Online Study Materials on Graphic Statics - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball ‘B’ on the table. If the impact is perfectly plastic, 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

2. The length of a Second's pendulum, is
(A) 99.0 cm
(B) 99.4 cm
(C) 100 cm
(D) 101 cm

3. The following statement is one of the laws of Dynamic friction
(A) The force of friction always acts in a direction opposite to that in which a body is moving
(B) The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
(C) For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
(D) All the above

4. Force polygon method is applicable for
(A) Any coplanar force system
(B) A system of parallel forces only
(C) Concurrent coplanar force system
(D) Non-concurrent coplanar force system

5. A weight of 100 kg is supported by a string whose ends are attached to pegs ‘A’ and ‘B’ at the same level shown in below figure. The tension in the string is
(A) 50 kg
(B) 750 kg
(C) 100 kg
(D) 120 kg

6. A particle moves along a straight line such that distance ‘x’ traversed in ‘t’ seconds is given by x = t2(t + 1), the acceleration of the particle, will be
(A) 3t3 - 2t
(B) 3t2 + 2t
(C) 6t - 2
(D) 6t + 2

7. If two forces P and Q (P > Q) act on the same straight line but in opposite direction, their resultant, is
(A) P + Q
(B) P/Q
(C) Q/P
(D) P - Q

8. The condition of equilibrium for any system of forces in a plane is
(A) That polygon of forces must close
(B) That resultant couple must be zero
(C) Both (A) and (B)
(D) None of the above

9. Varingon’s theorem of moment’s states
(A) Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point
(B) Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
(C) Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
(D) Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point

10. If g1 and g2 are the gravitational accelerations on two mountains A and B respectively, the weight of a body when transported from A to B will be multiplied by
(A) g1
(B) g2
(C) g1/g2
(D) g2/g1

11. The characteristic of a couple is:
(A) Algebraic sum of forces, constituting a couple is zero
(B) Algebraic sum of moments of forces, constituting a couple, about any point, is same
(C) A couple can be never the balanced by a single force
(D) All the above

12. When two forces, each equal to P, act at 90° to each other, then the resultant will be
(A) P
(B) P√2
(C) P/√2
(D) 2P

13. The displacement of a particle which moves along a straight line is given by S = 4t3 + 3t2- 10 where ‘S’ is in meters and t is in seconds. The time taken by the particle to acquire a velocity of 18 m/sec from rest, is
(A) ½ sec
(B) 1 sec
(C) 1.2 sec
(D) 1.5 sec

14. Which one of the following statements is true?
(A) The tangent of the angle of friction is equal to coefficient of friction
(B) The angle of repose is equal to angle of friction
(C) The tangent of the angle of repose is equal to coefficient of friction
(D) All the above

15. 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 velocity ratio of the lifting machine is
(A) 50
(B) 55
(C) 60
(D) 65

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