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Physics NEET Questions — Free MCQ Practice

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A particle of mass m slides down on inclined plane and reaches the bottom with
linear velocity V. If the same mass is in the form of ring and rolls without slipping down the same inclined plane. Its velocity will be .

A. V B. $ \sqrt V $ C. $ { V \over \sqrt 2 } $ D. 2V

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Explanation

$ Here in first case { 1 \over 2} mg^2 = mvh $ $ \therefore v = \sqrt { 2 gh } $ $ as for the ring K = R v' = \sqrt {gh} $

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Match list I with list II and select the correct answer. List - I System (x) A ring about it axis (y) A uniform circular disc about it axis (z) A solid sphere about any diameter (w) A solid sphere about any tangent

List - II (1) $ { M R^2 \over 2 } $ (2) $ { 2\over 5 } MR^2 $ (3) $ { 7 \over5 } MR^2 $ (4) $ MR^2 $ (5) $ { 9 \over 5 } MR^2 $

A. x-2 , y-1 , z -3 ,w-4 B. x-4 , y-3 , z -2 ,w-5 C. x-1 , y-5 , z -4 ,w-3 D. x-4 , y-1 , z -2 ,w-3

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Explanation

The moments of inertia for different systems are as follows:

For a ring about its axis: $MR^2$
For a uniform circular disc about its axis: $\frac{MR^2}{2}$
For a solid sphere about any diameter: $\frac{2}{5} MR^2$
For a solid sphere about any tangent: $\frac{7}{5} MR^2$ Thus, the correct matching is: x-4, y-1, z-2, w-3.

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Statement -1 â€” The angular momentum of a particle moving in a circular orbit with a constant speed remains conserved about any point on the circumference of the circle. Statement -2â€” If no net torque outs, the angular momentum of a system is conserved

A. Statement - 1 is correct (true), Statement - 2 is true and Statement- 2 is correct explanation for Statement - 1 B. Statement -1 is true, statement -2 is true but statement-2 is not the correct explanation four statement -1. C. Statement - 1 is true , Statement -2 is false D. Statement - 1 is false , Statement -2 is true

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Explanation

The correct choice is [D] since the centrifetal force is radial. Forque is zero so L = constant.

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Statement -1— A sphere and a cylinder slide without rolling from rest from the top of an inclined plane. They will reach the bottom with the same speed.

Statement -2 — Bodies of all shapes, masses and sides slide down a plane with the same acceleration.

A.

Statement - 1 is correct (true), Statement - 2 is true and Statement- 2 is correct explanation for Statement - 1

B.

Statement -1 is true, statement -2 is true but statement-2 is not the correct explanation four statement -

C.

Statement - 1 is true , Statement -2 is false

D.

Statement - 1 is false , Statement -2 is true

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Explanation

The correct choice is [A] If a body slides down an indined plane its acaleration is $ a = g (sin \theta – \mu cos \theta )$ which depends only on g, $ \theta $ and $ \mu $ .

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Statement -1â€” Friction is necessary for a body to roll on surface Statement -2â€” Friction provides the necessary tangential force and torque

A. Statement - 1 is correct (true), Statement - 2 is true and Statement- 2 is correct explanation for Statement - 1 B. Statement -1 is true, statement -2 is true but statement-2 is not the correct explanation four statement -1. C. Statement - 1 is true , Statement -2 is false D. Statement - 1 is false , Statement -2 is true

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Explanation

Statement - 1 is correct because friction is necessary for rolling motion to occur as it prevents slipping. Statement - 2 is also correct because friction provides the necessary tangential force and torque needed for rolling. Thus, statement - 2 is the correct explanation for statement - 1.

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A Solid sphere of mass M and radius R is released from rest at the top of a frictionless inclined plane of length 'd' and inclinatSolid spion ?. In case (a) it rolls down the plane without slipping and in case (b) it slides down the plane The ratio of the velocity of the spheres when it reaches the bottom of the plane in case (a) to that in case (b) is

A. $ \sqrt 2 $ B. $ \sqrt { 2 \over 3 } $ C. $ \sqrt { 5 \over 7 } $ D. $ { \sqrt \over 3} $

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Explanation

$ using V^2 = 2 ad we can find $ $ { v_1^2 \over v_2^2 } = { a_1 \over a_2 } = \sqrt { 5 \over 7 } $

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A Solid sphere of mass M and radius R is released from rest at the top of a frictionless inclined plane of length 'd' and inclinatSolid spion ?. In case (a) it rolls down the plane without slipping and in case (b) it slides down the plane The ratio of the velocity of the spheres when it reaches the bottom of the plane in case (a) to that in case (b) is

A. 1 B. $ \sqrt { 3 \over 2} $ C. $ \sqrt 2 $ D. $ \sqrt { 7 \over 5 } $

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Explanation

$ from d = { 1 \over 2 } a t ^2 , we find that { d_1 \over d_2 }= \sqrt{ 7 \over 5 } $

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A uniform disc of mass M and radius R rolls without slipping down a plane inclined at an angle $ \theta $ with the horizontal. The acceleration of the centre of mass of the disc is

A. $ g sin \theta $ B. $ { 2 g sin \theta \over 3 } $ C. $ { g sin \theta \over 3 } $ D. $ {2 g cos \theta \over 3 } $

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Explanation

$ Mg sin \theta - f = Ma $ $ \tau = I . \alpha $ $ As I = { 1 \over 2} MR^2 , \alpha = { a \over R} and \tau = fR$ $ Hence fR = { 1 \over 2} MR^2 . { a \over R } = { 1 \over 2 } MRa $

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A uniform disc of mass M and radius R rolls without slipping down a plane inclined at an angle $ \theta $ with the horizontal The frictional force on the disc is

A. $ { Mg sin \theta \over 3 } $ B. $ { 2 Mg sin \theta \over 3 } $ C. $ { Mg sin \theta } $ D. None

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Explanation

$ f = { 1 \over 2} Ma $ $ \therefore f = { Mg sin \theta \over 3 } $

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A uniform disc of mass M and radius R rolls without slipping down a plane inclined at an angle $ \theta $ with the horizontal. If the disc is replaced by a ring of the same mass M and the same radius R, the ratio of the frictional force on the ring to that on the disc will be

A. 3/2 B. 2 C. $ \sqrt 2 $ D. 1

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Explanation

For a ring $ I = MR^2 $

Physics MCQs for NEET — Practice Questions with Answers

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