13 April 2023 physics questions with solutions

Showing 1–10 of 28 questions

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

  The radius of the second Bohr orbit of He⁺ is r₁, and the radius of the fourth orbit of Be³⁺ is r₂. If r₂/r₁ = x:1, find x.

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  Two bodies have kinetic energies in the ratio 16:9 and the same linear momentum. Their masses are in the ratio:

  Options

  • Option A

    16 : 9

  • Option B

    4 : 3

  • Option C

    9 : 16

  • Option D

    3 : 4

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• IntegermediumProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  A steel wire of length 20 m stores 80 J elastic energy when stretched by 2 cm. If Y = 2.0 × 10¹¹ N m⁻², find its cross-sectional area in mm².

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• IntegermediumRotational Motioncombined translatory and rotatory motion ,Pure rolling motion

  A solid sphere rolls without slipping. The ratio of its angular momentum about its rotation axis to its total kinetic energy is π:22. Find its angular speed in rad s⁻¹.

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• MCQmediumRotational Motioncombined translatory and rotatory motion ,Pure rolling motion

  A disc of radius R rolls without slipping. At t=0 the topmost material point is A. After the disc completes half a rotation, the displacement of A from its initial position is:

  

  Options

  • Option A

    2R√(1+4π²)

  • Option B

    R√(π²+4)

  • Option C

    2R

  • Option D

    R√(π²+1)

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• IntegermediumCurrent electricityelectric instruments

  A 5 Ω shunt converts a moving-coil galvanometer into a 250 mA ammeter. When 1050 Ω is connected in series with the same galvanometer, it gives full-scale deflection at 25 V. Find the galvanometer resistance in Ω.

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• MCQmediumKinematics part-3 Relative motionRelative motion in one dimension

  Trains A and B have lengths l and 4l and enter a tunnel of length L from opposite directions with speeds 108 km h⁻¹ and 72 km h⁻¹. Train A takes 35 s less than B to cross the tunnel. Given L = 60l, the tunnel length is:

  Options

  • Option A

    2700 m

  • Option B

    1800 m

  • Option C

    1200 m

  • Option D

    900 m

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• MCQeasyThermodyanmicsthermodynmic process and work done

  Under isothermal conditions, pressure varies as P = aV⁻³. The bulk modulus is:

  Options

  • Option A

    P/2

  • Option B

    2P

  • Option C

    P

  • Option D

    3P

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• IntegermediumGeometrical opticsapperant depth and shift due to slab

  A fish rises vertically upward at 8 m s⁻¹ and observes a bird apparently diving vertically toward it at 12 m s⁻¹. The refractive index of water is 4/3. Find the actual downward speed of the bird in m s⁻¹.

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• MCQmediumNuclear physicsNucles and its density radius and mass defect ,binding energy and its curve

  In the nuclear reaction ²³⁸₉₂A → ²³⁴₉₀B + ⁴₂D + Q, the masses are 238.05079 u, 234.04363 u and 4.00260 u. Using 1 u = 931.5 MeV/c², the energy released is:

  Options

  • Option A

    4.25 MeV

  • Option B

    5.9 MeV

  • Option C

    3.82 MeV

  • Option D

    2.12 MeV

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