8 April 2023 physics questions with solutions

Showing 1–10 of 57 questions

• NumericmediumProperties of solid and fluidViscosity, Stokes' Law and Terminal Velocity

  An air bubble of diameter 6 mm rises steadily through a solution of density 1750 kg m⁻³ at 0.35 cm s⁻¹. The coefficient of viscosity of the solution is ______ Pa s. [Neglect density of air, g = 10 m s⁻²]

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

  The ratio of magnetic field at the centre of a current-carrying coil of radius r to the magnetic field at a distance r from the centre of the coil on its axis is √x : 1. The value of x is ______.

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• MCQeasyThermodynamicsKinetic Theory of Gases and Molecular Properties

  The temperature at which the kinetic energy of oxygen molecules becomes double than its value at 27°C is

  Options

  • Option A

    1227°C

  • Option B

    627°C

  • Option C

    327°C

  • Option D

    927°C

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• MCQmediumCircular MotionKinematics of Circular Motion

  For particle P revolving about centre O in a circle of radius r with angular velocity ω, as shown in the figure, the projection of OP on the x-axis at time t is:

  

  Options

  • Option A

    x(t) = r cos(ωt + π/6)

  • Option B

    x(t) = r cos(ωt - π/6)

  • Option C

    x(t) = r cos(ωt)

  • Option D

    x(t) = r sin(ωt + π/6)

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• NumericmediumThermodynamicsThermal Expansion of Solids and Liquids

  A steel rod of length 1 m and cross-sectional area 10⁻⁴ m² is heated from 0°C to 200°C without being allowed to extend or bend. The compressive force produced is ______ × 10⁴ N. [Young's modulus = 2 × 10¹¹ N m⁻², coefficient of linear expansion = 10⁻⁵ K⁻¹]

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• MCQmediumGravitationSatellites, Orbital Motion & Kepler’s Laws

  Given below are two statements:

  Statement I: If E is the total energy of a satellite moving around the Earth, then its potential energy is E/2.

  Statement II: The kinetic energy of a satellite revolving in an orbit is equal to half the magnitude of total energy E.

  In the light of the above statements, choose the most appropriate answer from the options given below:

  Options

  • Option A

    Both Statement I and Statement II are incorrect

  • Option B

    Statement I is incorrect but Statement II is correct

  • Option C

    Statement I is correct but Statement II is incorrect

  • Option D

    Both Statement I and Statement II are correct

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• MCQeasyNewtons law of motion and FrictionNewton's Law of Motion & Equilibrium

  Two forces having magnitudes A and A/2 are perpendicular to each other. The magnitude of their resultant is:

  Options

  • Option A

    5A/2

  • Option B

    √5 A²/2

  • Option C

    √5 A/4

  • Option D

    √5 A/2

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• NumericmediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  The moment of inertia of a semicircular ring about an axis through its centre and perpendicular to its plane is (1/x)MR², where R is radius and M is mass. Find x.

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• NumericmediumRotational MotionRolling Motion on Inclined Planes

  A hollow spherical ball of uniform density rolls up a curved surface with an initial velocity 3 m/s (as shown in figure). Maximum height with respect to the initial position covered by it will be _________ cm (take, g = 10 m s⁻²)

  

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• MCQeasyAtomic Structure and X-raysX-Rays: Production, Types & Properties

  The waves emitted when a metal target is bombarded with high energy electrons are

  Options

  • Option A

    Microwaves

  • Option B

    X-rays

  • Option C

    Radio Waves

  • Option D

    Infrared rays

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