NEET 2020 physics questions with solutions

Showing 1–10 of 11 questions

• MCQeasyNewtons law of motion and Frictionsimple pulley problem

  Two masses 4 kg and 6 kg are attached to opposite ends of a light inextensible string passing over a frictionless pulley. Find acceleration as a fraction of g.

  

  Options

  • Option A

    g/2

  • Option B

    g/5

  • Option C

    g/10

  • Option D

    g

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• MCQeasyUnit dimension and errorDimension and its application

  Dimensional formula of stress is:

  Options

  • Option A

    [M L² T⁻²]

  • Option B

    [M L⁰ T⁻²]

  • Option C

    [M L⁻¹ T⁻²]

  • Option D

    [M L T⁻²]

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• MCQeasyRotational Motiontorque and rotational equilibrium

  A force 3$\hat{j}$N acts on a particle at r=2$\hat{k}$ m. Find its torque about the origin.

  Options

  • Option A

    6$\hat{j}$ N·m

  • Option B

    -6$\hat{i}$ N·m

  • Option C

    -6$\hat{k}$ N·m

  • Option D

    6$\hat{i}$ N·m

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• MCQmediumUnit dimension and errorError Analysis

  Time intervals measured by a clock gave the following readings: 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s. What is the percentage error of the observation?

  Options

  • Option A

    2%

  • Option B

    4%

  • Option C

    16%

  • Option D

    1.6%

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• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  At what depth d below Earth’s surface does acceleration due to gravity become 1/n of its surface value (Earth radius R)?

  Options

  • Option A

    R/n²

  • Option B

    R(n-1)/n

  • Option C

    Rn/(n-1)

  • Option D

    Rn

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• MCQmediumCenter of maas , Momentum and Collisioncenter of mass and question based on it

  Three identical spheres of mass M are at the corners of a right-angled triangle with mutually perpendicular sides of 2 m, as shown. Taking their intersection as origin, find the position vector of the centre of mass.

  

  Options

  • Option A

    2($\hat{i}+\hat{j}$) m

  • Option B

    ($\hat{i}+\hat{j}$) m

  • Option C

    (2/3)($\hat{i}+\hat{j}$) m

  • Option D

    (4/3)($\hat{i}+\hat{j}$) m

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• MCQeasyUnit dimension and errorsignificant number

  Taking into account the significant figures, what is the value of 9.99 m - 0.0099 m?

  Options

  • Option A

    9.98 m

  • Option B

    9.980 m

  • Option C

    2.25 × 10⁻¹⁵ m

  • Option D

    2.25 × 10¹⁵ m

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• MCQeasyRotational Motionquestion based on pure rotation about fixed axis

  A wheel increases angular speed from 360 revolutions per minute to 1200 revolutions per minute in 14 s. Find its angular acceleration.

  Options

  • Option A

    2π rad/s²

  • Option B

    28π rad/s²

  • Option C

    120π rad/s²

  • Option D

    1 rad/s²

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• MCQmediumNewtons law of motion and Frictionsimple pulley problem

  A 10 kg trolley on a horizontal track is connected by a string over a pulley to a hanging 2 kg block. Coefficient of kinetic friction between trolley and track is 0.05; g=10 m s⁻². Find their acceleration.

  

  Options

  • Option A

    1.25 m s⁻²

  • Option B

    1.50 m s⁻²

  • Option C

    1.66 m s⁻²

  • Option D

    1.00 m s⁻²

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• MCQeasyCenter of maas , Momentum and Collisioncenter of mass and question based on it

  Particles of masses 5 kg and 10 kg are at the ends of a light rigid rod of length 1 m. How far from the 5 kg particle is their centre of mass?

  Options

  • Option A

    50 cm

  • Option B

    67 cm

  • Option C

    80 cm

  • Option D

    33 cm

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