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QUIZ

12th
grade

Physics

53%

accuracy

128

plays

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SHARMISTHA DATTA

3 years

Physics

12th

grade

Rotational Dynamics

user

SHARMISTHA DATTA

128
plays

20 questions

20 questions

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1. Multiple Choice
2 minutes
1 pt
The moments of inertia of two rotating bodies A and B about the same axis are I_A & I_B ( I_A > I_B ) and their angular momentum are equal. If K_A & K_Bare their rotational kinetic energies then......
K_A > K_B
K_A < K_B
K_A = K_B
K_A = K_B = 0
2. Multiple Choice
30 seconds
1 pt
A rigid body is rotating about an axis. to stop the rotation, we have to apply........
pressure
force
momentum
torque
3. Multiple Choice
1 minute
1 pt
Two rings have their moments of inertia in the ratio 2 : 1 and their diameters are in the ratio 2 : 1. The ratio of their masses will be..........
2 : 1
1 : 2
1 : 4
1 : 1
4. Multiple Choice
2 minutes
1 pt
A 2 kg mass is rotating on a circular path of radius 0.8 m with angular velocity of 44 rad/s. If the radius of the path becomes 1m, then the angular velocity will be ........
8.12 rad/s
19.28 rad/s
28.16 rad/s
35.26 rad/s
5. Multiple Choice
2 minutes
1 pt
A disc of mass 2 kg and radius 20 cm is free rotate about an axis through its centre and perpendicular to the disc. If a force of 50 N is applied tangentially to the disc, then the angular acceleration is.......
250 rad/s²
25 rad/s²
2.5 rad/s²
0.25 rad/s²
6. Multiple Choice
30 seconds
1 pt
For the uniform circular motion of a body, the direction of the centripetal force of a body.........
depends on the mass of the body
depends on the linear speed of the body
depends on the sense of rotation(clockwise or anticlockwise) of the body
does not depend on the sense of rotation(clockwise or anticlockwise) of the body
7. Multiple Choice
45 seconds
1 pt
A car is moving on a banked track of radius 10m with a constant speed of 10 m/s. The angle of banking is ........
(g = 10 m/s²)
90⁰
60⁰
45⁰
30⁰
8. Multiple Choice
2 minutes
1 pt
A cyclist moving at a speed of 20 m/s takes a turn. If he doubles his speed, then the chance of overturn........
is halved
is doubled
becomes 4 times
becomes 1/4 times
9. Multiple Choice
1 minute
1 pt
A coin is placed on a disc rotating at a speed of 45 rpm. It flies away when the rotational speed of the disc becomes 50 rpm. If another identical coin is placed on the first coin , then both of them will fly away when the rotational speed is.......
12.5 rpm
25 rpm
50 rpm
100 rpm
10. Multiple Choice
1 minute
1 pt
A stone of mass 16 kg is attached to a string 144 m long and is whirled in a horizontal circle. The maximum tension the string can withstand is 16 N. Then the maximum speed that can be given to the stone without breaking the string is.........
12 m/s
14 m/s
16 m/s
20 m/s
11. Multiple Choice
30 seconds
1 pt
Out of the following equations, which is the incorrect equation?
$\ \overrightarrow{\tau\ }\ =\ \overrightarrow{r\ }\ x\ \overrightarrow{F}$
$\overrightarrow{a_R}\ =\ \overrightarrow{\omega}\ x\ \overrightarrow{\ v}\$
$\overrightarrow{a_T}\ =\ \overrightarrow{\alpha\ \ }\ x\ \ \overrightarrow{r\ }$
$\overrightarrow{v\ \ }=\overrightarrow{r\ }\ x\ \ \overrightarrow{\omega}$
12. Multiple Choice
30 seconds
1 pt

The formula for the period of the conical pendulum is ......
$\frac{1}{2\pi}\sqrt{\frac{l\cos\theta}{g}}$
$\frac{1}{2\pi}\sqrt{\frac{l\sin\theta}{g}}$
$4\pi\sqrt{\frac{l\cos\theta}{4g}}$
$4\pi\sqrt{\frac{l\tan\theta}{g}}$
13. Multiple Choice
20 seconds
1 pt
The bulging of the earth at the equator is due to ......
centripetal force
centrifugal force
gravitational force
electrostatic force
14. Multiple Choice
1 minute
1 pt
The angular separation between the minute hand and the hour hand of a clock at 12:20 p.m. is......
90⁰
100⁰
110⁰
120⁰
15. Multiple Choice
45 seconds
1 pt
A circular disc rotates about an axis passing through its centre with a certain angular velocity. Suddenly a small piece of the disc breaks from the edge and falls down. Then ........
its M.I. will increase and the angular velocity will decrease
its M.I. will decrease and the angular velocity will increase
both, the M.I. and the angular velocity will increase
both, the M.I. and the angular velocity will decrease
16. Multiple Choice
20 seconds
1 pt
The moment of inertia of a body does not depend on ......
the mass of the body
the angular velocity of the body
the axis of rotation of the body
the distribution of the mass of the body
17. Multiple Choice
30 seconds
1 pt
The shaft of a motor rotates at a constant angular velocity of 3000 rpm. In 1 second its angular displacement in radian is .....
$1000\pi$
$100\pi$
$10\pi$
$\pi$
18. Multiple Choice
1 minute
1 pt
The radius of gyration of a disc of radius R rotating about an axis perpendicular to its plane and tangential to the disc is .........
$\sqrt{\frac{3}{2}}\ R$
$\frac{3}{2}R$
$\frac{R}{\sqrt{2}}$
$\frac{R}{2}$
19. Multiple Choice
45 seconds
1 pt
A body of M.I. 5 kg-m² rotating with an angular velocity of 6 rad/s has the same kinetic energy as a mass of 20 kg moving with a velocity of ........
12m/s
9 m/s
6 m/s
3 m/s
20. Multiple Choice
2 minutes
1 pt
A thin wire of length L and uniform linear mass density d is bent into a circular ring. Moment of inertia of the coil about a tangential axis in its plane is ...........
$\frac{3dL^2}{8\pi^2}$
$\frac{8\pi^2}{3dL^3}$
$\frac{3dL^3}{8\pi^2}$
$\frac{8\pi}{3dL^2}$
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