23 January Evening Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumWork , Power and Energykinetic enegy and work engery theorem

  A block is sliding down on an inclined plane of slope θ and at an instant t = 0 this block is given an upward momentum so that it starts moving up on the inclined surface with velocity u. The distance (S) travelled by the block before its velocity become zero, is______.

  (g = gravitational acceleration)

  Options

  • Option A

    u²/(4g sinθ)

  • Option B

    2u²/(g cosθ)

  • Option C

    u²/(√2 g cosθ)

  • Option D

    u²/(2g cosθ)

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• MCQmediumAc Cirucuitsavg value and rms value of ac

  Suppose a long solenoid of 100 cm length, radius 2 cm having 500 turns per unit length, carries a current I = 10 sin (ωt) A, where ω = 1000 rad./s. A circular conducting loop (B) of radius 1 cm coaxially slided through the solenoid at a speed v = 1 cm/s. The r.m.s. current through the loop when the coil B is inserted 10 cm inside the solenoid is α/√2 μA. The value of α is _________.

  [Resistance of the loop = 10 Ω]

  Options

  • Option A

    197

  • Option B

    80

  • Option C

    280

  • Option D

    100

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• MCQeasyWave Opticspolarisation

  When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is _______.

  (tan⁻¹ (1.52) = 57.7°, refractive indices of air and glass are 1.00 and 1.52, respectively)

  Options

  • Option A

    39.6°

  • Option B

    32.3°

  • Option C

    42.6°

  • Option D

    36.3°

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• MCQmediumThermodyanmicsfirst law of thermodynamics

  One mole of an ideal diatomic gas expands from volume V to 2V isothermally at a temperature 27°C and does W joule of work. If the gas undergoes same magnitude of expansion adiabatically from 27°C doing the same amount of work W, then its final temperature will be (close to) __________ °C.

  Options

  • Option A

    -189

  • Option B

    -56

  • Option C

    -30

  • Option D

    -117

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• MCQmediumKinematics Part-1 (one dimension)Motion under constant acceleration

  A paratrooper jumps from an aeroplane and opens a parachute after 2 s of free fall and starts deaccelerating with 3 m/s². At 10 m height from ground, while descending with the help of parachute, the speed of paratrooper is 5 m/s. The initial height of the aeroplane is _____m.

  (g = 10 m/s²)

  Options

  • Option A

    62.5

  • Option B

    92.5

  • Option C

    20

  • Option D

    82.5

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• MCQmediumElectrostaticselectric dipole and dipole moment

  Two shorts dipoles (A, B), A having charges ± 2μC and length 1 cm and B having charges ± 4μC and length 1 cm are placed with their centres 80 cm apart as shown in the figure. The electric field at a point P, equi-distant from the centres of both dipoles is_____N/C.

  

  Options

  • Option A

    (9/16)√2 × 10⁵

  • Option B

    4.5√2 × 10⁴

  • Option C

    9√2 × 10⁴

  • Option D

    (9/16)√2 × 10⁴

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

  Which of the following pair of nuclei are isobars of the element ?

  Options

  • Option A

    ²₁H and ³₁H

  • Option B

    ²³⁶₉₂U and ²³⁸₉₂U

  • Option C

    ¹⁹⁸₈₀Hg and ¹⁹⁷₇₉Au

  • Option D

    ³₁H and ³₂He

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• MCQmediumKinematics Part-1 (one dimension)Motion under gravity

  A bead P sliding on a frictionless semi-circular string (ACB) and it is at point S at t = 0 and at this instant the horizontal component of its velocity is v. Another bead Q of the same mass as P is ejected from point A at t = 0 along the horizontal string AB, with the speed v, friction between the beads and the respective strings may be neglected in both cases. Let $t_{P}$ and $t_{Q}$ be the respective times taken by beads P and Q to reach the point B, then the relation between $t_{P}$ and $t_{Q}$ is

  

  Options

  • Option A

    tP > tQ

  • Option B

    tP < tQ

  • Option C

    tP > 1.25tQ

  • Option D

    tP = tQ

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• NumericmediumUnit dimension and errorDimension and its application

  A ball of radius r and density ρ dropped through a viscous liquid of density σ and viscosity η attains its terminal velocity at time t, given by t = Aρᵃrᵇηᶜσᵈ, where A is a constant and a, b c and d are integers. The value of (b + c)/(a + d) is ______.

  Your answer

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• NumericeasyWave Motionsound wave and its general equation and velocity

  The velocity of sound in air is doubled when the temperature is raised from 0°C to α°C. The value of α is _______.

  Your answer

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