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Day 447: JEE Mains Physics

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

  1. Question 1

    Wave Optics. Asked once: 28 Jan 2026 S1

    16
    Given below are two statements : Statement-I : A plane wave after passing through prism remains as plane wave but passing through small pin hole may become spherical wave. Statement-II : The curvature of a spherical wave emerging from a slit will increase for increasing slit width. In the light of the above statements, choose the correct answer from the options given below.

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  2. Question 2

    Waves. Asked once: 7 Apr 2025

    88
    The equation of a wave travelling on a string is y=sin⁡[20πx+10πt]y= \sin\lbrack 20\pi x+ 10\pi t\rbrack, where xx and tt are distance and time in SI units. The minimum distance between two points having the same oscillating speed is :

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  3. Question 3

    Work, Energy and Power. Asked once: 23 Jan 2026 S2

    8
    A bead PP sliding on a frictionless semi-circular string ( ACBACB ) and it is at point SS at t=0t = 0 and at this instant the horizontal component of its velocity is vv. Another bead QQ of the same mass as PP is ejected from point AA at t=0t = 0 along the horizontal string ABAB, with the speed vv, friction between the beads and the respective strings may be neglected in both cases. Let tpt_{p} and tQt_{Q} be the respective times taken by beads PP and QQ to reach the point BB, then the relation between tpt_{p} and tQt_{Q} is

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  4. Question 4

    Alternating Current. Asked once: 29 Jan 2025

    1
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Choke coil is simply a coil having a large inductance but a small resistance. Choke coils are used with fluorescent mercury-tube fittings. If household electric power is directly connected to a mercury tube, the tube will be damaged. Reason (R): By using the choke coil, the voltage across the tube is reduced by a factor (R/R2+ω2L2)\left( R/\sqrt{R^{2}+\omega^{2}L^{2}} \right), where ω\omega is frequency of the supply across resistor RR and inductor LL. If the choke coil were not used, the voltage across the resistor would be the same as the applied voltage. In the light of the above statements, choose the most appropriate answer from the options given below:

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  5. Question 5

    Atoms. Asked once: 23 Jan 2026 S1

    13
    In hydrogen atom spectrum, ( R→R \rightarrow Rydberg's constant) (A) the maximum wavelength of the radiation of Lyman series is 43R\frac{4}{3R} (B) the Balmer series lies in the visible region of the spectrum (C) the minimum wavelength of the radiation of Paschen series is 9R\frac{9}{R} (D) the minimum wavelength of Lyman series is 54R\frac{5}{4R} Choose the correct answer from the options given below:

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