28 January Evening Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumNewtons law of motion and FrictionPseudo Force & Non-Inertial Frames

  A small block of mass m slides down from the top of a frictionless inclined surface, while the inclined plane is moving towards left with constant acceleration a₀. The angle between the inclined plane and ground is θ and its base length is L. Assuming that initially the small block is at the top of the inclined plane, the time it takes to reach the lowest point of the inclined plane is ________.

  

  Options

  • Option A

    √[2L/{g sin(2θ) - a₀(1 + cos(2θ))}]

  • Option B

    √[4L/{g sin(2θ) - a₀(1 + cos(2θ))}]

  • Option C

    √[4L/{g cos²θ - a₀ sinθ cosθ}]

  • Option D

    √[2L/{g sinθ - a₀ cosθ}]

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• NumericmediumAC CircuitsSeries AC Circuits: Impedance, Phase Difference, Resonance and Power Factor

  An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy due to its resistance when an a.c. current of 2 A (rms) and frequency 50 Hz flows through it. The ratio of inductive reactance to its resistance is ________.

  (π = 3.14)

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• IntegereasyWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Two tuning forks A and B are sounded together giving rise to 8 beats in 2 s. When fork A is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork B is 380 Hz, then the original frequency of tuning fork A is ______ Hz.

  Your answer

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index n of the prism satisfies.

  Options

  • Option A

    √2 < n < 2√2

  • Option B

    1 < n < 2

  • Option C

    n ≥ 2

  • Option D

    √2 < n < 2

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• MCQeasyNuclear physicsNuclear Properties, Mass Defect & Binding Energy

  A nucleus has mass number α and radius $R_{\alpha}$. Another nucleus has mass number β and radius $R_{\beta}$. If β = 8α, then $\frac{R_{\alpha}}{R_{\beta}}$ is :

  Options

  • Option A

    2

  • Option B

    8

  • Option C

    1

  • Option D

    0.5

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• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  A plane electromagnetic wave is moving in free space with velocity c = 3 × 10⁸ m/s and its electric field is given as

  $\vec{E}$ = 54 sin(kz - ωt) ĵ V/m,

  where ĵ is the unit vector along y-axis. The magnetic field vector $\vec{B}$ of the wave is :

  Options

  • Option A

    -1.8 × 10⁻⁷ sin(kz - ωt) î T

  • Option B

    +1.4 × 10⁻⁷ sin(kz - ωt) k̂ T

  • Option C

    +1.4 × 10⁻⁷ sin(kz - ωt) î T

  • Option D

    +1.8 × 10⁻⁷ sin(kz - ωt) î T

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• MCQmediumSimple Harmonic MotionTime Period of Linear Simple Harmonic Motion

  As shown in the figure, a spring is kept in a stretched position with some extension by holding the masses 1 kg and 0.2 kg with a separation more than spring natural length and are released. Assuming the horizontal surface to be frictionless, the angular frequency (in SI unit) of the system is :

  

  Options

  • Option A

    30

  • Option B

    27

  • Option C

    20

  • Option D

    5

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• NumericmediumWave OpticsYoung's Double-Slit Experiment (YDSE)

  A beam of light consisting of wavelengths 650 nm and 550 nm illuminates the Young’s double slits with separation of 2 mm such that the interference fringes are formed on a screen, placed at a distance of 1.2 m from the slits. The least distance of a point from the central maximum, where the bright fringes due to both the wavelengths coincide, is ______ × 10⁻⁵ m.

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• MCQmediumKinematics Part-1 (one dimension)Acceleration and Avg acceleration

  A particle starts moving from time t = 0 and its coordinate is given as

  x(t) = 4t³ - 3t.

  A. The particle returns to its original position (origin) 0.866 units later.

  B. The particle is 1 unit away from origin at its turning point.

  C. Acceleration of the particle is non-negative.

  D. The particle is 0.5 units away from origin at its turning point.

  E. Particle never turns back as acceleration is non-negative.

  Choose the correct answer from the options given below :

  Options

  • Option A

    A, C, D only

  • Option B

    A, B, C only

  • Option C

    C, E only

  • Option D

    A, C only

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• MCQeasysemiconductorDiode Applications & Zener Breakdown

  Two p-n junction diodes D₁ and D₂ are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a ____.

  

  Options

  • Option A

    OR Gate

  • Option B

    NOR Gate

  • Option C

    NAND Gate

  • Option D

    AND Gate

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