JEE Mains Practice physics questions with solutions

Showing 1–10 of 90 questions

• MCQeasyFluid Mechanics

  A cork of density 0.5 gcm-3 floats on a calm swimming pool. The fraction of the cork’s volume which is under water is :-

  Options

  • Option A

    0%

  • Option B

    25%

  • Option C

    10%

  • Option D

    50%

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• MCQmediumWave Motion

  Two pulses on a stretched string have centres initially 8 cm apart and move toward each other at 2 cm s⁻¹. After 2 s, what form does the total pulse energy have?

  

  Options

  • Option A

    Zero

  • Option B

    Purely kinetic

  • Option C

    Purely potential

  • Option D

    Partly kinetic and partly potential

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• MCQmediumFluid Mechanics

  Statement-1: Submarine sailors are advised not to allow a submarine to rest on the ocean floor. Statement-2: The force exerted by a liquid on a submerged body may be downward.

  Options

  • Option A

    Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1.

  • Option B

    Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation of Statement-1.

  • Option C

    Statement-1 is true and Statement-2 is false.

  • Option D

    Statement-1 is false and Statement-2 is true.

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• NumericeasyWave Motion

  In a resonance-column experiment, a long tube, open at the top, is clamped vertically. By a separate device, water level inside the tube can be moved up or down. The section of the tube from the open end to the water level act as a closed organ pipe. A vibrating tuning fork is held above the open end, first and the second resonances occur when the water level is 24.1 cm and 74.1 cm respectively below the open end. Find the diameter of the tube in cm.

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• MCQeasyFluid Mechanics

  In the case of a fluid, Bernoulli's theorem expresses the application of the principle of conservation of:-

  Options

  • Option A

    linear momentum

  • Option B

    energy

  • Option C

    mass

  • Option D

    angular momentum

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• MCQeasyWave Motion

  The displacement from the position of equilibrium of a point 4 cm from a source of sinusoidal oscillations is half the amplitude at moment t = T/6 (T is the time period). Assume that the source was at mean position at t = 0. The wavelength of the running wave is

  Options

  • Option A

    0.96 m

  • Option B

    0.48 m

  • Option C

    0.24 m

  • Option D

    0.12 m

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• NumericmediumFluid Mechanics

  A slender homogeneous rod of length 2L floats partly immersed in water, being supported by a string fastened to one of its ends, as shown. The specific gravity of the rod is 0.75. The length of rod that extends out of water is L.. Image

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• MCQmediumAtomic Structure and X-rays

  The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is

  Options

  • Option A

    802 nm

  • Option B

    823 nm

  • Option C

    1882 nm

  • Option D

    1648 nm

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• MCQeasyWave Motion

  Beats are heard when the A strings of two violins are played. The beat frequency decreases as the tension in the A string of violin 1 is slowly increased. Which of the following statement is correct?

  Options

  • Option A

    the fundamental frequency of the A string in violin 1 is less than that for violin 2.

  • Option B

    the fundamental frequency of the A string in violin 1 is greater than that for violin 2.

  • Option C

    the fundamental frequency of the A string in violin 1 may be greater or less than that for violin 2 depending on the linear mass densities of the two strings.

  • Option D

    None of these

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• MCQmediumNuclear physics

  In radioactive decay process, the negatively charged emitted β-particles are :

  Options

  • Option A

    the electrons orbiting around the nucleus

  • Option B

    the electrons present inside the nucleus

  • Option C

    the electrons produced as a result of the decay of neutrons inside the nucleus

  • Option D

    the electrons produced as a result of collisions between atoms

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