1 February 2023 physics questions with solutions

Showing 1–10 of 29 questions

• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  If Earth has mass nine times and radius twice that of a planet P, then (vₑ/3)√x m s⁻¹ will be the minimum velocity required by a rocket to escape from gravitational force of P, where vₑ is escape velocity on Earth. The value of x is:

  Options

  • Option A

    2

  • Option B

    3

  • Option C

    18

  • Option D

    1

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• MCQmediumMagnetic effect of currentBiot-Savart Law and Magnetic Field Due to Straight Wires, Circular Arcs and Loops

  Find the magnetic field at point P in figure. The curved portion is a semicircle connected to two long straight wires.

  

  Options

  • Option A

    μ₀I/(2r) [1 + 2/π]

  • Option B

    μ₀I/(2r) [1 + 1/π]

  • Option C

    μ₀I/(2r) [1/2 + 1/(2π)]

  • Option D

    μ₀I/(2r) [1/2 + 1/π]

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• NumericmediumMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  A charged particle of 2 μC, accelerated by a potential difference of 100 V, enters a uniform magnetic field of magnitude 4 mT at right angle to the field. It completes a semicircle of radius 3 cm inside the magnetic field. The mass of the charged particle is _____ × 10⁻¹⁸ kg.

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• MCQeasyWave MotionTransverse Waves on a Stretched String and Wave Speed

  A steel wire with mass per unit length 7.0 × 10⁻³ kg m⁻¹ is under tension of 70 N. The speed of transverse waves in the wire will be:

  Options

  • Option A

    200π m s⁻¹

  • Option B

    100 m s⁻¹

  • Option C

    10 m s⁻¹

  • Option D

    50 m s⁻¹

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

  In an experiment to find emf of a cell using a potentiometer, the null-point length for a cell of emf 1.5 V is 60 cm. If this cell is replaced by another cell of emf E, the null-point length increases by 40 cm. If E = x/10 V, the value of x is ______.

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• MCQmediumThermodynamicsThermodynamic Processes, P-V Diagrams and Work Done

  A sample of gas at temperature T is adiabatically expanded to double its volume. The work done by the gas in the process is: [γ = 3/2]

  Options

  • Option A

    TR(√2 - 2)

  • Option B

    (T/R)(√2 - 2)

  • Option C

    (R/T)(2 - √2)

  • Option D

    RT(2 - √2)

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• NumericmediumRotational MotionRolling Motion on Inclined Planes

  A solid cylinder is released from rest from the top of an inclined plane of inclination 30° and length 60 cm. If it rolls without slipping, its speed at the bottom is ______ m s⁻¹. [g = 10 m s⁻²]

  

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• MCQmediumElectrostaticElectric Flux & Gauss’s Law

  Let σ be the uniform surface charge density of two infinite thin plane sheets shown in figure. The electric fields in the three regions I, II and III are:

  

  Options

  • Option A

    E(I) = -(σ/ε₀)n̂, E(II)=0, E(III)=(σ/ε₀)n̂

  • Option B

    E(I)=0, E(II)=(σ/ε₀)n̂, E(III)=0

  • Option C

    E(I)=(σ/2ε₀)n̂, E(II)=0, E(III)=(σ/2ε₀)n̂

  • Option D

    E(I)=-(σ/ε₀)n̂, E(II)=0, E(III)=(σ/ε₀)n̂

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• MCQeasyPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  A proton moving with one tenth of velocity of light has a certain de Broglie wavelength λ. An alpha particle having certain kinetic energy has the same de Broglie wavelength λ. The ratio of kinetic energy of proton to that of alpha particle is:

  Options

  • Option A

    2 : 1

  • Option B

    4 : 1

  • Option C

    1 : 2

  • Option D

    1 : 4

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• MatcheasyElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  Match List I with List II.

  List 1

  1. A. Microwaves

  2. B. Gamma rays

  3. C. Radio waves

  4. D. X-rays

  List 2

  1. I. Radioactive decay of the nucleus

  2. II. Rapid acceleration and deceleration of electron in aerials

  3. III. Inner shell electrons

  4. IV. Klystron valve

  Options

  • Option A

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

  • Option B

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

  • Option C

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

  • Option D

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

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