Engineering Mechanics MCQs

Question 1

A framed structure, as shown in the below figure, is a

Accepted Answer

Perfect frame

Answer

Deficient frame

Answer

Redundant frame

Answer

None of the above

Question 2

Effect of a force on a body depends upon

Accepted Answer

All of the above

Answer

Magnitude

Answer

Direction

Answer

Position or line of action

Question 3

If the gravitational acceleration at any place is doubled, then the weight of a body will be

Accepted Answer

2g

Answer

$$\frac{{	ext{g}}}{2}$$

Answer

g

Answer

$$\sqrt 2 \,{	ext{g}}$$

Question 4

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

Accepted Answer

Non-reversible machine

Answer

Reversible machine

Answer

Neither reversible nor non-reversible machine

Answer

Ideal machine

Question 5

Which is the correct statement about law of polygon of forces?

Accepted Answer

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

Answer

If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

Answer

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

Answer

If a polygon representing forces acting at a point is closed then forces are in equilibrium

Question 6

Which of the following is an equation of linear motion? (where, u and v = Initial and final velocity of the body, a = Acceleration of the body and s = Displacement of the body in time t seconds.)

Accepted Answer

All of these

Answer

v = u + at

Answer

s = ut + $$\frac{1}{2}$$ at2

Answer

v2 = u2 + 2as

Question 7

The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

Accepted Answer

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

Answer

$$\frac{{{	ext{m}}{{	ext{r}}^2}}}{4}$$

Answer

$$\frac{{{	ext{m}}{{	ext{r}}^2}}}{6}$$

Answer

$$\frac{{{	ext{m}}{{	ext{r}}^2}}}{8}$$

Question 8

If three forces acting in different planes can be represented by a triangle, these will be in

Accepted Answer

Non-equilibrium

Answer

Partial equilibrium

Answer

Full equilibrium

Answer

Unpredictable

Question 9

The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

Accepted Answer

$$\frac{{2{	ext{D}}}}{{{{	ext{d}}_1} - {{	ext{d}}_2}}}$$

Answer

$$\frac{{	ext{D}}}{{{{	ext{d}}_1} + {{	ext{d}}_2}}}$$

Answer

$$\frac{{	ext{D}}}{{{{	ext{d}}_1} - {{	ext{d}}_2}}}$$

Answer

$$\frac{{2{	ext{D}}}}{{{{	ext{d}}_1} + {{	ext{d}}_2}}}$$