Engineering Mechanics MCQs

Question 1

The resultant of two forces P and Q acting at an angle $$	heta $$ is

Accepted Answer

$$\sqrt {{{	ext{P}}^2} + {{	ext{Q}}^2} + 2{	ext{PQ}}\cos 	heta } $$

Answer

$$\sqrt {{{	ext{P}}^2} + {{	ext{Q}}^2} + 2{	ext{PQ}}\sin 	heta } $$

Answer

$$\sqrt {{{	ext{P}}^2} + {{	ext{Q}}^2} - 2{	ext{PQ}}\cos 	heta } $$

Answer

$$\sqrt {{{	ext{P}}^2} + {{	ext{Q}}^2} - 2{	ext{PQ}}	an 	heta } $$

Question 2

The total energy possessed by a system of moving bodies

Accepted Answer

Is constant at every instant

Answer

Varies from point to point

Answer

Is maximum in the start and minimum at the end

Answer

Is minimum in the start and maximum at the end

Question 3

The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

Accepted Answer

None of these

Answer

Coplanar concurrent forces

Answer

Coplanar non-concurrent forces

Answer

Non-coplanar concurrent forces

Question 4

Which of the following is not the unit of work, energy and heat?

Accepted Answer

h.p

Answer

kcal

Answer

kg-m

Answer

kW-hr

Question 5

The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

Accepted Answer

Repose

Answer

Friction

Answer

Limiting friction

Answer

Kinematic friction

Question 6

The algebraic sum of moments of the forces forming couple about any point in their plane is

Accepted Answer

Equal to the moment of the couple

Answer

Constant

Answer

Both of above are correct

Answer

Both of above are wrong

Question 7

The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is

Accepted Answer

500 N

Answer

20 N

Answer

100 N

Answer

None of these

Question 8

The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

Accepted Answer

Inversely

Answer

Directly

Answer

Square root

Answer

None of these

Question 9

The moment of inertia of a square of side a about its diagonal is

Accepted Answer

$$\frac{{{{	ext{a}}^4}}}{{12}}$$

Answer

$$\frac{{{{	ext{a}}^2}}}{8}$$

Answer

$$\frac{{{{	ext{a}}^3}}}{{12}}$$

Answer

$$\frac{{{{	ext{a}}^4}}}{{16}}$$