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__Physics: Circular Motion, Rotational Motion__

__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. 4π

^{2}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 m

_{1}and m_{2}are moving in circles of radii r_{1}and r_{2}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. m

_{1}: m_{2}
c. r

_{1}: r_{2}
d. m

_{1}m_{2}: r_{1}r_{2}
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*

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