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Day 485: JEE Mains Physics

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

  1. Question 1

    Waves. Asked once: 25 Jan 2023

    27
    The distance between two consecutive points with phase difference of 60∘60^{\circ} in a wave of frequency 500 Hz500\text{ }Hz is 6.0 m6.0\text{ }m. The velocity with which wave is traveling is___ kms\frac{km}{s}

  2. Question 2

    Work, Energy and Power. Asked once: 28 Jan 2025

    10
    A bead of mass ' mm ' slides without friction on the wall of a vertical circular hoop of radius ' RR ' as shown in figure. The bead moves under the combined action of gravity and a massless spring (k) attached to the bottom of the hoop. The equilibrium length of the spring is ' RR '. If the bead is released from top of the hoop with (negligible) zero initial speed, velocity of bead, when the length of spring becomes ' RR ', would be (spring constant is ' k ', g is acceleration due to gravity)

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  3. Question 3

    Alternating Current. Asked once: 1 Feb 2023

    29
    A series LCR circuit is connected to an ac source of 220 V,50 Hz220\text{ }V,50\text{ }Hz. The circuit contain a resistance R=100ΩR = 100\Omega and an inductor of inductive reactance XL=79.6ΩX_{L}= 79.6\Omega. The capacitance of the capacitor needed to maximize the average rate at which energy is supplied will be___ μF\mu F.

  4. Question 4

    Atoms. Asked once: 15 Apr 2023

    24
    As per given figure A,BA,B and CC are the first, second and third excited energy level of hydrogen atom respectively. If the ratio of the two wavelengths ( i.e.  λ1λ2)\left. \ \frac{\lambda_{1}}{\lambda_{2}} \right) is 74n\frac{7}{4n}, then the value of nn will be

  5. Question 5

    Current Electricity. Asked once: 24 Jan 2026 S2

    4
    A regular hexagon is formed by six wires each of resistance rΩr\Omega and the corners are joined to centre by wires of same resistance. If the current enters at one corner and leaves at the opposite corner, the equivalent resistance of the hexagon between the two opposite corners will be

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