Engineering Mechanics MCQ Questions & Answers

41

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body and S = Sum of the squares of the two semi-axes.)

A) $$\frac{{{\text{MS}}}}{3}$$ B) $$\frac{{{\text{MS}}}}{4}$$ C) $$\frac{{{\text{MS}}}}{5}$$ D) None of these

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Answer & Solution

Answer: Option C

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42

Which of the following is not the unit of distance?

A) Angstrom B) Light year C) Micron D) Milestone

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Answer & Solution

Answer: Option D

Solution:

This question asks us to identify which option is not used to measure distance.
Let's look at each option:
Angstrom (Å): This is a very small unit of length, often used to measure the size of atoms and molecules. It's a unit of distance.
Light year (ly): This is a very large unit of distance. It represents the distance light travels in one year. It's a unit of distance.
Micron (µm): Also known as a micrometer, this is a unit of length equal to one millionth of a meter. It's used to measure small distances, making it a unit of distance.
Milestone: A milestone is a marker indicating distance along a road or path. It is not a unit of measurement itself; it's a physical marker showing a point in a distance.

Therefore, Milestone is not a unit of distance. The other options are all units used to measure length or distance.

43

Which of the following is not the unit of pressure?

A) kg/cm B) Bar C) Atmosphere D) Newton

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Answer & Solution

Answer: Option D

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44

The velocity of a particle moving with simple harmonic motion is _________ at the mean position.

A) Zero B) Minimum C) Maximum D) None of these

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Answer & Solution

Answer: Option C

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45

The time of flight (t) of a projectile on an upward inclined plane is
(where u = Velocity of projection, $$\alpha $$ = Angle of projection and $$\beta $$ = Inclination of the plane with the horizontal.)

A) $${\text{t}} = \frac{{{\text{g}}\cos \beta }}{{2{\text{u}}\sin \left( {\alpha - \beta } \right)}}$$ B) $${\text{t}} = \frac{{2{\text{u}}\sin \left( {\alpha - \beta } \right)}}{{{\text{g}}\cos \beta }}$$ C) $${\text{t}} = \frac{{{\text{g}}\cos \beta }}{{2{\text{u}}\sin \left( {\alpha + \beta } \right)}}$$ D) $${\text{t}} = \frac{{2{\text{u}}\sin \left( {\alpha + \beta } \right)}}{{{\text{g}}\cos \beta }}$$

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Answer & Solution

Answer: Option B

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46

One joule is equal to

A) 0.1 N-m B) 1 N-m C) 10 N-m D) 100 N-m

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Answer & Solution

Answer: Option B

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47

One joule means that

A) Work is done by a force of 1 N when it displaces a body through 1 m B) Work is done by a force of 1 kg when it displaces a body through 1 m C) Work is done by a force of 1 dyne when it displaces a body through 1 cm D) Work is done by a force of 1 g when it displaces a body through 1 cm

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Answer & Solution

Answer: Option A

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48

One kg force is equal to

A) 7.8 N B) 8.9 N C) 9.8 N D) 12 N

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Answer & Solution

Answer: Option C

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49

If a body is acted upon by a number of coplanar non-concurrent forces, it may

A) Rotate about itself without moving B) Move in any one direction rotating about itself C) Be completely at rest D) All of these

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Answer & Solution

Answer: Option D

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50

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts.
This statement is known as:

A) Newton's first law of motion B) Newton's second law of motion C) Newton's third law of motion D) None of these

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Answer & Solution

Answer: Option B

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering