PYQ Vault

Day 107: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Work, Energy and Power. Asked 2 times: 2021 Paper 22*, 2021 Paper 23 (* = numbers or wording changed that year) See all 2 times it was asked

    16
    A block moving horizontally on a smooth surface with a speed of 40 m/s40\text{ }m/s splits into two parts with masses in the ratio of 1:2. If the smaller part moves at 60 m/s60\text{ }m/s in the same direction, then the fractional change in kinetic energy is:

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  2. Question 2

    Thermodynamics. Asked 2 times: 2021 Paper 15*, 2021 Paper 22 (* = numbers or wording changed that year) See all 2 times it was asked

    4
    A reversible engine has an efficiency of 14\frac{1}{4}. If the temperature of the sink is reduced by 58∘C58^{\circ}C, its efficiency becomes double. Calculate the temperature of the sink:

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  3. Question 3

    Semiconductor Electronics. Asked 2 times: 2021 Paper 10, 2021 Paper 21 See all 2 times it was asked

    3
    For a transistor α\alpha and β\beta are given as α=ICIE\alpha=\frac{I_{C}}{I_{E}} and β=ICIB\beta=\frac{I_{C}}{I_{B}}. Then the correct relation between α\alpha and β\beta will be:

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  4. Question 4

    Current Electricity. Asked 2 times: 2021 Paper 14*, 2021 Paper 19 (* = numbers or wording changed that year) See all 2 times it was asked

    15
    An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V200\text{ }V supply. Calculate the resistance RR to be connected in series with the bulb so that the power delivered by the bulb is 500 W500\text{ }W.

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  5. Question 5

    Wave Optics. Asked 2 times: 2021 Paper 2, 2021 Paper 16 See all 2 times it was asked

    13
    In a YDSE setup, orange light is replaced by blue light. Then,

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