Multiple Choice Questions Test Engineering Mechanics - Set 19 - ObjectiveBooks
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# Practice Test: Question Set - 19

1. One joule is equal to
(A) 0.1 N-m
(B) 1 N-m
(C) 10 N-m
(D) 100 N-m

2. 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

3. 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

4. The friction experienced by a body, when in motion, is known as
(A) Rolling friction
(B) Dynamic friction
(C) Limiting friction
(D) Static friction

5. 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

6. If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.
(A) Change
(B) Does not change
(C) Changes periodically
(D) None of these

7. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring.)
(A) 2π. √(g/δ)
(B) 1/2π. √(g/δ)
(C) 2π. √(δ/g)
(D) 1/2π. √(δ/g)

8. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
(A) g/2
(B) g/3
(C) g/4
(D) None of these

9. The friction experienced by a body, when at rest, is known as
(A) Static friction
(B) Dynamic friction
(C) Limiting friction
(D) Coefficient of friction

10. The unit of force in S.I. system of units is
(A) Dyne
(B) Kilogram
(C) Newton
(D) Watt

11. One kg force is equal to
(A) 7.8 N
(B) 8.9 N
(C) 9.8 N
(D) 12 N

12. The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then
(A) P = Q
(B) Q = R
(C) Q = 2R
(D) None of these

13. The amplitude is always __________ radius of the circle.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

14. The moment of the force ‘P’ about ‘O’ as shown in the below figure is

(A) P × OA
(B) P × OB
(C) P × OC
(D) P × AC

15. The process of finding out the resultant force is called __________ of forces.
(A) Composition
(B) Resolution
(C) Decomposition
(D) None of these

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