22 January Evening Shift physics questions with solutions

Showing 1–10 of 24 questions

• MCQmediumAtomic Structure and X-raysAtomic Structure & Bohr's 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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• MCQeasyUnits, Dimensions, Measurements and ErrorsSystems of Units and Unit Conversion

  If ε₀, E and t represent the free space permittivity, electric field and time respectively, then the unit of

  ε₀E/t

  will be :

  Options

  • Option A

    A·m

  • Option B

    A·m²

  • Option C

    A/m²

  • Option D

    A/m

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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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• NumericeasyThermodynamicsThermodynamic Processes, P-V Diagrams and Work Done

  An insulated cylinder of volume 60 cm³ is filled with a gas at 27°C and 2 atmospheric pressure. Then the gas is compressed making the final volume as 20 cm³ while allowing the temperature to rise to 77°C. The final pressure is _______ atmospheric pressure.

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• MCQeasyWave MotionStanding Sound Waves, Organ Pipes and Resonance Tubes

  In an open organ pipe ν₃ and ν₆ are 3rd and 6th harmonic frequencies, respectively. If ν₆ - ν₃ = 2200 Hz then length of the pipe is ______ mm.

  (Take velocity of sound in air is 330 m/s.)

  Options

  • Option A

    275

  • Option B

    225

  • Option C

    200

  • Option D

    250

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• NumericeasyCapacitorCapacitor–Battery Connections & Charge Sharing

  A capacitor P with capacitance 10 × 10⁻⁶ F is fully charged with a potential difference of 6.0 V and disconnected from the battery. The charged capacitor P is connected across another capacitor Q with capacitance 20 × 10⁻⁶ F. The charge on capacitor Q when equilibrium is established will be α × 10⁻⁵ C (assume capacitor Q does not have any charge initially), the value of α is _______ .

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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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• NumericmediumRotational MotionPure Rotation About a Fixed Axis

  Two masses m and 2m are connected by a light string going over a pulley (disc) of mass 30m with radius r = 0.1 m. The pulley is mounted in a vertical plane and it is free to rotate about its axis. The 2m mass is released from rest and its speed when it has descended through a height of 3.6 m is _______ m/s. (Assume string does not slip and g = 10 m/s²)

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• MCQmediumThermodynamicsKinetic Theory of Gases and Molecular Properties

  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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• NumericmediumElectromagnetic InductionMagnetic Flux,Faraday's Laws of Electromagnetic Induction and Lenz's Law

  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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