15 April 2023 Morning Shift physics questions with solutions

Showing 1–10 of 29 questions

• IntegermediumMagnetic effect of currentMagnetic Field Produced by Moving Charges

  An electron in a hydrogen atom moves with speed 6.76 × 10⁶ m s⁻¹ in an orbit of radius 0.52 Å. Find the magnetic field at the nucleus, in tesla.

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• MCQmediumMathematical tools and vectorVector

  A vector in the x–y plane makes an angle 30° with the y-axis. Its y-component has magnitude 2√3. The magnitude of its x-component is:

  Options

  • Option A

    2

  • Option B

    √3

  • Option C

    1/√3

  • Option D

    6

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• MCQmediumNuclear physicsRadioactivity & Radioactive Decay Law

  The half-life of a radioactive nucleus is 5 years. The fraction of the original sample that decays in 15 years is:

  Options

  • Option A

    $\frac{3}{4}$

  • Option B

    1/8

  • Option C

    7/8

  • Option D

    1/4

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• IntegermediumWave MotionTransverse Waves on a Stretched String and Wave Speed

  The fundamental frequency of a string fixed at both ends is 50 Hz. Its mass is 18 g and linear mass density is 20 g m⁻¹. Find the transverse-wave speed in m s⁻¹.

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• MCQmediumElectromagnetic InductionSelf-Inductance, Induced EMF and Transient Analysis of L-R Circuits

  A 12 V battery is connected to a coil of resistance 6 Ω. The steady current is interrupted in 1 ms and the induced emf across the coil is 20 V. The inductance is:

  Options

  • Option A

    8 mH

  • Option B

    10 mH

  • Option C

    12 mH

  • Option D

    5 mH

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• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  A galvanometer has resistance 54 Ω and gives full-scale deflection at 1 mA. It is to be converted into a 50 V voltmeter and a 10 mA ammeter. Which statements are correct?

  A. voltmeter series resistance ≈ 50 kΩ,

  B. ammeter shunt ≈ 0.2 Ω,

  C. ammeter shunt ≈ 6 Ω,

  D. voltmeter series resistance ≈ 5 kΩ,

  E. voltmeter series resistance ≈ 500 Ω.

  Options

  • Option A

    C and D

  • Option B

    A and B

  • Option C

    C and E

  • Option D

    A and C

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• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  A body is released from rest at a height equal to Earth's radius R above the surface. Its speed on reaching Earth's surface is:

  Options

  • Option A

    √(gR)

  • Option B

    √(gR/2)

  • Option C

    √(4gR)

  • Option D

    √(2gR)

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• IntegermediumCapacitorEquivalent Capacitance & Capacitor Networks

  In the shown capacitor combination, the total charge stored is 100 μC. All capacitors are connected across 10 V and their equivalent capacitance is (5 + x) μF. Find x.

  

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• MCQmediumUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  The speed v of a water wave is assumed to depend on wavelength λ, gravitational acceleration g and water density ρ as v = λᵃgᵇρᶜ. The values of a, b and c are:

  Options

  • Option A

    1/2, 0, 1/2

  • Option B

    1, -1, 0

  • Option C

    1/2, 1/2, 0

  • Option D

    1, 1, 0

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• IntegermediumGeometrical opticsPrisms & Thin Prisms

  A transparent liquid of refractive index √2 fills an equilateral hollow prism. Find the angle of minimum deviation, in degrees.

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