Engineering Mechanics MCQ Questions & Answers

71

The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is

A) $$\frac{{\text{h}}}{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}$$ B) $$\frac{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}{{\text{h}}}$$ C) $$\frac{{{{\text{h}}^2}}}{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}$$ D) $$\frac{{{\text{k}}_{\text{G}}^2 + {{\text{h}}^2}}}{{{{\text{h}}^2}}}$$

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Answer & Solution

Answer: Option B

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72

When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.

A) Directly proportional B) Inversely proportional C) Cube root D) None of these

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Answer & Solution

Answer: Option A

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73

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

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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74

Angle of friction is the

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

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Answer: Option A

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75

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

A) $$\frac{{\text{g}}}{2}$$ B) $$\frac{{\text{g}}}{3}$$ C) $$\frac{{\text{g}}}{4}$$ D) None of these

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Answer & Solution

Answer: Option D

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76

A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation

A) 6t² - 8t B) 3t² + 2t C) 6f - 8 D) 6f - 4

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Answer & Solution

Answer: Option C

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77

When two elastic bodies collide with each other,

A) The two bodies will momentarily come to rest after collision B) The two bodies tend to compress and deform at the surface of contact C) The two bodies begin to regain their original shape D) All of the above

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Answer & Solution

Answer: Option D

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78

A number of forces acting at a point will be in equilibrium, if

A) All the forces are equally inclined B) Sum of all the forces is zero C) Sum of resolved parts in the vertical direction is zero (i.e. ∑V = 0) D) None of these

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Answer & Solution

Answer: Option C

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79

The moment of inertia of a square of side (a) about an axis through its center of gravity is

A) $$\frac{{{{\text{a}}^4}}}{4}$$ B) $$\frac{{{{\text{a}}^4}}}{8}$$ C) $$\frac{{{{\text{a}}^4}}}{{12}}$$ D) $$\frac{{{{\text{a}}^4}}}{{36}}$$

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Answer & Solution

Answer: Option C

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80

The below figure shows the two equal forces at right angles acting at a point. The value of force ‘R’ acting along their bisector and in opposite direction is
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) $$\frac{{\text{P}}}{2}$$ B) 2P C) $$\sqrt 2 \,{\text{P}}$$ D) $$\frac{{\text{P}}}{{\sqrt 2 }}$$

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Answer: Option C

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering