Engineering Mechanics MCQs

Question 1

A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The center of gravity of the section will lie

Accepted Answer

In the shaded area

Answer

In the hole

Answer

At ‘O’

Answer

None of these

Question 2

A framed structure is perfect if it contains members equal to (where, n = number of joints in a frame)

Accepted Answer

2n3

Answer

2n

Answer

n2

Answer

3n2

Question 3

The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

Accepted Answer

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

Answer

D + d

Answer

D - d

Answer

D × d

Question 4

A screw jack used for lifting the loads is

Accepted Answer

A non-reversible machine

Answer

A reversible machine

Answer

An ideal machine

Answer

None of these

Question 5

The maximum velocity of a particle moving with simple harmonic motion is

Accepted Answer

$$\omega {	ext{r}}$$

Answer

$$\omega $$

Answer

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

Answer

$$\frac{\omega }{{	ext{r}}}$$

Question 6

A particle inside a hollow sphere of radius r, having coefficient of friction μ can rest up to height of

Accepted Answer

0.134 r

Answer

$$\frac{{	ext{r}}}{2}$$

Answer

$$\frac{{	ext{r}}}{{	ext{A}}}$$

Answer

$$\frac{{	ext{r}}}{3}$$

Question 7

The centre of gravity of a uniform lamina lies at

Accepted Answer

The midpoint of its axis

Answer

The centre of heavy portion

Answer

The bottom surface

Answer

All of the above

Question 8

The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

Accepted Answer

More than

Answer

Less than

Answer

Equal to

Answer

None of these

Question 9

The coefficient of restitution for inelastic bodies is

Accepted Answer

Zero

Answer

One

Answer

Between zero and one

Answer

More than one