22 January Morning Shift physics questions with solutions

Showing 1–10 of 24 questions

• NumericmediumWave MotionStanding Sound Waves, Organ Pipes and Resonance Tubes

  Two loudspeakers (L₁ and L₂) are placed with a separation of 10 m, as shown in figure. Both speakers are fed with an audio input signal of same frequency with constant volume. A voice recorder, initially at point A, at equidistance to both loud speakers, is moved by 25 m along the line AB while monitoring the audio signal. The measured signal was found to undergo 10 cycles of minima and maxima during the movement. The frequency of the input signal is _____ Hz

  (Speed of sound in air is 324 m/s and √5 = 2.23)

  

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• NumericmediumGeometrical opticsRefraction at Spherical Surfaces

  A parallel beam of light travelling in air (refractive index 1.0) is incident on a convex spherical glass surface of radius of curvature 50 cm. Refractive index of glass is 1.5. The rays converge to a point at a distance x cm from the centre of the curvature of the spherical surface. The value of x is ____ cm.

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• MCQmediumGravitationAcceleration Due to Gravity & Escape Velocity

  The escape velocity from a spherical planet A is 10 km/s. The escape velocity from another planet B whose density and radius are 10% of those of planet A, is______m/s.

  Options

  • Option A

    1000

  • Option B

    200√5

  • Option C

    100√10

  • Option D

    1000√2

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• MCQeasyGeometrical opticsPrisms & Thin Prisms

  Consider an equilateral prism (refractive index √2). A ray of light is incident on its one surface at a certain angle i. If the emergent ray is found to graze along the other surface then the angle of refraction at the incident surface is close to ____.

  Options

  • Option A

    15°

  • Option B

    20°

  • Option C

    40°

  • Option D

    30°

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• MCQeasyElectrostaticElectric Field & Superposition Principle

  A simple pendulum has a bob with mass m and charge q. The pendulum string has negligible mass. When a uniform and horizontal electric field E is applied, the tension in the string changes. The final tension in the string, when pendulum attains an equilibrium position is _____.

  (g : acceleration due to gravity)

  Options

  • Option A

    mg - qE

  • Option B

    mg + qE

  • Option C

    √(m²g² + q²E²)

  • Option D

    √(m²g² - q²E²)

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

  The electric field of a plane electromagnetic wave, travelling in an unknown non-magnetic medium is given by,

  Eᵧ = 20 sin (3 × 10⁶x - 4.5 × 10¹⁴t) V/m

  (where x, t and other values have S.I. units). The dielectric constant of the medium is ____.

  (speed of light in free space is 3 × 10⁸ m/s)

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• MCQeasyKinematics part-2 Projectile MotionMotion in 2-D and ground to ground projectile

  A projectile is thrown upward at an angle 60° with the horizontal. The speed of the projectile is 20 m/s when its direction of motion is 45° with the horizontal. The initial speed of the projectile is_____ m/s.

  Options

  • Option A

    40√2

  • Option B

    40

  • Option C

    20√3

  • Option D

    20√2

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• NumericmediumElectromagnetic InductionSelf-Inductance, Induced EMF and Transient Analysis of L-R Circuits

  Inductance of a coil with 10⁴ turns is 10 mH and it is connected to a dc source of 10 V with internal resistance of 10 Ω. The energy density in the inductor when the current reaches (1/e) of its maximum value is απ × (1/e²) J/m³. The value of α is ___.

  (μ₀ = 4π × 10⁻⁷ Tm/A)

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• MCQmediumElectrostaticElectric Potential & Potential Energy

  Electric field in a region is given by $\vec{E}$ = Axî + Byĵ, where A = 10 V/m² and B = 5 V/m². If the electric potential at a point (10, 20) is 500 V, then the electric potential at origin is ______ V.

  Options

  • Option A

    1000

  • Option B

    500

  • Option C

    2000

  • Option D

    0

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• MCQmediumNuclear physicsNuclear Properties, Mass Defect & Binding Energy

  The minimum frequency of photon required to break a particle of mass 15.348 amu into 4α particles is ____ kHz.

  [mass of He nucleus = 4.002 amu, 1 amu = 1.66 × 10⁻²⁷ kg, h = 6.6 × 10⁻³⁴ J.s and c = 3 × 10⁸ m/s]

  Options

  • Option A

    9 × 10¹⁹

  • Option B

    9 × 10²⁰

  • Option C

    14.94 × 10²⁰

  • Option D

    14.94 × 10¹⁹

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