# Assertion : The speed of whirlwind in a tornado is alarmingly high. Reason    : If no external torque acts on a body, its angular velocity remains conserved. 1. If both assertion and reason are true and reason is the correct explanation of assertion. 2. If both assertion and reason are true but reason is not the correct explanation of assertion. 3. If assertion is true but reason is false. 4. If both assertion and reason are false.

Subtopic:  Angular Momentum |
From NCERT
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A circular disc A of radius r is made from an iron plate of thickness t and another circular disc B of radius 2r and thickness $\frac{\mathrm{t}}{4}$. The relation between moments of inertia ${\mathrm{I}}_{\mathrm{A}}$ and ${\mathrm{I}}_{\mathrm{B}}$ is

1.

2.

3.

4.  Depends on the actual values of t and r

Subtopic:  Moment of Inertia |
66%
From NCERT
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A particle of mass 2 kg located at the position  m has a velocity of 2 m/s. Its angular momentum about z-axis in kg-${\mathrm{m}}^{2}/\mathrm{s}$ is :

1. +4

2. +8

3. -4

4. -8

Subtopic:  Angular Momentum |
From NCERT
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A cylinder of mass 'M' is suspended by two strings wrapped around it as shown. The acceleration 'a' and the tension T when the cylinder falls and the string unwinds itself are, respectively,

1.

2.

3.

4.

Subtopic:  Rolling Motion (OLD NCERT) |
From NCERT
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An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver ?

1. 350 N-m

2. 440 N-m

3. 531 N-m

4. 628 N-m

Subtopic:  Torque |
69%
From NCERT
PMT - 2000
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In an orbital motion, the angular momentum vector is

2. Parallel to the linear momentum

3. In the orbital plane

4. Perpendicular to the orbital plane

Subtopic:  Angular Momentum |
75%
From NCERT
AIIMS - 2004
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A particle of mass m moves with a constant velocity along 3 different paths, DE, OA and BC. Which of the following statements is not correct about its angular momentum about point O?

 1 It is zero when it is at A and moving along OA. 2 The same at all points along the line DE. 3 Of the same magnitude but oppositely directed at B and  D. 4 Increases as it moves along the line BC.

Subtopic:  Angular Momentum |
53%
From NCERT
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Subtopic:  Angular Momentum |
84%
From NCERT
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A sphere is rolling down a plane of inclination $\theta$ to the horizontal.  The acceleration of its centre down the plane is

1. g sin $\theta$

2. less than g sin $\theta$

3. greater than g sin $\theta$

4. zero

Subtopic:  Rolling Motion (OLD NCERT) |
67%
From NCERT
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A bob of mass m attached to an inextensible string of length l is suspended from vertical support.  The bob rotates in a horizontal circle with an angular speed $\mathrm{\omega }$ $\mathrm{rad}/\mathrm{s}$ about the vertical.  About the point of suspension.

 1 Angular momentum is conserved 2 Angular momentum changes in magnitude but not in the direction 3 Angular momentum changes in direction but not in magnitude 4 Angular momentum changes both in direction and magnitude

Subtopic:  Angular Momentum |
From NCERT
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