Engineering Mechanics MCQs

Question 1

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

Accepted Answer

$${\omega ^2}{	ext{y}}$$

Answer

$$\omega {	ext{y}}$$

Answer

$$\frac{{{\omega ^2}}}{{	ext{y}}}$$

Answer

$${\omega ^3}{	ext{y}}$$

Question 2

The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted and C = Another constant which represents the machine friction.)

Accepted Answer

P = mW + C

Answer

P = mW - C

Answer

P = $$\frac{{	ext{m}}}{{	ext{W}}}$$ + C

Answer

P = C - mW

Question 3

A machine having an efficiency greater than 50%, is known as

Accepted Answer

Reversible machine

Answer

Non-reversible machine

Answer

Neither reversible nor non-reversible machine

Answer

Ideal machine

Question 4

The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis. (where h = Height of a right circular solid cone.)

Accepted Answer

$$\frac{{	ext{h}}}{4}$$

Answer

$$\frac{{	ext{h}}}{2}$$

Answer

$$\frac{{	ext{h}}}{3}$$

Answer

$$\frac{{	ext{h}}}{6}$$

Question 5

The time of flight (t) of a projectile on a horizontal plane is given by

Accepted Answer

$${	ext{t}} = \frac{{2{	ext{u}}\sin \alpha }}{{	ext{g}}}$$

Answer

$${	ext{t}} = \frac{{2{	ext{u}}\cos \alpha }}{{	ext{g}}}$$

Answer

$${	ext{t}} = \frac{{2{	ext{u}}	an \alpha }}{{	ext{g}}}$$

Answer

$${	ext{t}} = \frac{{2{	ext{u}}}}{{{	ext{g}}\sin \alpha }}$$

Question 6

The range of a projectile is maximum, when the angle of projection is

Accepted Answer

45°

Answer

30°

Answer

60°

Answer

90°

Question 7

In actual machines

Accepted Answer

Mechanical advantage is less than velocity ratio

Answer

Mechanical advantage is greater than velocity ratio

Answer

Mechanical advantage is equal to velocity ratio

Answer

Mechanical advantage is unity

Question 8

If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

Accepted Answer

All the above are correct

Answer

Meet in a point

Answer

Be all parallel

Answer

At least two of them must meet

Question 9

In ideal machines

Accepted Answer

Mechanical advantage is equal to velocity ratio

Answer

Mechanical advantage is greater than velocity ratio

Answer

Mechanical advantage is less than velocity ratio

Answer

Mechanical advantage is unity