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Physics MCQs for NEET — Practice Questions with Answers

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A child is standing with folded hands at the centre of a platform rotating about its central axis the kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

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Explanation

$ E = { L^2 \over 2I } = K given K \alpha { 1 \over I } $ If L is constant when child stretches his arms the moment of inertia of system get doubled so kinetic energy will becomes half i.e $ { K \over 2 } $

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If the earth is treated as a sphere of radius R and mass M. Its angular momentum about the axis of rotation with period T is…..

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Explanation

Moment of inertia of sphere $ I = { 2 \over 5 } MR^2 $ about its axis $ L = I \omega $

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If the angular momentum of any rotating body increases by 200%, then the increase in its kinetic energy will be…..

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Explanation

$ E = { L^2 \over 2 I } $ $ E \alpha L^2 $

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The M.I. of a body about the given axis is 1.2 kgm2 initially the body is at rest. In order to produce a rotational kinetic energy of 1500 J. an angular acceleration of $ 25 rad / sec ^2 $ must be applied about that axis for duration of ….

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Explanation

$ Rotational K.E. = { 1 \over 2} I \omega^2 = 1500 $ $ According to w = wo + \alpha t $

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An automobile engine develops 100kw when rotating at a speed of 1800 r.p.m. what torque does it deliver ?

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Explanation

$ \omega = 1800 rpm = { 2 \pi \times 1800 \over 60 } = 60 \pi rad /sec $

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The moment of inertia of two rotating bodies A and B are $ I_A $ and $I_B $ . $ ( I_A \gt I_B ) $ and their angular momentum are equal. If their K.E. be $ K_A and K_B $ respectively

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Explanation

$ As K = { I^2 \over 2I } , K_A = { J^2 \over 2I_A}, and K_B = { J^2 \over 2 I_B} $

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If distance of the earth becomes three times that of the present distance from the sun then number of days in one year will be ….

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Explanation

$ { T_2 ^ 2 \over T_1^2 } = { r_2^3 \over r_1^3 } $

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A solid sphere and a solid cylinder having same mass and radius roll down the same incline the ratio of their acceleration will be….

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Explanation

$ a = { g sin \theta \over ( 1 + k^2 / R^2 ) } \therefore a_1 = { 5 g sin \theta \over 7 } and a_2 = { 2 g sin \theta \over 3 } $

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The ratio of angular momentum of the electron in the first allowed orbit to that in the second allowed orbit of hydrogen atom is

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Explanation

$ L = { nh \over 2 \pi } $

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A player caught a cricket ball of mass 150 gm moving at a rate of 20 m/s If the catching process is Comlitad in 0.1 sec the force of the flow exerted by the ball on the hand of the player ….. N

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Explanation

$ Impulse = Change in momentum = F \times t $ $ \therefore F = { \triangle L \over \triangle t } $

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