MCQ objective Questions on Engineering Mechanics - Set 20 - ObjectiveBooks

# Practice Test: Question Set - 20

1. Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)
(A) v = u + a.t
(B) s = u.t + ½ a.t2
(C) v2 = u2 + 2a.s
(D) All of these

2. 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)

3. 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

4. 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

5. 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

6. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)
(A) IP = IG + Ah2
(B) IP = IG - Ah2
(C) IP = IG / Ah2
(D) IP = Ah2 / IG

7. The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)
(A) P = mW - C
(B) P = m/W + C
(C) P = mW + C
(D) P = C - mW

8. 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

9. The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by
(A) 2P sinθ/2
(B) 2P cosθ/2
(C) 2P tanθ/2
(D) 2P cotθ/2

10. The coefficient of restitution for inelastic bodies is
(A) Zero
(B) One
(C) Between zero and one
(D) More than one

11. If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that
(A) tanθ = ΣH/ΣV
(B) tanθ = ΣV/ΣH
(C) tanθ = ΣV × ΣH
(D) tanθ = √(ΣV + ΣH)

12. 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

13. The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)
(A) α = 45° + φ/2
(B) α = 45° - φ/2
(C) α = 90° + φ
(D) α = 90° -  φ

14. The total motion possessed by a body, is called
(A) Impulsive force
(B) Mass
(C) Weight
(D) Momentum

15. A screw jack used for lifting the loads is
(A) A reversible machine
(B) A non-reversible machine
(C) An ideal machine
(D) None of these

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