Engineering Mechanics MCQ Questions & Answers

61

A force acting on a body may

A) Change its motion B) Balance the other forces acting on it C) Retard its motion D) All of the above

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Answer & Solution

Answer: Option D

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62

A force while acting on a body may

A) Change its motion B) Balance the forces, already acting on it C) Give rise to the internal stresses in it D) All of these

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Answer & Solution

Answer: Option D

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63

Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

A) Same as B) Twice C) Thrice D) Four times

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Answer & Solution

Answer: Option D

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64

According to Lami’s theorem

A) The three forces must be equal B) The three forces must be at 120° to each other C) The three forces must be in equilibrium D) If the three forces acting at a point are in equilibrium, then 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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65

According to principle of moments

A) If a system of coplanar forces is in equilibrium, then their algebraic sum is zero B) If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero C) The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point D) Positive and negative couples can be balanced

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Answer & Solution

Answer: Option B

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66

The velocity of a body on reaching the ground from a height h, is

A) $$2\sqrt {{\text{gh}}} $$ B) $$\sqrt {{\text{gh}}} $$ C) $$\sqrt {2{\text{gh}}} $$ D) $$2{\text{g}}\sqrt {\text{h}} $$

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Answer & Solution

Answer: Option C

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67

The force induced in the string AB due to the load W, as shown in the below figure is
Engineering Mechanics mcq question image

A) W sinθ B) W cosθ C) W secθ D) W cosecθ

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Answer & Solution

Answer: Option D

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68

An ideal machine is one whose efficiency is

A) Between 60 and 70 % B) Between 70 and 80% C) Between 80 and 90% D) 100%

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Answer & Solution

Answer: Option D

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69

A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

A) The floor is smooth, the wall is rough B) The floor is rough, the wall is smooth C) The floor and wall both are smooth surfaces D) The floor and wall both are rough surfaces

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Answer & Solution

Answer: Option C

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70

In the equation of virtual work, following force is neglected

A) Reaction of any smooth surface with which the body is in contact B) Reaction of a rough surface of a body which rolls on it without slipping C) Reaction at a point or an axis, fixed in space, around which a body is constrained to turn D) All of the above

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Answer & Solution

Answer: Option D

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering