Engineering Mechanics MCQ Questions & Answers

11

The wheels of a moving car possess

A) Potential energy only B) Kinetic energy of translation only C) Kinetic energy of rotation only D) Kinetic energy of translation and rotation both

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Answer & Solution

Answer: Option D

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12

The below figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) $$\frac{{\text{P}}}{{\sin \beta }} = \frac{{\text{Q}}}{{\sin \alpha }} = \frac{{\text{R}}}{{\sin \gamma }}$$ B) $$\frac{{\text{P}}}{{\sin \alpha }} = \frac{{\text{Q}}}{{\sin \beta }} = \frac{{\text{R}}}{{\sin \gamma }}$$ C) $$\frac{{\text{P}}}{{\sin \gamma }} = \frac{{\text{Q}}}{{\sin \alpha }} = \frac{{\text{R}}}{{\sin \beta }}$$ D) $$\frac{{\text{P}}}{{\sin \alpha }} = \frac{{\text{Q}}}{{\sin \gamma }} = \frac{{\text{R}}}{{\sin \beta }}$$

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Answer & Solution

Answer: Option B

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13

If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

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

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Answer: Option A

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14

A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

A) P = W tanα B) P = W tan (α + φ) C) P = W (sinα + μcosα) D) P = W (cosα + μsinα)

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Answer & Solution

Answer: Option C

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15

The law of motion involved in the recoil of gun is

A) Newton's first law of motion B) Newton's second law of motion C) Newton's third law of motion D) None of these

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Answer & Solution

Answer: Option C

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16

The moment of inertia of a thin rod of mass 'm' and length '$$l$$', about an axis through its centre of gravity and perpendicular to its length is

A) $$\frac{{{\text{m}}{l^2}}}{4}$$ B) $$\frac{{{\text{m}}{l^2}}}{6}$$ C) $$\frac{{{\text{m}}{l^2}}}{8}$$ D) $$\frac{{{\text{m}}{l^2}}}{{12}}$$

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Answer & Solution

Answer: Option D

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17

The center of gravity of a triangle lies at the point of

A) Concurrence of the medians B) Intersection of its altitudes C) Intersection of bisector of angles D) Intersection of diagonals

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Answer & Solution

Answer: Option A

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18

The maximum efficiency of a lifting machine is

A) $$\frac{1}{{\text{m}}}$$ B) $$\frac{{{\text{VR}}}}{{\text{m}}}$$ C) $$\frac{{\text{m}}}{{{\text{VR}}}}$$ D) $$\frac{1}{{{\text{mVR}}}}$$

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Answer & Solution

Answer: Option D

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19

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

A) Static friction B) Dynamic friction C) Limiting friction D) Coefficient of friction

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Answer & Solution

Answer: Option C

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20

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

A) P + Q B) P - Q C) $$\frac{{\text{P}}}{{\text{Q}}}$$ D) $$\frac{{\text{Q}}}{{\text{P}}}$$

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Answer & Solution

Answer: Option B

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering