21 January Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumsemiconductorlogic gate

  The given circuit works as :

  

  Options

  • Option A

    AND gate

  • Option B

    NOR gate

  • Option C

    NAND gate

  • Option D

    OR gate

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• MCQmediumUnit dimension and errorDimension and its application

  Consider a modified Bernoulli equation.

  P + A ───── Bt² + ρg(h + Bt) + ½ρV² = constant

  If t has the dimension of time then the dimensions of A and B are _____, _____respectively.

  Options

  • Option A

    [ML⁰T⁻¹] and [M⁰LT]

  • Option B

    [ML⁰T⁻¹] and [M⁰LT⁻¹]

  • Option C

    [ML⁰T⁻²] and [M⁰LT⁻²]

  • Option D

    [ML⁰T⁻²] and [M⁰LT⁻¹]

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• NumericeasyThermodynamicskinetic therory of gaseous

  10 mole of oxygen is heated at constant volume from 30°C to 40°C. The change in the internal energy of the gas is _______ cal. (The molecular specific heat of oxygen at constant pressure, Cₚ = 7 cal.·mol⁻¹·°C⁻¹ and R = 2 cal.·mol⁻¹·°C⁻¹.)

  Your answer

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• NumericmediumGeometrical opticslens and combination lens,silvered lens

  A collimated beam of light of diameter 2 mm is propagating along x-axis. The beam is required to be expanded in a collimated beam of diameter 14 mm using a system of two convex lenses. If first lens has focal length 40 mm, then the focal length of second lens is ______________ mm.

  Your answer

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• MCQmediumCapacitorcapacitor with dielectric

  A parallel plate capacitor has capacitance C, when there is vacuum within the parallel plates.

  A sheet having thickness ( 1 ─── 3 )rd of the separation between the plates and relative permittivity K is introduced between the plates. The new capacitance of the system is :

  Options

  • Option A

    3KC /2K + 1

  • Option B

    CK / 2 + K

  • Option C

    3CK² /(2K + 1)²

  • Option D

    4KC /3K - 1

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• MCQeasyUnit dimension and errorError and its addition ,subtraction,multipication and division

  In an experiment the values of two spring constants were measured as k₁ = (10 ± 0.2) N·m⁻¹ and k₂ = (20 ± 0.3) N·m⁻¹. If these springs are connected in parallel, then the percentage error in equivalent spring constant is :

  Options

  • Option A

    2.67%

  • Option B

    2.33%

  • Option C

    1.33%

  • Option D

    1.67%

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• NumericeasyGeometrical opticsoptical instruments

  In a microscope the objective is having focal length f₀ = 2 cm and eye-piece is having focal length fₑ = 4 cm. The tube length is 32 cm. The magnification produced by this microscope for normal adjustment is ___________.

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  The heat generated in 1 minute between points A and B in the given circuit, when a battery of 9V with internal resistance of 1 Ω is connected across these points is _________ J.

  

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• MCQmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  A light wave described by E = 60[sin(3 × 10¹⁵t) + sin(12 × 10¹⁵t)] (in SI units) falls on a metal surface of work function 2.8 eV. The maximum kinetic energy of ejected photoelectron is (approximately) _________ eV. (h = 6.6 × 10⁻³⁴ J·s. and e = 1.6 × 10⁻¹⁹C)

  Options

  • Option A

    5.1

  • Option B

    3.8

  • Option C

    6.0

  • Option D

    7.8

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The electric field a plane electromagnetic wave is given by :

  E₍y₎ = 69 sin[0.6 × 10³x - 1.8 × 10¹¹t] V·m⁻¹.

  The expression for magnetic field associated with this electromagnetic wave is_____T.

  Options

  • Option A

    B₍z₎ = 2.3 × 10⁻⁷ sin[0.6 × 10³x - 1.8 × 10¹¹t]

  • Option B

    B₍z₎ = 2.3 × 10⁻⁷ sin[0.6 × 10³x + 1.8 × 10¹¹t]

  • Option C

    B₍y₎ = 69 sin[0.6 × 10³x + 1.8 × 10¹¹t]

  • Option D

    B₍y₎ = 2.3 × 10⁻⁷ sin[0.6 × 10³x - 1.8 × 10¹¹t]

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