All Solved MCQs of Chapter 4 Rotational & Circular Motion
1. One radian is about
a) 25° c) 450 b) 37° d) 57°
2. Wheel turns with constant angular speed
then:
a) each point on its rim moves with Constant
velocity b) each point on its rim moves
with constant acceleration c) the wheel
turns through equal angles in equal times
d) the angle through which the wheel turns in
each second increases as time goes on e)
the angle through which the wheel turns in each second decreases as time goes
on
3. The rotational inertia of a wheel about its
axle does not depend upon its
a) diameter c) distribution of mass
b) mass d) speed of rotation
4. A force with at given magnitude is to be
applied to a wheel. The torque can be
maximized by
a) applying the force near the axle, radially
outward from the axle.
b) applying the force near the rim, radially outward.
c) applying the force near the axle, parallel
to a tangent to the wheel.
d) applying the force at the rim, tangent to
the rim
5. An object rotating about a fixed axis, I is its
rotational inertia and a is its angular
acceleration. Its
a) is the definition of torque
b) is the definition of rotational inertia
c) is definition of angular acceleration
d) follows directly from Newton’s second law.
6. The angular momentum vector of Earth about
its rotation axis, due to its daily rotation
is, directed
a) tangent to the equator towards east c) north
b) tangent to the ua1or towards the west
d) towards the Sun
7. A stone of 2 kg is tied to a 0.50 rn long
string and swung around a circle at angular velocity of 12 rad/s . The net
torque on the stone about the center of the circle is
a) 0 N.m c) 12 N.m b) 6N.m d) 72N.m
8. A man, with his arms at his sides, is
spinning on a light frictionless turntable. When he
extends his arms
a) his angular velocity increases b) his angular velocity remains same c) his rotational inertia decreases d) his angular momentum remains the same.
9. A
space station revolves around the earth as a satellite. 100 km above the
Earth’s surface.
What is the net force on an astronaut at
rest inside the space station?
a) Equal to her weight on earth
b) a little less than her weight on earth
c)
Less than half her weight on earth
d) Zero (she is weightless)
10.
If the external torque acting on a body is zero, then its
a)
Angular momentum is zero
b)
Angular momentum is conserved
C) Angular acceleration is
maximum
d
rotational motion is maximum
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