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Quiz 4
Mdcat-past-papers - NUMS - Physics Quiz
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Board: NUMS | Subject: Physics |
61. Relation between K.E and momentum P:
K.E = ½ P/M
K.E = ½ P²/M
K.E = ½ P²/M²
K.E = ½ P²
62. Dolphin leaves water with kinetic energy. At top it has:
Kinetic energy
Potential energy
Elastic potential energy
Neither
63. A ball with momentum 8Kg•m/s rebounds straight back without K.E loss. Change in momentum:
4Ns
-16Ns
16Ns
8Ns
64. Ball of mass 'm' dropped from height 'h' penetrates 'd' in sand. Average resistive force is:
mg(d/h)
mg(h/d)
mg(1 + h/d)
mg(1 - h/d)
65. If body mass 'm' and velocity 'v', then velocity becomes double. K.E becomes:
2 times increased
2 times decreased
4 times increased
4 times decreased
66. The dimension of angular velocity is:
MLT
MLT⁻¹
MLT²
M⁰LT⁻¹
67. One complete circle is equal to:
2π radian
3 radian
5 radian
6 radian
68. An object moving along circular path of radius 1m. It covers a distance of 2m along circumference of circle. The angular distance is:
1 rad
2 rad
3 rad
2/3 rad
69. The relation between angular and linear velocity is:
v = r/w
v = rw
w = v/r
w = v/r
70. One degree is equal to:
0.15 rad
0.0175 rad
0.025 rad
0.0275 rad
71. A rotating wheel coincides 12 rev in 4s. Find the average angular velocity in rad/sec.
24.6 rad/s
16.8 rad/s
10.4 rad/s
18.8 rad/s
72. An electric motor turns at 400 revolutions per minute. Its angular velocity in rad/s will be:
20 π /3
40 π /3
30 π /3
30 π /4
73. The velocity of an object moving in a circle is:
Constant
Variable
Zero
Negative
74. Sara goes around a circular track that has diameter of 20m. If she runs around the entire track for a distance of 180m. What is her angular displacement?
18 radians
18 radians
50 radians
8 radians
75. Angle swept by minute hand in one minute is:
6°
3°
8°
20°
76. To find the direction of angular displacement:
Grasp the axis of rotation in right hand
Grasp the axis of rotation in left hand
Put the thumb of right hand in the direction of circular motion
Put the thumb of left hand in the direction of circular motion
77. A particle moves in a circle of radius 200cm with a linear speed of 20m/s. Find the angular velocity:
2 rad s⁻¹
200 rad s⁻¹
20 rad s⁻¹
10 rad s⁻¹
78. For anti-clock wise rotation the angular displacement is:
Negative
Positive
Null
Zero
79. How many degrees in 2π/5 radians?
50°
60°
72°
120°
80. In motion of satellites, necessary centripetal force is provided by:
Gravitational force
Coulomb's force
Magnetic force
Nuclear force
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