Engineering Mechanics MCQs

Question 1

The moment of a force

Accepted Answer

All of the above

Answer

Is the turning effect produced by a force, on the body, on which it acts

Answer

Is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force

Answer

Is equal to twice the area of the triangle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken

Question 2

The motion of a wheel of a car is

Accepted Answer

Combined translation and rotational

Answer

Purely translation

Answer

Purely rotational

Answer

None of these

Question 3

The rate of doing work is known as

Accepted Answer

Power

Answer

Potential energy

Answer

Kinetic energy

Answer

None of these

Question 4

Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

Accepted Answer

20 N

Answer

40 N

Answer

120 N

Answer

None of these

Question 5

The static friction

Accepted Answer

All of the above

Answer

Bears a constant ratio to the normal reaction between the two surfaces

Answer

Is independent of the area of contact, between the two surfaces

Answer

Always acts in a direction, opposite to that in which the body tends to move

Question 6

In the shown figure, the tension (T) in the string will be

Accepted Answer

$$\frac{{2{{	ext{m}}_1}{{	ext{m}}_2}{	ext{g}}}}{{{{	ext{m}}_1} + {{	ext{m}}_2}}}$$

Answer

$$\frac{{{{	ext{m}}_1}{{	ext{m}}_2}{	ext{g}}}}{{{{	ext{m}}_1} + {{	ext{m}}_2}}}$$

Answer

$$\frac{{{{	ext{m}}_1} + {{	ext{m}}_2}}}{{{{	ext{m}}_1}{{	ext{m}}_2}{	ext{g}}}}$$

Answer

$$\frac{{{{	ext{m}}_1} + {{	ext{m}}_2}}}{{2{{	ext{m}}_1}{{	ext{m}}_2}{	ext{g}}}}$$

Question 7

The term 'Centroid' is

Accepted Answer

The same as centre of gravity

Answer

The point of suspension

Answer

The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

Answer

None of the above

Question 8

Two blocks ‘A’ and ‘B’ of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.

Accepted Answer

Will

Answer

Will not

Answer

Either A or B

Answer

None of these

Question 9

The unit of angular acceleration is

Accepted Answer

rad/s2

Answer

N-m

Answer

m/s

Answer

m/s2