Multiple Choice Questions Civil Applied Mechanics – Set 13

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Q1. Instantaneous center is at infinity when the angular velocity is

(A) Constant
(B) Zero
(C) Maximum
(D) Minimum

Answer: (B) Zero

Q2. A body is said to move with Simple Harmonic Motion if its acceleration, is

(A) Always directed away from the centre, the point of reference
(B) Proportional to the square of the distance from the point of reference
(C) Proportional to the distance from the point of reference and directed towards it
(D) Inversely proportion to the distance from the point of reference

Answer: (C) Proportional to the distance from the point of reference and directed towards it

Q3. If the velocity of projection is 4 m/sec and the angle of projection is α°, the maximum height of the projectile from a horizontal plane, is

(A) u² cos² α/2g
(B) u² sin² α/2g
(C) u² tan² α/2g
(D) u² sin 2α/2g

Answer: (B) u² sin² α/2g

Q4. When a body moves round a fixed axis, it has

(A) A rotary motion
(B) A circular motion
(C) A translatory
(D) A rotary motion and translatory motion

Answer: (B) A circular motion

Q5. When a body moves round a fixed axis, it has

(A) A rotary motion
(B) A circular motion
(C) A translatory
(D) A rotary motion and translatory motion

Answer: (B) A circular motion

Q6. If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along

(A) The same line in the same sense
(B) The same line in opposite sense
(C) The perpendicular to both the lines
(D) None of these

Answer: (B) The same line in opposite sense

Q7. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

(A) 50 %
(B) 40 %
(C) 55 %
(D) 30 %

Answer: (A) 50 %

Q8. The load shared by the member BC of the structure shown in below figure is

(A) 23 t
(B) 32 t
(C) 4 t
(D) 3 t

Answer: (C) 4 t

Q9. The shape of a suspended cable for a uniformly distributed load over it is

(A) Circular
(B) Parabolic
(C) Catenary
(D) Cubic parabola

Answer: (B) Parabolic

Q10. Newton’s Law of Motion is:

(A) Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
(B) The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
(C) To every action, there is always an equal and opposite reaction
(D) All the above

Answer: (D) All the above

Q11. A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be

(A) 0.01 m/sec
(B) 0.05 m/sec
(C) 1.00 m/sec
(D) 1.5 m/see

Answer: (B) 0.05 m/sec

Q12. Kinetic friction may be defined as

(A) Friction force acting when the body is just about to move
(B) Friction force acting when the body is in motion
(C) Angle between normal reaction and resultant of normal reaction and limiting friction
(D) Ratio of limiting friction and normal reaction

Answer: (B) Friction force acting when the body is in motion

Q13. Time period and length of a second’s pendulum respectively are

(A) 1 sec and 99.4 cm
(B) 1 sec and 92.7 cm
(C) 2 sec and 99.4 cm
(D) 2 sec and 92.7 cm

Answer: (C) 2 sec and 99.4 cm

Q14. Time period and length of a second’s pendulum respectively are

(A) 1 sec and 99.4 cm
(B) 1 sec and 92.7 cm
(C) 2 sec and 99.4 cm
(D) 2 sec and 92.7 cm

Answer: (C) 2 sec and 99.4 cm

Q15. Ball ‘A’ of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball ‘B’ on the table. If the impact is perfectly elastic, the velocity of the ball ‘B’ just after impact would be

(A) Zero
(B) 5 m/sec
(C) 10 m/sec
(D) None of these

Answer: (C) 10 m/sec

Applied Mechanics and Graphic Statics MCQ with Answers

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