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Day 280: JEE Mains Physics

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

  1. Question 1

    Laws of Motion. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    107
    A block of mass MM placed inside a box descends vertically with acceleration ' aa '. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of ' aa ' will be:

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  2. Question 2

    Work, Energy and Power. Asked once: 25 Jul 2022 (same type asked 5 times) See all 5 of this type

    94
    Two billiard balls of mass 0.05 kg0.05\text{ }kg each moving in opposite directions with 10 ms−110{\text{ }ms}^{- 1} collide and rebound with the same speed. If the time duration of contact is =0.005 s= 0.005\text{ }s, then what is the force exerted on the ball due to each other?

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  3. Question 3

    Semiconductor Electronics. Asked once: 29 Jun 2022 (same type asked 5 times) See all 5 of this type

    28
    A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100μA100\mu A, it brings a change of 10 mA10\text{ }mA in collector current. If the load resistance is 2kΩ2k\Omega and input resistance is 1kΩ1k\Omega, the value of power gain is x×104x \times10^{4}. The value of xx is

  4. Question 4

    Waves. Asked once: 25 Jan 2023 (same type asked 5 times) See all 5 of this type

    114
    A train blowing a whistle of frequency 320 Hz320\text{ }Hz approaches an observer standing on the platform at a speed of 66 m/s66\text{ }m/s. The frequency observed by the observer will be ____\_\_\_\_ Hz (given speed of sound =330 ms−1= 330{\text{ }ms}^{- 1})

  5. Question 5

    Alternating Current. Asked once: 28 Jul 2022 (same type asked 5 times) See all 5 of this type

    24
    The frequencies at which the current amplitude in an LCR series circuit becomes 12\frac{1}{\sqrt{2}} times its maximum value, are 212rads−1212rads^{- 1} and 232rads−1232rads^{- 1}. The value of resistance in the circuit is R=5ΩR = 5\Omega. The self- inductance in the circuit is ____\_\_\_\_ mHmH.