Engineering Mechanics MCQ Practice Test - ObjectiveBooks

# Practice Test: Question Set - 22

1. The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called
(A) Newton's first law of motion
(B) Newton's second law of motion
(C) Principle of conservation of energy
(D) Principle of conservation of momentum

2. 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

3. 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

4. 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°

5. In actual machines, mechanical advantage is _________ velocity ratio.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

6. The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is
(A) 2mr2/3
(B) 2mr2/5
(C) mr2
(D) mr2/2

7. Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is
(A) db³/12
(B) bd³/12
(C) db³/36
(D) bd³/36

8. The unit of power in S.I. units is
(A) Horsepower
(B) Joule
(C) Watt
(D) kg-m

9. The maximum height of a projectile on a horizontal plane, is
(A) u² sin²α/2g
(B) u² cos²α/2g
(C) u² sin²α/g
(D) u² cos²α/g

10. One watt is equal to
(A) 0.1 joule/s
(B) 1 joule/s
(C) 10 joules/s
(D) 100 joules/s

11. The moment of inertia of a square of side a about its diagonal is
(A) a2/8
(B) a3/12
(C) a4/12
(D) a4/16

12. The maximum acceleration of a particle moving with simple harmonic motion is
(A) ω
(B) ωr
(C) ω2r
(D) ω/r

13. The rate of change of displacement of a body is called
(A) Velocity
(B) Acceleration
(C) Momentum
(D) None of these

14. The maximum mechanical advantage of a lifting machine is
(A) 1 + m
(B) 1 - m
(C) 1 / m
(D) m

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