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(A) : The angular velocity of a plantets...

(A) : The angular velocity of a plantets orbiting around the sun increases when they are nearest to the sun.
(R ) : The angular momentum of body is a proportional to angular velocity.

A

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

B

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

C

(A) is true but (R ) is false

D

Both (A) and (R ) are false

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-EXERCISE - 1B
  1. (A) : Angular velocity increases when a boy on turn table rotating abo...

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  2. (A) : If earth shrink to half its present size, length of the day woul...

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  3. (A) : The angular velocity of a plantets orbiting around the sun incre...

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  4. (A) : A person standing on a rotating platform suddenly stretcehed his...

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  5. (A) : The spin angular velocity of a star is greatly enhanced when it ...

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  6. (A) : When there is no external torque moment of inertia of a rotating...

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  7. (A) : Power associated with torque is product of torque and angular sp...

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  8. (A) : When a rigid body rotates there is always a fixed axis or a fix ...

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  9. (A) : Angular velocity of all the particles are same when a rigid body...

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  10. (A) : Direction of angular velocity is always perpendicular to plane o...

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  11. (A) : Two solid cylinders of different masses and radii take same time...

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  12. (A) : A body slides down the plane and another body of same mass rolls...

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  13. (A) : A solid sphere and hollow sphere when released from the top of a...

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  14. (A) : A disc released from the top of a fixed inclined plane rolls dow...

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  15. (A) : The total kinetic enery of rolling solid sphere is the sum of tr...

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  16. (A) : A sphere cannot roll on a smooth inclined surface. (R ) : Fo...

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  17. (A) : A body roll down an inclined plane without slipping. The fractio...

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  18. Assertion (A):It polar ice cap melts , duration of the day increases. ...

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  19. (A) : A judo fighter in order to throw his opponent on to the mat trie...

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  20. (A) : The size and shape of the rigid body remains unaffected under th...

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