Engineering Mechanics MCQ Questions & Answers

1

On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

A) Towards the wall at its upper end B) Away from the wall at its upper end C) Upwards at its upper end D) Downwards at its upper end

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Answer & Solution

Answer: Option C

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2

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

A) Downwards at its upper end B) Upwards at its upper end C) Perpendicular to the wall at its upper end D) Zero at its upper end

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Answer & Solution

Answer: Option D

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3

Lami's theorem states that

A) Three forces acting at a point will be in equilibrium B) Three forces acting at a point can be represented by a triangle, each side being proportional to force C) If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium D) If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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Answer & Solution

Answer: Option D

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4

Moment of inertia of a circular section about its diameter (d) is

A) $$\frac{{\pi {{\text{d}}^3}}}{{16}}$$ B) $$\frac{{\pi {{\text{d}}^3}}}{{32}}$$ C) $$\frac{{\pi {{\text{d}}^4}}}{{32}}$$ D) $$\frac{{\pi {{\text{d}}^4}}}{{64}}$$

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Answer & Solution

Answer: Option D

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5

The range of projectile (R) on an upward inclined plane is

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

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Answer & Solution

Answer: Option D

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6

If a number of forces are acting at a point, their resultant will be inclined at an angle $$\theta $$ with the horizontal, such that

A) $$\tan \theta = \frac{{\sum {\text{H}} }}{{\sum {\text{V}} }}$$ B) $$\tan \theta = \frac{{\sum {\text{V}} }}{{\sum {\text{H}} }}$$ C) $$\tan \theta = \sum {{\text{V}} \times \sum {\text{H}} } $$ D) $$\tan \theta = \sqrt {\sum {{\text{V}} + \sum {\text{H}} } } $$

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Answer & Solution

Answer: Option B

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7

Two coplanar couples having equal and opposite moments

A) Balance each other B) Produce a couple and an unbalanced force C) Are equivalent D) Cannot balance each other

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Answer & Solution

Answer: Option D

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8

Limiting force of friction is the

A) Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction B) Ratio of limiting friction and normal reaction C) The friction force acting when the body is just about to move D) The friction force acting when the body is in motion

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Answer & Solution

Answer: Option C

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9

Coulomb friction is the friction between

A) Bodies having relative motion B) Two dry surfaces C) Two lubricated surfaces D) Solids and liquids

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Answer & Solution

Answer: Option B

Solution:

Coulomb friction, also known as dry friction, is the friction that occurs between two dry surfaces in contact with each other. It is called "dry" friction because it applies to surfaces without any lubrication or liquid film between them.

Therefore, the correct answer is Option B: Two dry surfaces. This option accurately describes the type of surfaces between which Coulomb friction occurs. Coulomb friction is a fundamental concept in engineering mechanics and is commonly encountered in various mechanical systems and applications.

Options A, C, and D do not correctly describe the nature of Coulomb friction.

10

The slope on the road surface generally provided on the curves is known as

A) Angle of friction B) Angle of repose C) Angle of banking D) None of these

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Answer & Solution

Answer: Option C

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering