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Physics Class 11 - Chapter 5BRCircular MotionBRTest - 4
1.
A satellite moving round the earth constitutes?
a) An inertial frame of reference
b) Non inertial frame of reference
c) Both inertial and non inertial
d) Neither inertial nor non inertial
2.
When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by?
a) Velocity of the body
b) Centrifugal force
c) Tension of the body
d) Mass of the body
3.
Discovery of inverse square law is by?
a) Newton’s
b) Planks
c) Galileo
d) Einstein
4.
A man of weight W is standing on an elevator which is ascending with an acceleration a. the apparent weight of the man is?
a) mg - ma
b) mg + ma
c) mg
d) None of these
5.
The planet nearest to earth is
a) Uranus
b) Sun
c) Mercury
d) Venus
6.
Angular speed of secondâ€™s hand of a watch on rad
^{-1}
is?
a) pi
b) pi/180
c) pi/2
d) pi/30
7.
The shaft of motor rotates at a constant angular speed of 360rev/min. angle turned through in 1 sec in radian is?
a) 6pi
b) 12pi
c) 3pi
d) pi
8.
If acer moves with a uniform sped of 2ms-1 in a circle of radius 0.4.its angular speed is?
a) 7 rads
^{-1}
b) 1.5 rads
^{-1}
c) 4 rads
^{1}
d) 5 rads
^{-1}
9.
The circumference subtends an angle?
a) Pi radian
b) Pi/4 radian
c) 2 pi radian
d) 4pi radian
10.
When a body moves in a circle, the angle between its linear velocity and angular velocity is always?
a) 0
^{o}
b) 180
^{o}
c) 90
^{o}
d) 45
^{o}
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