Engineering Mechanics MCQ with Answers Pdf Free Download

1. The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

A. 50 mm

B. 75 mm

C. 87.5 mm

D. 125 mm

Answer: Option C

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2. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

A. mr^2/3

B. 2mr^2/3

C. 2mr^2/5

D. 3mr^2/5

Answer: Option B

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3. Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

A. 15 N and 5 N

B. 20 N and 5 N

C. 15 N and 15 N

D. None of these

Answer: Option A

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4. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is

A. 5

B. 10

C. 20

D. 40

Answer: Option B

5. In order to double the period of simple pendulum, the length of the string should be

A. Halved

B. Doubled

C. Quadrupled

D. None of these

Answer: Option C

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6. The impact between two lead spheres is approximately equal to an

__________ impact.

A. Elastic

B. Inelastic

C. Solid

D. None of these

Answer: Option B

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7. The matter contained in a body, is called

A. Impulsive force

B. Mass

C. Weight

D. Momentum

Answer: Option B

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9. Moment of inertia is the

A. Second moment of force

B. Second moment of area

C. Second moment of mass

D. All of these

Answer: Option D

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10. The total motion possessed by a body, is called

A. Impulsive force

B. Mass

C. Weight

D. Momentum

Answer: Option D

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Engineering Mechanics MCQ with Answers Pdf Free Download

12. A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Answer & Solution

A. Remain horizontal

B. Slant up towards direction of pull

C. Slant down towards direction of pull

D. None of the above

Answer: Option C

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13. When a person, on a bicycle, drives round a curve, he has to lean

__________ to maintain equilibrium.

A. Inward

B. Outward

C. Towards front

D. Towards back

Answer: Option A

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14. Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

A. Their algebraic sum is zero

B. Their lines of action are at equal distances

C. The algebraic sum of their moments about any point in their plane is zero

D. The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

Answer: Option D

15. According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

A. Their algebraic sum is zero

B. Their lines of action are at equal distances

C. The algebraic sum of their moments about any point in their plane is zero

D. The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

Answer: Option C

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16. The necessary condition for forces to be in equilibrium is that these should be

A. Coplanar

B. Meet at one point

C. Both (A) and (B) above

D. All be equal

Answer: Option C

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17. The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

Answer: Option A

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18. The motion of a particle round a fixed axis is

A. Translatory

B. Rotary

C. Circular

D. Translatory as well as rotary

Answer: Option C

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19. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A. 30°

B. 60°

C. 90°

D. 120°

Answer: Option D

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21. If a rigid body is in equilibrium under the action of three forces, then

A. These forces are equal

B. The lines of action of these forces meet in a point

C. The lines of action of these forces are parallel

D. Both (B) and (C) above

Answer: Option D

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22. If a number of forces act simultaneously on a particle, it is possible

A. Not a replace them by a single force

B. To replace them by a single force

C. To replace them by a single force through C.G.

D. To replace them by a couple

Answer: Option B

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23. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

A. 1 m

B. 2 m

C. 3 m

D. 4 m

Answer: Option B

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24. The centre of percussion of the homogeneous rod of length ‘L’ suspended

at the top will be

A. L/2

B. L/3

C. 3L/4

D. 2L/3

Answer: Option D

25. The units of moment of inertia of mass are

A. kg-m^2

B. m^2/kg

C. kg/m^2

D. kg/m

Answer: Option A

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27. Forces are called concurrent when their lines of action meet in

A. One point

B. Two points

C. Plane

D. Perpendicular planes

Answer: Option A

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28. The forces, which meet at one point and their lines of action also lie on the same plane, are known as

A. Coplanar concurrent forces

B. Coplanar non-concurrent forces

C. Non-coplanar concurrent forces

D. Non-coplanar non-concurrent forces

Answer: Option A

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30. A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

A. v

B. 2v

C. 4v

D. 8v

Answer: Option B

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32. Which of the following is not the unit of distance?

A. Angstrom

B. Light year

C. Micron

D. Milestone

Answer: Option D

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33. Which of the following is not the unit of pressure?

A. kg/cm

B. Bar

C. Atmosphere

D. Newton

Answer: Option D

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34. The velocity of a particle moving with simple harmonic motion is

_________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

Answer: Option C

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36. One joule is equal to

A. 0.1 N-m

B. 1 N-m

C. 10 N-m

D. 100 N-m

Answer: Option B

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37. One joule means that

A. Work is done by a force of 1 N when it displaces a body through 1 m

B. Work is done by a force of 1 kg when it displaces a body through 1 m

C. Work is done by a force of 1 dyne when it displaces a body through 1 cm

D. Work is done by a force of 1 g when it displaces a body through 1 cm

Answer: Option A

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38. One kg force is equal to

A. 7.8 N

B. 8.9 N

C. 9.8 N

D. 12 N

Answer: Option C

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39. If a body is acted upon by a number of coplanar non-concurrent forces, it may

A. Rotate about itself without moving

B. Move in any one direction rotating about itself

C. Be completely at rest

D. All of these

Answer: Option D

40. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as:

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

Answer: Option B

Engineering Mechanics MCQ with Answers Pdf Free Download

41. When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

A. Simple pendulum

B. Compound pendulum

C. Torsional pendulum

D. Second's pendulum

Answer: Option B

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42. When a body falls freely under gravitational force, it possesses

__________ weight.

A. No

B. Minimum

C. Maximum

D. None of these

Answer: Option A

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44. The total energy possessed by a system of moving bodies

A. Is constant at every instant

B. Varies from point to point

C. Is maximum in the start and minimum at the end

D. Is minimum in the start and maximum at the end

Answer: Option A

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45. The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

A. Coplanar concurrent forces

B. Coplanar non-concurrent forces

C. Non-coplanar concurrent forces

D. None of these

Answer: Option D

Engineering Mechanics MCQ with Answers Pdf Free Download

46. Which of the following is not the unit of work, energy and heat?

A. kcal

B. kg-m

C. kW-hr

D. h.p

Answer: Option D

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47. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

A. Friction

B. Limiting friction

C. Repose

D. Kinematic friction

Answer: Option C

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48. The algebraic sum of moments of the forces forming couple about any point in their plane is

A. Equal to the moment of the couple

B. Constant

C. Both of above are correct

D. Both of above are wrong

Answer: Option A

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49. The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s^2 , is

A. 20 N

B. 100 N

C. 500 N

D. None of these

Answer: Option C

50. The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

A. Directly

B. Inversely

C. Square root

D. None of these

Answer: Option B

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56. The velocity ratio of a single purchase crab winch can be increased by

A. Increasing the length of the handle

B. Increasing the radius of the load drum

C. Increasing the number of teeth of the pinion

D. All of the above

Answer: Option A

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57. Concurrent forces are those forces whose lines of action

A. Lie on the same line

B. Meet at one point

C. Meet on the same plane

D. None of these

Answer: Option B

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58. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

A. Density of metal can't be determined

B. Metal is twice as dense as water

C. Metal will float in water

D. Metal is twice as dense as unknown fluid

Answer: Option A

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