Engineering Mechanics MCQ Quiz - Set 10

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Q1. Which of the following is not the unit of energy?

(A) kg m
(B) kcal
(C) Watt
(D) Watt hours

Answer: (C) Watt

Q2. Dynamic friction as compared to static friction is

(A) Same
(B) More
(C) Less
(D) May be less of more depending on nature of surfaces and velocity

Answer: (C) Less

Q3. The coefficient of friction depends on

(A) Area of contact
(B) Shape of surfaces
(C) Strength of surfaces
(D) Nature of surface

Answer: (D) Nature of surface

Q4. 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: (B) 10

Q5. Moment of inertia of a hollow circular section, as shown in the below figure about X-axis, is

(A) π/16 (D² – d²)
(B) π/16 (D³ – d³)
(C) π/32 (D⁴ – d⁴)
(D) π/64 (D⁴ – d⁴)

Answer: (D) π/64 (D⁴ – d⁴)

Q6. Work done is said to be zero, when

(A) Some force acts on a body, but displacement is zero
(B) No force acts on a body but some displacement takes place
(C) Either (A) or (B)
(D) None of the above

Answer: (C) Either (A) or (B)

Q7. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

(A) mr2/3
(B) 2mr2/3
(C) 2mr2/5
(D) 3mr2/5

Answer: (B) 2mr2/3

Q8. If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton’s second law of motion,

(A) P + m.a = 0
(B) P – m.a = 0
(C) P × m.a = 0
(D) P/m.a = 0

Answer: (B) P – m.a = 0

Q9. 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: (A) 15 N and 5 N

Q10. During elastic impact, the relative velocity of the two bodies after impact is __ the relative velocity of the two bodies before impact.

(A) Equal to
(B) Equal and opposite to
(C) Less than
(D) Greater than

Answer: (B) Equal and opposite to

Q11. In order to completely specify angular displacement by a vector, it must fix

(A) Direction of the axis of rotation
(B) Magnitude of angular displacement
(C) Sense of angular displacement
(D) All of these

Answer: (D) All of these

Q12. The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

(A) β/2
(B) 30° + β/2
(C) 45° + β/2
(D) 60° + β/2

Answer: (C) 45° + β/2

Q13. 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

Answer:(D) Four times

Q14. In a framed structure, as shown in the below figure, the force in the member AB is __ the force in member AC.

(A) Half
(B) Equal to
(C) Double
(D) None of these

Answer: (A) Half

Q15. A body will begin to move down an inclined plane if the angle of inclination of the plane is _ the angle of friction.

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

Answer: (C) Greater than

Q16. 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: (D) None of these

Q17. The range of projectile on a downward inclined plane is __ the range on upward inclined plane for the same velocity of projection and angle of projection.

(A) Less than
(B) More than
(C) Equal to
(D) None of These

Answer: (B) More than

Q18. The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

(A) 3mr2/5
(B) 3mr2/10
(C) 2mr2/5
(D) 4mr2/5

Answer: (B) 3mr2/10

Q19. If three forces acting in different planes can be represented by a triangle, these will be in

(A) Non-equilibrium
(B) Partial equilibrium
(C) Full equilibrium
(D) Unpredictable

Answer:(A) Non-equilibrium

Q20. Which of the following are vector quantities?

(A) Linear displacement
(B) Linear velocity
(C) Linear acceleration
(D) All of these