Engineering Mechanics MCQs

Question 1

The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

Accepted Answer

4r/ 3π

Answer

3r/ 8

Answer

8r/3

Answer

3r/4π

Question 2

The motion of a particle round a fixed axis is

Accepted Answer

circular

Answer

translatory

Answer

rotary

Answer

translatory as well as rotatry

Question 3

The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Accepted Answer

minimum, if it acts at the centre of gravity of the body

Answer

same at every point on its line of action

Answer

different at different points on its line of action

Answer

maximum, if it acts at the centre of gravity of the body

Question 4

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

Accepted Answer

ω2r

Answer

ω

Answer

ωr

Answer

ω/r

Question 5

Non-coplaner concurrent forces are those forces which

Accepted Answer

meet at one point, but their lines of action do not lie on the same plane

Answer

do not meet at one point and their lines of action do not lie on the same plane

Answer

meet at one point and their lines of action also lie on the same plane

Answer

do not meet at one point, but their lines of action lie on the same plane

Question 6

Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

Accepted Answer

bh3/ 12

Answer

bh3/4

Answer

bh3/8

Answer

bh3/ 36

Question 7

According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

Accepted Answer

the algebraic sum of their moments about any point in their plane is zero

Answer

their algebraic sum is zero

Answer

their lines of action are at equal distances

Answer

the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

Question 8

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

Accepted Answer

ω2.y

Answer

ω.y

Answer

ω2 /y

Answer

ω3.y

Question 9

Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then

Accepted Answer

the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point.

Answer

their algebraic sum is zero

Answer

their lines of action are at equal distances

Answer

the algebraic sum of their moments about any point in their plane is zero