Engineering Mechanics MCQs

Question 1

The range of projectile will be maximum for a given velocity of projectile, when the angle of projection ($$\alpha $$) is

Accepted Answer

45° + $$\frac{\beta }{2}$$

Answer

$$\frac{\beta }{2}$$

Answer

30° + $$\frac{\beta }{2}$$

Answer

60° + $$\frac{\beta }{2}$$

Question 2

Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

Accepted Answer

$$\frac{{{	ext{d}}{{	ext{b}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{b}}{{	ext{d}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{d}}{{	ext{b}}^3}}}{{36}}$$

Answer

$$\frac{{{	ext{b}}{{	ext{d}}^3}}}{{36}}$$

Question 3

Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

Accepted Answer

$$\frac{{{	ext{b}}{{	ext{d}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{d}}{{	ext{b}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{d}}{{	ext{b}}^3}}}{{36}}$$

Answer

$$\frac{{{	ext{b}}{{	ext{d}}^3}}}{{36}}$$

Question 4

A smooth cylinder lying on a __________ is in neutral equilibrium.

Accepted Answer

Horizontal surface

Answer

Curved surface

Answer

Convex surface

Answer

None of these

Question 5

The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be

Accepted Answer

20 kg, -ve sense

Answer

20 kg, +ve sense

Answer

10 kg, +ve sense

Answer

10 kg, -ve sense

Question 6

A couple produces

Accepted Answer

Rotational motion

Answer

Translatory motion

Answer

Combined translatory and rotational motion

Answer

None of the above

Question 7

A force acting on a body may

Accepted Answer

All of the above

Answer

Change its motion

Answer

Balance the other forces acting on it

Answer

Retard its motion

Question 8

A force while acting on a body may

Accepted Answer

All of these

Answer

Change its motion

Answer

Balance the forces, already acting on it

Answer

Give rise to the internal stresses in it

Question 9

Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

Accepted Answer

Four times

Answer

Same as

Answer

Twice

Answer

Thrice