23 January Evening Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumElectrostaticElectric Dipole & 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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• NumericmediumGeometrical opticsLenses, Lens Combinations & Silvered Lenses

  The size of the images of an object, formed by a thin lens are equal when the object is placed at two different positions 8 cm and 24 cm from the lens. The focal length of the lens is ________ cm.

  Your answer

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• MCQmediumsemiconductorLogic Gates & Boolean Operations

  For the given logic gate circuit, which of the following is the correct truth table?

  

  Options

  • Option A

    n m z

    0 0 1

    0 1 0

    1 1 0

    1 0 0

  • Option B

    n m z

    0 0 0

    0 1 1

    1 1 0

    1 0 1

  • Option C

    n m z

    0 0 1

    0 1 0

    1 1 1

    1 0 0

  • Option D

    n m z

    0 0 1

    0 1 1

    1 1 0

    1 0 0

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• NumericmediumUnits, Dimensions, Measurements and ErrorsDimensional Analysis and Its Applications

  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 ______.

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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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• NumericmediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  Suppose there is a uniform circular disc of mass M kg and radius r m shown in figure. The shaded regions are cut out from the disc. The moment of inertia of the remainder about the axis A of the disc is given by xMr²/256. The value of x is _________.

  

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy 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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• MCQeasyNuclear physicsNuclear Properties, Mass Defect & Binding Energy

  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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• MCQeasyWave OpticsPolarisation of Light

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

  A circular loop of radius 7 cm is placed in uniform magnetic field of 0.2 T directed perpendicular to plane of loop. The loop is converted into a square loop in 0.5 s. The EMF induced in the loop is ___________ mV.

  Options

  • Option A

    6.6

  • Option B

    13.2

  • Option C

    8.25

  • Option D

    1.32

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