Engineering Mechanics MCQ Exam - Set 11

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Q1. A force is completely defined when we specify

(A) Magnitude
(B) Direction
(C) Point of application
(D) All of the above

Answer: (D) All of the above

Q2. The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

(A) 9 cm4
(B) 12 cm4
(C) 16 cm4
(D) 20 cm4

Answer: (C) 16 cm4

Q3. The power developed by a body acted upon by a torque ‘T’ Newton meter (N – m) and revolving at ω radian/s is given by

(A) T.ω (in watts)
(B) T.ω/60 (in watts)
(C) T.ω/75 (in kilowatts)
(D) T.ω/4500 (in kilowatts)

Answer: (A) T.ω (in watts)

Q4. In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will

(A) Increase
(B) Decrease
(C) Remain the same
(D) None of these

Answer: (B) Decrease

Q5. 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: (A) Increasing the length of the handle

Q6. The friction experienced by a body, when in motion, is known as

(A) Rolling friction
(B) Dynamic friction
(C) Limiting friction
(D) Static friction

Answer: (B) Dynamic friction

Q7. 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: (B) Meet at one point

Q8. The point, through which the whole weight of the body acts, irrespective of its position, is known as

(A) Moment of inertia
(B) Center of gravity
(C) Center of percussion
(D) Center of mass

Answer: (B) Center of gravity

Q9. 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: (D) 120°

Q10. The horizontal range of a projectile (R) is given by

(A) R = u² cos2α/g
(B) R = u² sin2α/g
(C) R = u² cosα/g
(D) R = u² sinα/g

Answer: (B) R = u² sin2α/g

Q11. 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: (D) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

Q12. 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: (B) Newton’s second law of motion

Q13. A framed structure is perfect if it contains members equal to
(Where, n = number of joints in a frame)

(A) 2n³
(B) 2n
(C) n²
(D) 3n²

Answer: (A) 2n³

Q14. 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

Answer: (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

Q15. 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%

Answer:(D) 100%

Q16. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘v’ is made to strike the second ball. Both the balls after impact will move with a velocity

(A) v
(B) v/2
(C) v/4
(D) v/8

Answer: (B) v/2

Q17. Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

(A) (2/3) Ml²
(B) (1/3) Ml²
(C) (3/4) Ml²
(D) (1/12) Ml²

Answer: (D) (1/12) Ml²

Q18. The moment of inertia of a solid cylinder of mass ‘m’, radius ‘r’ and length ‘l’ about the longitudinal axis or polar axis is

(A) mr2/2
(B) mr2/4
(C) mr2/6
(D) mr2/8

Answer: (A) mr2/2

Q19. 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: (A) Is constant at every instant

Q20. In actual machines, mechanical advantage is _ velocity ratio.

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

Answer: (B) Less than

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Engineering Mechanics MCQ Exam – Set 11 :: Mechanical Engineering