12 April 2023 physics questions with solutions

Showing 1–10 of 27 questions

• IntegermediumFluid Mechanicsequation of continuity and bornullie theorem

  Glycerine of density 1.25 × 10³ kg m⁻³ flows through a conical pipe. End areas are 10 cm² and 5 cm², and pressure drop is 3 N m⁻². The volume-flow rate is x × 10⁻⁵ m³ s⁻¹. Find x.

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• MCQmediumAc Cirucuitsseries combination of ac circuit and L-C-R circuit

  Given below are two statements: Statement I: As the frequency of an AC source in a series LCR circuit is increased, the current first increases, reaches a maximum, and then decreases.

  Statement II: At resonance in a series LCR circuit, the power factor is one. Choose the correct answer.

  Options

  • Option A

    Statement I is incorrect but Statement II is true

  • Option B

    Both statements are false

  • Option C

    Statement I is correct but Statement II is false

  • Option D

    Both statements are true

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• IntegermediumCurrent electricityelectric current ,current density and resistance

  The current through a conductor at 0°C and 100°C, for the same voltage source, is 2 A and 1.2 A respectively. The current at 50°C is ______ × 10² mA.

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• MCQeasySimple Harmonic Motionkinetic and potential energy in shm

  A particle executes SHM. The ratio of potential energy to kinetic energy when its displacement is half the amplitude is:

  Options

  • Option A

    1 : 1

  • Option B

    2 : 1

  • Option C

    1 : 4

  • Option D

    1 : 3

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• MatcheasyUnit dimension and errorDimension and its application

  Match List I with List II.

  List 1

  1. (A) Spring constant

  2. (B) Angular speed

  3. (C) Angular momentum

  4. (D) Moment of inertia

  List 2

  1. I. [T⁻¹]

  2. II. [MT⁻²]

  3. III. [ML²]

  4. IV. [ML²T⁻¹]

  Options

  • Option A

    A-II, B-I, C-IV, D-III

  • Option B

    A-IV, B-I, C-III, D-II

  • Option C

    A-II, B-III, C-I, D-IV

  • Option D

    A-I, B-III, C-II, D-IV

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• MCQeasyThermodyanmicskinetic therory of gaseous

  If the rms speed of chlorine molecules is 490 m s⁻¹ at 27°C, the rms speed of argon molecules at the same temperature is: (atomic mass of Ar = 39.9 u, molecular mass of Cl₂ = 70.9 u)

  Options

  • Option A

    751.7 m s⁻¹

  • Option B

    451.7 m s⁻¹

  • Option C

    651.7 m s⁻¹

  • Option D

    551.7 m s⁻¹

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• MCQeasyCurrent electricityelectric current ,current density and resistance

  A wire of resistance 160 Ω is melted and drawn into a wire of one-fourth its original length. The new resistance is:

  Options

  • Option A

    10 Ω

  • Option B

    640 Ω

  • Option C

    40 Ω

  • Option D

    160 Ω

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• IntegereasyElectrostaticspotential energy and electric potential

  64 identical conducting drops, each at potential 10 mV, combine to form one bigger drop. The potential of the bigger drop is ______ mV.

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• 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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• MCQmediumAtomic Structure and X-raysatomic structure and bohr atomic model

  A 12.5 eV electron beam bombards gaseous hydrogen at room temperature. The number of different spectral lines emitted is:

  Options

  • Option A

    2

  • Option B

    1

  • Option C

    3

  • Option D

    4

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