext{MS}}}}{4}$$

Answer

None of these

Question 8

Which of the following is not the unit of distance?

Accepted Answer

Milestone

Answer

Angstrom

Answer

Light year

Answer

Micron

Question 9

Which of the following is not the unit of pressure?

Accepted Answer

Newton

Answer

kg/cm

Answer

Bar

Answer

Atmosphere