Engineering Mechanics MCQ Questions & Answers

11

Center of gravity of a thin hollow cone lies on the axis at a height of

A) One-fourth of the total height above base B) One-third of the total height above base C) One-half of the total height above base D) Three-eighth of the total height above the base

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Answer & Solution

Answer: Option B

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12

The time of flight of a projectile on downward inclined plane depends upon

A) Angle of projection B) Angle of inclination of the plane C) Both (A) and (B) D) None of these

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Answer & Solution

Answer: Option C

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13

In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

A) 50 B) 100 C) 200 D) 400

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Answer & Solution

Answer: Option B

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14

The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

A) Equal to B) Less than C) Greater than D) None of these

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Answer & Solution

Answer: Option A

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15

A block of mass m₁, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m₂, which moves vertically downwards as shown in the below figure. The tension in the string is
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) $$\frac{{{{\text{m}}_1}}}{{{{\text{m}}_2}}}$$ B) $${{\text{m}}_1}{\text{g}}\sin \alpha $$ C) $$\frac{{{{\text{m}}_1}{{\text{m}}_2}}}{{{{\text{m}}_1} + {{\text{m}}_2}}}$$ D) $$\frac{{{{\text{m}}_1}{{\text{m}}_2}{\text{g}}\left( {1 + \sin \alpha } \right)}}{{{{\text{m}}_1} + {{\text{m}}_2}}}$$

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Answer & Solution

Answer: Option D

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16

Which of the following is not the unit of energy?

A) kg m B) kcal C) Watt D) Watt hours

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Answer & Solution

Answer: Option C

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17

Which one of the following statements is not correct?

A) The tangent of the angle of friction is equal to coefficient of friction B) The angle of repose is equal to angle of friction C) The tangent of the angle of repose is equal to coefficient of friction D) The sine of the angle of repose is equal to coefficient to friction

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Answer & Solution

Answer: Option D

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18

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

A) $$\frac{\pi }{{16}}\left( {{{\text{D}}^2} - {{\text{d}}^2}} \right)$$ B) $$\frac{\pi }{{16}}\left( {{{\text{D}}^3} - {{\text{d}}^3}} \right)$$ C) $$\frac{\pi }{{32}}\left( {{{\text{D}}^4} - {{\text{d}}^4}} \right)$$ D) $$\frac{\pi }{{64}}\left( {{{\text{D}}^4} - {{\text{d}}^4}} \right)$$

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Answer & Solution

Answer: Option D

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19

The forces, whose lines of action are parallel to each other and act in the same directions, are known as

A) Coplanar concurrent forces B) Coplanar non-concurrent forces C) Like parallel forces D) Unlike parallel forces

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Answer & Solution

Answer: Option C

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20

The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

A) sinθ B) cosθ C) tanθ D) cosecθ

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Answer & Solution

Answer: Option A

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering