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Day 104: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked 2 times: 2021 Paper 5, 28 Jul 2022 See all 2 times it was asked

    99
    A slab of dielectric constant KK has the same crosssectional area as the plates of a parallel plate capacitor and thickness 34 d\frac{3}{4}\text{ }d, where dd is the separation of the plates. The capacitance of the capacitor when the slab is inserted between the plates will be: (Given Co=C_{o}= capacitance of capacitor with air as medium between plates.)

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  2. Question 2

    Units and Measurements. Asked 2 times: 2021 Paper 9*, 28 Jul 2022 (* = numbers or wording changed that year) See all 2 times it was asked

    120
    In an experiment to find acceleration due to gravity (g) using simple pendulum, time period of 0.5 s0.5\text{ }s is measured from time of 100 oscillation with a watch of 1 s1\text{ }s resolution. If measured value of length is 10 cm10\text{ }cm known to 1 mm1\text{ }mm accuracy. The accuracy in the determination of gg is found to be x%x\%. The value of xx is

  3. Question 3

    Work, Energy and Power. Asked 2 times: 25 Jun 2022*, 28 Jul 2022 (* = numbers or wording changed that year) See all 2 times it was asked

    29
    A block of mass ' mm ' (as shown in figure) moving with kinetic energy EE compresses a spring through a distance 25 cm25\text{ }cm when, its speed is halved. The value of spring constant of used spring will be nENm−1nENm^{- 1} for n=n =__________

  4. Question 4

    Gravitation. Asked 2 times: 26 Jul 2022*, 27 Jul 2022 (* = numbers or wording changed that year) See all 2 times it was asked

    96
    A body of mass mm is projected with velocity λve\lambda v_{e} in vertically upward direction from the surface of the earth into space. It is given that vev_{e} is escape velocity and λ<1\lambda < 1. If air resistance is considered to the negligible, then the maximum height from the centre of earth, to which the body can go, will be ( RR : radius of earth)

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  5. Question 5

    Nuclei. Asked 2 times: 29 Jun 2022*, 27 Jul 2022 (* = numbers or wording changed that year) See all 2 times it was asked

    108
    The activity of a radioactive material is 6.4×10−46.4 \times10^{- 4} curie. Its half life is 5 days. The activity will become 5×10−65 \times10^{- 6} curie after:

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