Objective Type Questions with Answer Engineering Mechanics - Set 06 - ObjectiveBooks
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# Practice Test: Question Set - 06

1. The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)
(A) h/2
(B) h/3
(C) h/4
(D) h/6

2. A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of
(A) r/2
(B) r/A
(C) r/3
(D) 0.134 r

3. Which of the following statement is incorrect?
(A) A force acting in the opposite direction to the motion of the body is called force of friction
(B) The ratio of the limiting friction to the normal reaction is called coefficient of friction
(C) A machine whose efficiency is 100% is known as an ideal machine
(D) The velocity ratio of a machine is the ratio of load lifted to the effort applied

4. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
(A) Density of metal can't be determined
(B) Metal is twice as dense as water
(C) Metal will float in water
(D) Metal is twice as dense as unknown fluid

5. The centre of percussion is below the centre of gravity of the body and is at a distance equal to
(A) h/kG
(B) h2/kG
(C) kG2/h
(D) h × kG

6. A cable with a uniformly distributed load per horizontal meter run will take the following shape
(A) Straight line
(B) Parabola
(C) Hyperbola
(D) Elliptical

7. When a body falls freely under gravitational force, it possesses __________ weight.
(A) No
(B) Minimum
(C) Maximum
(D) None of these

8. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
(A) 38 m
(B) 62.5 m
(C) 96 m
(D) 124 m

9. When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.
(A) Directly proportional
(B) Inversely proportional
(C) Cube root
(D) None of these

10. Limiting force of friction is the
(A) Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
(B) Ratio of limiting friction and normal reaction
(C) The friction force acting when the body is just about to move
(D) The friction force acting when the body is in motion

11. A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)
(A) MS/3
(B) MS/4
(C) MS/5
(D) None of these

12. The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be
(A) 20 kg, -ve sense
(B) 20 kg, + ve sense
(C) 10 kg, + ve sense
(D) 10 kg, -ve sense

13. In a framed structure, as shown in the below figure, the force in the member BC is
(A) W/3 (compression)
(B) W/3 (tension)
(C) 2W/3 (compression)
(D) 2W/3 (tension)

14. For any system of coplanar forces, the condition of equilibrium is that the
(A) Algebraic sum of the horizontal components of all the forces should be zero
(B) Algebraic sum of the vertical components of all the forces should be zero
(C) Algebraic sum of moments of all the forces about any point should be zero
(D) All of the above

15. D' Alembert's principle is used for
(A) Reducing the problem of kinetics to equivalent statics problem
(B) Determining stresses in the truss
(C) Stability of floating bodies
(D) Designing safe structures

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