Physics: Circular Motion, Rotational Motion
Physics MCQ Test Series solved
questions for NEET-ug, IIT JEE, COMEDK, MBBS and BDS admission tests,
Engineering Entrance Exams and other such competitive exams.
Syllabus for
NEET and IIT JEE:
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.
Solved
MCQ Test Series – Set 3 (Q. No. 21-30)
Question 21:
The angular speed of a fly wheel making 120 rev/min is:
a. 2π rad/s
b. 4π2
rad/s
c. π rad/s
d. 4π rad/s
Question 22:
A child is swinging a swing, minimum and maximum heights of swing from earth’s
surface are 0.75 m and 2 m respectively. The maximum velocity of this swing is
–
a. 5 m/s
b. 10 m/s
c. 15 m/s
d. 20 m/s
Question 23:
An aeroplane is flying with a uniform speed of 100 m/s along a circular path of
radius 100 m. The angular speed of the aeroplane will be:
a. 1 rad/s
b. 2 rad/s
c. 3 rad/s
d. 4 rad/s
Question 24:
A block of mass m slides down along the surface of the bowl from the rim to the
bottom as shown in fig. The velocity of the block at the bottom will be –
Question 25:
When a body moves with a constant speed along a circle:
a. Its
velocity remains constant
b. No force
acts on it
c. No work is
done on it
d. No
acceleration is produced on it
Question 26:
A 1 kg ball is rotated in a vertical circle by using a string of length 0.1 m.
If the tension in the string at the lowest point is 29.4 N, its angular
velocity at that position is –
a. 7 rads-1
b. 14 rads-1
c. 3.5 rads-1
d. 25.6 rads-1
Question 27:
A cyclist moves in a circular track of radius 100 m. If the coefficient of
friction is 0.2. Then the maximum speed with which the cyclist take a turn
without leaning inwards is:
a. 14.0 m/s
b. 140 m/s
c. 1.4 m/s
d. 9.8 m/s
Question 28:
If all objects on the equator of earth feel weightless then the duration of the
day will nearly become –
a. 6.2 hr
b. 4.4 hr
c. 2.2 hr
d. 1.41 hr
Question 29:
Two racing cars of masses m1 and m2 are moving in circles
of radii r1 and r2 respectively. Their speeds are such
that each makes a complete circle in the same time t. The ratio of the angular
speeds of the first to the second car is:
a. 1: 1
b. m1:
m2
c. r1:
r2
d. m1m2:
r1r2
Question 30: A
2 kg stone is swung in a vertical circle by attaching it at the end of a string
of length 2m. If the string can withstand a tension 140.6 N, the maximum speed
with which the stone can be rotated is –
a. 22 ms-1
b. 44 ms-1
c. 33 ms-1
Circular and Rotational Motions - More Questions Answers
