12 April 2023 physics questions with solutions

Showing 1–10 of 27 questions

• MCQmediumWork , Power and Energykinetic enegy and work engery theorem

  Given below are two statements: Statement I: A truck and a car moving with the same kinetic energy are brought to rest by equal retarding forces. Both stop in equal distances. Statement II: A car moving east takes a turn and then moves north with unchanged speed. Its acceleration is zero. Choose the correct answer.

  Options

  • Option A

    Statement I is correct but Statement II is incorrect

  • Option B

    Statement I is incorrect but Statement II is correct

  • Option C

    Both statements are incorrect

  • Option D

    Both statements are correct

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• IntegermediumNuclear physicsradioactivity and law of decay

  In alpha decay, ²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He + Q. Given masses 238.05060 u, 234.04360 u and 4.00260 u, and 1 u = 931.5 MeV/c². The energy released, rounded to the numerical value accepted by the source, is ______ MeV.

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• MCQmediumThermodynamicsheat transfer due to radiation

  A body cools from 80°C to 60°C in 5 minutes. The surroundings are at 20°C. Using the approximation applied in the source solution, the time to cool from 60°C to 40°C is:

  Options

  • Option A

    500 s

  • Option B

    25/3 s

  • Option C

    450 s

  • Option D

    420 s

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• IntegereasyWork , Power and Energyquestion based on work

  A 500 kg bus moves at constant speed on a rough horizontal road for 4 km. If μ = 0.04 and g = 9.8 m s⁻², the work done by the engine is ______ kJ.

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• IntegereasyWave Motionstationary wave in sound and organ pipe ,resonance tube

  For a closed organ pipe, the first three resonance frequencies are in the ratio 1:3:5. If the fifth harmonic is 405 Hz and the speed of sound is 324 m s⁻¹, find the length of the pipe in metres.

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• MCQeasyMagnetism and matterproperties of magnetic substance

  Given below are two statements:

  Statement I: The diamagnetic property depends on temperature.

  Statement II: The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field. Choose the correct answer.

  Options

  • Option A

    Statement I is incorrect but Statement II is true

  • Option B

    Both Statement I and Statement II are true

  • Option C

    Both Statement I and Statement II are false

  • Option D

    Statement I is correct but Statement II is false

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• MCQeasyGravitationSatellites, Orbital Motion & Kepler’s Laws

  Two satellites A and B move around Earth in the same circular orbit. The mass of A is twice the mass of B. Which quantity is the same for both satellites?

  Options

  • Option A

    Potential energy

  • Option B

    Total energy

  • Option C

    Kinetic energy

  • Option D

    Speed

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• MCQeasyNewtons law of motion and Frictionequilibrium problem and newton first law

  Three forces F₁ = 10 N, F₂ = 8 N and F₃ = 6 N act on a 5 kg particle. F₂ and F₃ are perpendicular and the particle is initially at rest under all three forces. If F₁ is removed, the acceleration is:

  Options

  • Option A

    2 m s⁻²

  • Option B

    0.5 m s⁻²

  • Option C

    4.8 m s⁻²

  • Option D

    7 m s⁻²

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• A/ReasyElectromagnetic wavedisplacement current and properties of electromagnetic wave

  Given below are two statements: one is labelled Assertion A and the other is labelled Reason R.

  Assertion

  Electromagnetic waves used for optical communication have longer wavelengths than microwaves used in radar.

  Reason

  Infrared electromagnetic waves are more energetic than microwaves.

  Options

  • Option A

    A is false but R is true

  • Option B

    A is true but R is false

  • Option C

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

  • Option D

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

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• MCQmediumThermodynamicscyclic process its effeciency ,second law of thermodynamics

  An engine operating between the boiling and freezing points of water will have:
  1. efficiency more than 27%
  2. efficiency less than a Carnot engine operating between the same temperatures
  3. efficiency equal to 27%
  4. efficiency less than 27% Choose the correct answer.

  Options

  • Option A

    2, 3 and 4 only

  • Option B

    2 and 3 only

  • Option C

    2 and 4 only

  • Option D

    1 and 2 only

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