Engineering Mechanics MCQ Questions & Answers

21

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

A) $$\omega $$ B) $$\omega {\text{r}}$$ C) $${\omega ^2}{\text{r}}$$ D) $$\frac{\omega }{{\text{r}}}$$

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Answer & Solution

Answer: Option C

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22

A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A) Remain horizontal B) Slant up towards direction of pull C) Slant down towards direction of pull D) None of the above

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Answer & Solution

Answer: Option C

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23

When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.

A) Inward B) Outward C) Towards front D) Towards back

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Answer & Solution

Answer: Option A

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24

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

A) Their algebraic sum is zero B) Their lines of action are at equal distances C) The algebraic sum of their moments about any point in their plane is zero D) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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Answer & Solution

Answer: Option D

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25

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

A) Their algebraic sum is zero B) Their lines of action are at equal distances C) The algebraic sum of their moments about any point in their plane is zero D) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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Answer & Solution

Answer: Option C

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26

The necessary condition for forces to be in equilibrium is that these should be

A) Coplanar B) Meet at one point C) Both (A) and (B) above D) All be equal

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Answer & Solution

Answer: Option C

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27

The acceleration 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 A

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28

The motion of a particle round a fixed axis is

A) Translatory B) Rotary C) Circular D) Translatory as well as rotary

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Answer & Solution

Answer: Option C

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29

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A) 30° B) 60° C) 90° D) 120°

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Answer & Solution

Answer: Option D

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30

Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is
Engineering Mechanics mcq question image

A) $$\frac{{{\text{B}}{{\text{D}}^3}}}{{12}} - \frac{{{\text{b}}{{\text{d}}^3}}}{{12}}$$ B) $$\frac{{{\text{D}}{{\text{B}}^3}}}{{12}} - \frac{{{\text{d}}{{\text{b}}^3}}}{{12}}$$ C) $$\frac{{{\text{B}}{{\text{D}}^3}}}{{36}} - \frac{{{\text{b}}{{\text{d}}^3}}}{{36}}$$ D) $$\frac{{{\text{D}}{{\text{B}}^3}}}{{36}} - \frac{{{\text{d}}{{\text{b}}^3}}}{{36}}$$

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Answer & Solution

Answer: Option A

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering