1. To replace a ball with another ball by collision, a snooker player must consider the condition that
Correct : C. both A and B
2. Direction of momentum is direction of object's
Correct : C. velocity
3. In a springy collision, if the fast moving trolley collides with a slow one, then the fast one will bounce back at speed of
Correct : A. slow one
4. An object travelling with constant velocity has
Correct : A. constant momentum
5. If a trolley collides with a stationary trolley of double mass, then they move off with
Correct : B. one third of original velocity
6. In a perfectly elastic collision, momentum and energy are
Correct : B. conserved
7. Mass and velocity are combined to give
Correct : D. linear momentum
8. If the total kinetic energy and momentum of a system becomes zero after collision, then the collision is
Correct : B. inelastic
9. Momentum of two objects moving with same speed but in opposite direction upon collision is
Correct : C. is zero
10. Forces on interacting bodies are
Correct : C. both A and B
11. Resultant force acting on object and rate of change of linear momentum are
Correct : C. directly related
12. In a perfectly elastic collision, the relative speed of approach and relative speed of separation are
Correct : A. equal
13. {{}} A white ball of mass 1.0 kg moving with initial speed u = 0.5 m s -1 collides with stationary red ball of same mass, they move forward making angle of 90° between their paths. Their speed is
Correct : B. 0.354 m s -1
14. In fireworks the momentum provided by chemicals is directed
Correct : D. downwards
15. Total momentum within a closed system is
Correct : D. constant
16. Average force acting on 900 kg car if it's velocity ranges from 5 m s -1 to 30 m s -1 in 12 s is {{}}
Correct : A. 1875 N
17. Interaction that causes an object's momentum to change is
Correct : D. force
18. Momentum possessed by spinning objects is called
Correct : B. angular momentum
19. In a perfectly inelastic collision, kinetic energy
Correct : A. totally disappears
20. Contact force always acts at
Correct : B. right angles to the surface producing it
21. Combinations of base units are
Correct : B. derived units
22. Two forces which make up Newton's third law can
Correct : B. act on different objects
23. Rate of falling object in vacuum is
Correct : C. independent of mass
24. At terminal velocity the
Correct : A. air resistance and weight are equal
25. Vehicle will accelerate as long as
Correct : C. thrust is greater than air resistance and friction
26. 1 N is equal to {{}}
Correct : A. 1 kg m s-2
27. Density of air is
Correct : D. 1⁄800 of water
28. Until a force acts on a body, it's velocity is
Correct : B. constant
29. If there is no net force acting on body, then its acceleration is
Correct : A. zero
30. Acceleration of a rocket having mass 5000 kg and resultant force acting on it is 200,000 N is {{}}
Correct : D. 40 m s-2
31. Force which makes it difficult to run through shallow water is called
Correct : D. drag
32. Prefix for 10-9is {{}}
Correct : D. nano
33. Acceleration due to gravity on moon is
Correct : D. 1.6 m s-2
34. An object immersed in fluid experiences an upward force named
Correct : C. up thrust
35. If each term in an equation has same base units then the equation is said to be
Correct : A. homogeneous
36. A force similar to friction is
Correct : C. drag force
37. Forces acting on an object are balanced if resultant force on object is
Correct : B. zero
38. Base unit among following is
Correct : C. Candela
39. Force provided by breaking system of train if it is decelerating at rate of -3 m s -2 and having mass 10,000 kg is {{}}
Correct : A. -30,000 N
40. Force applied on a body and its acceleration are
Correct : B. directly related
41. The larger the mass of a moving object the
Correct : C. smaller the acceleration
42. 500 MW can be written in powers of 10 as {{}}
Correct : A. 500 × 106
43. Point where entire weight of an object acts is
Correct : B. center of gravity
44. Another name for force of gravity acting on an object is
Correct : C. weight
45. When two objects are in contact, they exert forces in
Correct : A. opposite direction
46. Activity is proportional to number of
Correct : C. undecayed nuclei
47. Energy given to nucleus to dismantle it increases the
Correct : C. potential energy of individual nucleons
48. Radioactive decay is a
Correct : A. random process
49. 1 u is equal to {{}}
Correct : A. 1.660 × 10-27 kg
50. In gamma emission, the change in nucleon number is
Correct : A. zero
51. At higher energy, the bodies have
Correct : B. large mass
52. Time taken by a radioactive substance to decay half is called
Correct : B. half life
53. Most stable isotope in nature is of
Correct : A. iron-56
54. Activity of one decay per second is equal to
Correct : A. 1 Bq
55. The greater the decay constant
Correct : B. the greater the activity
56. Total amount of mass and energy together in a system is
Correct : D. constant
57. Process by which energy is released in sun is
Correct : C. fusion
58. Minimum energy required to pull nucleus apart is called
Correct : D. binding energy
59. Mass excess for U-235 is
Correct : B. 0.043 u
60. As compared to proton, mass of neutron is
Correct : D. 0.1% greater
61. 1 mole of uranium-238 has potential to emit total energy equal to about
Correct : C. 1011 J
62. If energy is released from a system, it's mass
Correct : A. decreases
63. New nucleus after alpha particle decays, is called
Correct : B. daughter nucleus
64. If nucleus is formed from separate nucleons, then energy is
Correct : B. released
65. Maximum displacement from equilibrium position is
Correct : B. amplitude
66. Displacement-time graph depicting an oscillatory motion is
Correct : B. sine curve
67. In s.h.m, velocity at equilibrium position is
Correct : C. maximum
68. Natural frequency of a guitar string can be changed by changing it's
Correct : C. length
69. Over-damping results in
Correct : A. slower return to equilibrium
70. Our eyes detect the oscillations up to
Correct : D. 5 Hz
71. For s.h.m, maximum speed is proportional to
Correct : D. frequency
72. A force that acts to return the mass to it's equilibrium position is called
Correct : B. restoring force
73. In cars, springs are damped by
Correct : A. shock absorbers
74. If time period of an oscillation is 0.40 s, then it's frequency is
Correct : B. 2.5 Hz
75. As amplitude of resonant vibrations decreases, degree of damping
Correct : C. decreases
76. Oscillations become damped due to
Correct : B. friction
77. In s.h.m, object's acceleration depends upon
Correct : C. both A and B
78. angular frequency of s.h.m is equal to
Correct : B. 2πf
79. For a resonating system it should oscillate
Correct : C. freely
80. Velocity at equilibrium position is
Correct : C. maximum
81. If the swing moves from right to left, then velocity is
Correct : A. negative
82. Acceleration is directly related to
Correct : B. negative of displacement
83. Gradient of velocity-time graph gives
Correct : D. acceleration
84. Magnitude of gradient of a-x graph is {{}}
Correct : B. ω2
85. Potential energy of system is maximum at
Correct : A. extreme position
86. In s.h.m, acceleration is always directed towards the
Correct : A. equilibrium position
87. Number of oscillations per unit time is
Correct : C. frequency
88. When displacement x = 0, then kinetic energy of system is
Correct : B. maximum
89. Energy of a system executing s.h.m is
Correct : C. constant
90. Oscillatory motion has a
Correct : C. sinusoidal graph
91. During one oscillation, phase of oscillation changes by
Correct : C. 2π rad
92. If an object moves back and forth repeatedly around a mean position
it is called
Correct : A. oscillating
93. Terminal potential difference of battery depends on
Correct : D. resistance of external resistor
94. Systematic errors occur due to
Correct : C. both A and B
95. In cells, internal resistance is due to
Correct : B. chemicals within
96. Measurement which is close to the true value is
Correct : A. accurate
97. A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s-1, the frequency of note heard by observer is {{}}
Correct : A. 978 Hz
98. Smallest division on a rule is of
Correct : C. 1 mm
99. If the two quantizes are inversely proportional then graph between y and 1/x gives