Physics
MCQ Test Series, Objective Questions with hints, solutions expected in Medical
and Dental Entrance Exams, Engineering Entrance Exams; JEE, MBBS Admission
Tests and such competitive exams.
Practice questions with solutions from some of
these topics (randomly selected):
Kinematics of Circular Motion;
Dynamics of Uniform Circular Motion; Centripetal Force;
Examples: vehicle on level circular road, vehicle on baked track; Angular Velocity
and is relation with Linear Velocity; Torque or Moment of Force and Angular Momentum;
Laws of Conservation of Angular Momentum; Theorems of perpendicular axes and
parallel axes; Kinematics of Rotational Motion about a fixed axis; Rolling Motion;
General relation among Position-Velocity-Acceleration for Motion in a plane and
Uniform Circular Motion; Centrifugal Force; Motion in a vertical circle;
Rotational Motion of a rigid body; Moment of Inertia; Angular Impulse.
Physics solved test series: Circular Motion, Rotational Motion
Multiple Choice Questions – Set 2 (Q
No 11-20)
MCQ 11: A
spool is pulled horizontally by two equal and opposite forces as shown in the
figure. Which of the following statements is correct ?
a. The centre
of mass moves towards left
b. The centre
of mass moves towards right
c. The centre
of mass remains stationary
d. The net
torque about the centre of mass of the spool is zero
MCQ 12: An
aeroplane revolves in a circle above the surface of the earth at a fixed height
with speed 100 km/hr. The change in velocity after completing ½ revolution will
be –
a. 200 km/hr
b. 150 km/hr
c. 300 km/hr
d. 400 km/hr
MCQ 13:
Angular momentum of a body is equal to the product of –
a. Moment of
inertia and angular velocity
b.
Centripetal force and radius
c. Linear
velocity and angular velocity
d. Mass and
angular velocity
MCQ 14: A car
of mass m is taking a circular turn of radius ‘r’ on a frictional level road
with a speed v. In order that the car does not skid –
MCQ 15: A
stone tied to the end of a string of 1 m long is whirled in a horizontal circle
with a constant speed. If the stone makes 22 revolutions in 44 seconds, what is
the magnitude and direction of acceleration of the stone?
a. π2 ms-2
and direction along the radius towards the centre
b. π2 ms-2
and direction along the radius away from the centre
c. π2 ms-2
and direction along the tangent to the circle
d. π2/4
ms-2 and direction along the radius towards the centre
MCQ
16: A particle of mass 2 kg is moving along a circular path of radius 1 m. If
its angular speed is 2 π rad s-1, the centripetal force on it is:
a.
4 π N
b.
8 π N
c.
4 π4 N
d.
8 π2 N
MCQ 17: Two
identical hollow spheres roll down two inclined planes of same height but of different
angles of inclination. Then, they reach the bottom –
a. With same
speeds and in same time
b. With
different speeds and in different times
c. With same
speed but in different times
d. With
different speeds in same time
MCQ 18: A
mass m is revolving in a vertical circle at the end of a string of length 20
cm. By how much times does the tension of the string at the lowest point exceed
the tension at the topmost point –
a. 2 mg
b. 4 mg
c. 6 mg
d. 8 mg
MCQ 19: Work
done by friction in case of pure rolling:
a. Is always
zero
b. Is always
positive
c. Is always
negative
d. May be
positive, negative or zero
MCQ 20: A car
is travelling at 36 kmph on a road. If µ = 0.5 between the tyres and the road,
the minimum turning radius of the car is – (g = 10 ms-2)
a. 20m
b. 25m
c. 30m
d.
35m
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