30 January 2023 physics questions with solutions

Showing 1–10 of 58 questions

• NumericmediumCurrent electricityCircuit Theory & Kirchhoff’s Laws

  If the potential difference between B and D is zero, the value of x is 1/n Ω. The value of n is ______.

  

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  JEE Mains30 January 2023Shift 2Evening Shift

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• NumericeasyThermodynamicsheat and principle of calorimeter

  A faulty thermometer reads 5°C in melting ice and 95°C in steam. The correct temperature on absolute scale will be ______ K when the faulty thermometer reads 41°C.

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  JEE Mains30 January 2023Shift 2Evening Shift

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• NumericmediumWave Opticsyoung's dubble slit experiments

  In Young’s double slit experiment, two slits S₁ and S₂ are d distance apart and the separation from slits to screen is D. If two transparent slabs of equal thickness 0.1 mm but refractive indices 1.51 and 1.55 are introduced in the paths from S₁ and S₂ respectively, with λ = 4000 Å, the central bright fringe spot will shift by ______ number of fringes.

  

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• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  An object is allowed to fall from a height R above the earth, where R is the radius of earth. Its velocity when it strikes the earth’s surface, ignoring air resistance, will be:

  Options

  • Option A

    2√(gR)

  • Option B

    √(gR)

  • Option C

    √(gR/2)

  • Option D

    √(2gR)

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• MCQeasyCenter of maas , Momentum and Collisionmomentum and conservation of momentum

  A machine gun of mass 10 kg fires 20 g bullets at the rate of 180 bullets per minute with a speed of 100 m s⁻¹ each. The recoil velocity of the gun is:

  Options

  • Option A

    0.02 m s⁻¹

  • Option B

    2.5 m s⁻¹

  • Option C

    1.5 m s⁻¹

  • Option D

    0.6 m s⁻¹

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• NumericmediumCurrent electricityCircuit Theory & Kirchhoff’s Laws

  In the following circuit, the magnitude of current I₁ is _____ A.

  

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• MCQmediumMagnetic effect of currentbiot savart law and magnetic field due to straight conductor ,arc and ring

  As shown in the figure, a current of 2 A flows in an equilateral triangle of side 4√3 cm. The magnetic field at the centroid O of the triangle is: [Neglect Earth’s magnetic field.]

  

  Options

  • Option A

    4√3 × 10⁻⁴ T

  • Option B

    4√3 × 10⁻⁵ T

  • Option C

    √3 × 10⁻⁴ T

  • Option D

    3√3 × 10⁻⁵ T

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• MCQeasySimple Harmonic Motiontime period of linear shm

  For a simple harmonic motion in a mass-spring system shown, the surface is frictionless. When the mass of the block is 1 kg, the angular frequency is ω₁. When the mass of the block is 2 kg, the angular frequency is ω₂. The ratio ω₂/ω₁ is:

  

  Options

  • Option A

    √2

  • Option B

    1/√2

  • Option C

    2

  • Option D

    1/2

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• NumericmediumNuclear physicsradioactivity and law of decay

  A radioactive nucleus decays by two different processes. The half-life of the first process is 5 minutes and that of the second process is 30 s. The effective half-life of the nucleus is α/11 s. The value of α is ______.

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• MCQmediumsemiconductorlogic gate

  The output Y for the inputs A and B of the circuit is given by. The truth table of the shown circuit is:

  

  Options

  • Option A

    A B Y

    0 0 1

    0 1 1

    1 0 1

    1 1 0

  • Option B

    A B Y

    0 0 1

    0 1 0

    1 0 0

    1 1 1

  • Option C

    A B Y

    0 0 0

    0 1 1

    1 0 1

    1 1 1

  • Option D

    A B Y

    0 0 0

    0 1 1

    1 0 1

    1 1 0

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