JEE Mains 2016 physics questions with solutions

Showing 1–10 of 19 questions

• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  A galvanometer having a coil resistance of 100Ω gives a full scale deflection, when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10A, is :-

  Options

  • Option A

    3Ω

  • Option B

    0.01Ω

  • Option C

    2Ω

  • Option D

    0.1Ω

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• MCQmediumRotational Motionangular momentum in pure rotation and its conservation

  A particle of mass m is moving along the side of a square of side 'a', with a uniform speed v in the x-y plane as shown in the figure. Which of the following statement is false for the angular momentum $\vec{L}$ about the origin ?

  

  Options

  • Option A

    $\vec{L}$ = mυ √2 Rk̂ when the particle is moving from D to A

  • Option B

    $\vec{L}$ = -mυ √2 Rk̂ when the particle is moving from A to B

  • Option C

    $\vec{L}$ = mυ[ R √2 -a] k̂ when the particle is moving from C to D

  • Option D

    $\vec{L}$ = mυ[ R √2 + a] k̂ when the particle is moving from B to C

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• MCQmediumThermodynamics

  A pendulum clock loses 12s in a day if the temperature is 40°C and gains 4s in a day if the temperature is 20°C. The temperature at which the clock will show correct time, and the coefficient of linear expansion (α) of the metal of the pendulum shaft are respectively :-

  Options

  • Option A

    55°C ; α = 1.85 ×10⁻² /°C

  • Option B

    25°C ; α = 1.85 ×10⁻⁵ /°C

  • Option C

    60°C ; α = 1.85 ×10⁻⁴ /°C

  • Option D

    30°C ; α = 1.85 ×10⁻³ /°C

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• MCQmediumMagnetic effect of current

  Two identical wires A and B, each of length ℓ, carry the same current I. Wire A is bent into a circle of radius R and wire B into a square of side a. If Bₐ and Bᵦ are the magnetic fields at the centres of the circle and square respectively, find Bₐ/Bᵦ.

  Options

  • Option A

    π²/(8√2)

  • Option B

    π²/8

  • Option C

    π²/(16√2)

  • Option D

    π²/16

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• MCQmediumGeometrical opticsoptical instruments

  An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears:

  Options

  • Option A

    20 times nearer

  • Option B

    10 times taller

  • Option C

    10 times nearer

  • Option D

    20 times taller

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• MCQmediumSimple Harmonic Motion

  A particle performs simple harmonic motion with amplitude A. Its speed is trippled at the instant that it is at distance 2A/3 from equilibrium position. The new amplitude of the motion is.

  Options

  • Option A

    3A

  • Option B

    √3 A

  • Option C

    7A/3

  • Option D

    A√41/3

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• MCQmediumNewtons law of motion and Frictionfriction and single block problem

  A rocket accelerates vertically upward at 2g. Inside it, a mass m rests on an incline at angle θ with the horizontal. The minimum coefficient of friction required so that the mass does not move relative to the incline is:

  Options

  • Option A

    2 tanθ

  • Option B

    3 tanθ

  • Option C

    tanθ

  • Option D

    tan2θ

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• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  In the circuit shown, the resistance r is a variable resistance. If for r = f R, the heat generation in r is maximum then the value of f is :

  

  Options

  • Option A

    1

  • Option B

    1/4

  • Option C

    1/2

  • Option D

    $\frac{3}{4}$

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• MCQmediumWave Optics

  A pinhole camera has length L and the pinhole has radius a. The spot on the opposite wall is assumed to have a spread equal to the sum of its geometrical spread and its diffraction spread. For incident wavelength λ, the spot has minimum size bₘᵢₙ when:

  Options

  • Option A

    a=λ²/L and bₘᵢₙ=√(4λL)

  • Option B

    a=λ²/L and bₘᵢₙ=2λ²/L

  • Option C

    a=√(λL) and bₘᵢₙ=2λ²/L

  • Option D

    a=√(λL) and bₘᵢₙ=√(4λL)

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• MCQmediumUnit dimension and error

  A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be:

  Options

  • Option A

    92 ± 3 s

  • Option B

    92 ± 2 s

  • Option C

    92 ± 5.0 s

  • Option D

    92 ± 1.8 s

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