Multiple Choice Questions Civil Applied Mechanics - Set 13 - ObjectiveBooks

# Practice Test: Question Set - 13

1. Instantaneous center is at infinity when the angular velocity is
(A) Constant
(B) Zero
(C) Maximum
(D) Minimum

2. 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

3. 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 %

4. 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

5. 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

6. The frequency of oscillation on moon as compared to that on earth, will be
(A) 2.44 times more
(B) 2.44 times less
(C) 3 times less
(D) 3 times more

7. The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is
(A) 188.5 m/sec
(B) 18.85 m/sec
(C) 1.885 m/sec
(D) 0.18845 m/sec

8. The centre of gravity of the trapezium as shown in below figure from the side is at a distance of
(A) (h/3) × [(b + 2a)/(b + a)]
(B) (h/3) × [(2b + a)/(b + a)]
(C) (h/2) × [(b + 2a)/(b + a)]
(D) (h/2) × [(2b + a)/(b + a)]

9. Cartesian form of the equation of catenary is
(A) y = c cosh x/c
(B) y = c sinh x/c
(C) y = c tan x/c
(D) y = c sin x/c

10. The moment of inertia of a triangular section (base b, height h) about centroidal axis parallel to the base, is
(A) b3h/12
(B) bh3/3
(C) bh3/36
(D) bh3/2

11. To attain the synchronous orbit, the launch of a satellite, is done from a place
(A) On equator
(B) On 30° latitude
(C) On 45° latitude
(D) On the poles

12. Pick up the correct statement from the following. A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall, falls down
(A) Rubber and lead balls undergo equal changes in momentum
(B) Change in momentum suffered by lead ball is less that of rubber ball
(C) Momentum of rubber ball is less than that of lead ball
(D) None of these

13. Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction.
The speeds of the objects are:
(A) 2 m/sec and 2 m/sec
(B) 3 m/sec and 2 m/sec
(C) 3 m/sec and 3 m/sec
(D) 4 m/sec and 6 m/sec

14. A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was
(A) 0.5 m/sec2
(B) 0.7 m/sec2
(C) 1 m/sec2
(D) 1 cm/sec2

15. The product of mass and velocity of a moving a body, is called
(A) Moment
(B) Momentum
(C) Power
(D) Impulse

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