Engineering Mechanics Test Questions - Set 17 - ObjectiveBooks
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# Practice Test: Question Set - 17

1. The velocity ratio for the third system of pulleys is
(A) n
(B)
(C) 2n
(D) 2n - 1

2. 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

3. 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

4. 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

5. 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%

6. If a number of forces are acting at a point, their resultant is given by
(A) (∑V)2 + (∑H)2
(B) √[(∑V)2 + (∑H)2]
(C) (∑V)2 +(∑H)2 +2(∑V)(∑H)
(D) √[(∑V)2 +(∑H)2 +2(∑V)(∑H)]

7. The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is
(A) 20 N
(B) 100 N
(C) 500 N
(D) None of these

8. Which of the following is not the unit of pressure?
(A) kg/cm
(B) Bar
(C) Atmosphere
(D) Newton

9. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
(A) Static friction
(B) Dynamic friction
(C) Limiting friction
(D) Coefficient of friction

10. The principle of transmissibility of forces states that, when a force acts upon a body, its effect is
(A) Same at every point on its line of action
(B) Different at different points on its line of action
(C) Minimum, if it acts at the center of gravity of the body
(D) Maximum, if it acts at the center of gravity of the body

11. In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
(A) P = W tan (α - φ)
(B) P = W tan (α + φ)
(C) P = W tan (φ - α)
(D) P = W cos (α + φ)

12. The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is
(A) mr2/2
(B) mr2/4
(C) mr2/6
(D) mr2/8

13. 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

14. The matter contained in a body, is called
(A) Impulsive force
(B) Mass
(C) Weight
(D) Momentum

15. Moment of inertia is the
(A) Second moment of force
(B) Second moment of area
(C) Second moment of mass
(D) All of these

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