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Day 241: JEE Mains Physics

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

  1. Question 1

    Work, Energy and Power. Asked once: 14 Jun 2022 (same type asked 2 times) See all 2 of this type

    101
    Potential energy as a function of rr is given by U=Ar10−Br5U =\frac{A}{r^{10}}-\frac{B}{r^{5}}, where rr is the interatomic distance, AA and BB are positive constants. The equilibrium distance between the two atoms will be:

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  2. Question 2

    Work, Energy and Power. Asked once: 28 Jun 2022 (same type asked 2 times) See all 2 of this type

    21
    A pendulum is suspended by a string of length 250 cm250\text{ }cm. The mass of the bob of the pendulum is 00 g00\text{ }g. The bob is pulled aside until the string is at 60∘60^{\circ} with vertical as shown in the figure. After releasing the bob. the maximum velocity attained by the bob will be ____\_\_\_\_ ms−1ms^{- 1}. (if g=10 m/s2g = 10\text{ }m/s^{2} )

  3. Question 3

    System of Particles and Rotational Motion. Asked once: 30 Jan 2023 (same type asked 2 times) See all 2 of this type

    109
    A machine gun of mass 10 kg10\text{ }kg fires 20 g20\text{ }g bullets at the rate of 180 bullets per minute with a speed of 100 m s−1100\text{ }m{\text{ }s}^{- 1} each. The recoil velocity of the gun is

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  4. Question 4

    Current Electricity. Asked once: 29 Jun 2022 (same type asked 2 times) See all 2 of this type

    21
    Two coils require 20 minutes and 60 minutes respectively to produce same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce same amount of heat by the combination of coils, will be ____\_\_\_\_ min.

  5. Question 5

    Kinetic Theory. Asked once: 29 Jul 2022 (same type asked 2 times) See all 2 of this type

    109
    The root mean square speed of smoke particles of mass 5×10−17 kg5 \times10^{- 17}\text{ }kg in their Brownian motion in air at NTP is approximately. [Given k=1.38×10−23JK−1k = 1.38 \times10^{- 23}JK^{- 1} ]

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