22 January Evening Shift physics questions with solutions

Showing 1–10 of 24 questions

• MCQeasyGeometrical opticslaw of refraction and total internal reflection

  The wavelength of light, while it is passing through water is 540 nm. The refractive index of water is 4/3. The wavelength of the same light when it is passing through a transparent medium having refractive index of 3/2 is _________nm.

  Options

  • Option A

    380

  • Option B

    840

  • Option C

    480

  • Option D

    540

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• MCQmediumThermodynamicskinetic therory of gaseous

  Consider two boxes containing ideal gases A and B such that their temperatures, pressures and number densities are same. The molecular size of A is half of that of B and mass of molecule A is four times that of B. If the collision frequency in gas B is 32 × 10¹⁸/s then collision frequency in gas A is _____/s.

  Options

  • Option A

    32 × 10¹⁸

  • Option B

    4 × 10¹⁸

  • Option C

    2 × 10¹⁸

  • Option D

    8 × 10¹⁸

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  A laser beam has intensity of 4.0 × 10¹⁴ W/m². The amplitude of magnetic field associated with beam is _________ T. (Take ε₀ = 8.85 × 10⁻¹² C²/Nm² and c = 3 × 10⁸ m/s)

  Options

  • Option A

    2.0

  • Option B

    18.3

  • Option C

    5.5

  • Option D

    1.83

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• NumericmediumElectromagnetic Inductionfaradays law and question based on it

  A conducting circular loop is rotated about its diameter at a constant angular speed of 100 rad/s in a magnetic field of 0.5T perpendicular to the axis of rotation. When the loop is rotated by 30° from the horizontal position, the induced EMF is 15.4 mV. The radius of the loop is ______ mm.

  (Take π = 22/7)

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• MCQmediumGravitationSatellites, Orbital Motion & Kepler’s Laws

  Given below are two statements :

  Statement I : A satellite is moving around earth in the orbit very close to the earth surface. The time period of revolution of satellite depends upon the density of earth.

  Statement II : The time period of revolution of the satellite is T = 2π√(Rₑ/g) (for satellite very close to the earth surface), where Rₑ radius of earth and g acceleration due to gravity.

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

  Options

  • Option A

    Both Statement I and Statement II are false

  • Option B

    Both Statement I and Statement II are true

  • Option C

    Statement I is true but Statement II is false

  • Option D

    Statement I is false but Statement II is true

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

  The smallest wavelength of Lyman series is 91 nm. The difference between the largest wavelengths of Paschen and Balmer series is nearly ____ nm.

  Options

  • Option A

    1875

  • Option B

    1550

  • Option C

    1217

  • Option D

    1784

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• MCQmediumWork , Power and Energyconservative force and potential energy

  Given below are two statements :

  Statement I : An object moves from position r₁ to position r₂ under a conservative force field F. The work done by the force is W = -∫ $\vec{F}.\vec{dr}$ from r₁ to r₂.

  Statement II : Any object moving from one location to another location can follow infinite number of paths. Therefore, the amount of work done by the object changes with the path it follows for a conservative force.

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

  Options

  • Option A

    Both Statement I and Statement II are true

  • Option B

    Statement I is false but Statement II is true

  • Option C

    Statement I is true but Statement II is false

  • Option D

    Both Statement I and Statement II are false

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• MCQeasySimple Harmonic Motionangular shm and its time period

  Using a simple pendulum experiment g is determined by measuring its time period T. Which of the following plots represent the correct relation between the pendulum length L and time period T ?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• MCQeasyGeometrical opticsspherical mirror

  In parallax method for the determination of focal length of a concave mirror, the object should always be placed :

  Options

  • Option A

    between the focus (F) and the centre of curvature (C) of the mirror ONLY

  • Option B

    at any point beyond the focus (F) of the mirror

  • Option C

    beyond the centre of the curvature (C) of the mirror ONLY

  • Option D

    between the pole (P) and the focus (F) of the concave mirror ONLY

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• NumericmediumCurrent electricityElectric Current, Drift Velocity & Resistance

  A cylindrical conductor of length 2m and area of cross-section 0.2 mm² carries an electric current of 1.6 A when its ends are connected to a 2V battery. Mobility of electrons in the conductor is α × 10⁻³ m²/V.s. The value of α is :

  (electron concentration = 5 × 10²⁸/m³ and electron charge = 1.6 × 10⁻¹⁹ C)

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