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Day 436: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 8 Apr 2026 S2

    1
    A new unit ( α\alpha ) of length is chosen such that it is equal to the speed of light in vacuum. What is the distance between Venus and Earth in terms of α\alpha units if light takes 6 min. 40 s to cover this distance?

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  2. Question 2

    Wave Optics. Asked once: 6 Apr 2026 S1

    22
    An unpolarized light of intensity I0I_{0} passes through polarizer and then through a certain optically active solution and finally it goes to analyser. If the angle between analyser and polariser is 0∘0^{\circ} and intensity of light emerged from analyzer is 38I0\frac{3}{8}I_{0}, the angle of rotation of the light by the solution with respect to analyser is ____\_\_\_\_ degrees.

  3. Question 3

    Waves. Asked once: 22 Jan 2026 S1

    21
    Two loudspeakers (L1L_{1} and L2L_{2}) are placed with a separation of 10 m , as shown in figure. Both speakers are fed with an audio input signal of same frequency with constant volume. A voice recorder, initially at point AA, at equidistance to both loud speakers, is moved by 25 m along the line ABAB while monitoring the audio signal. The measured signal was found to undergo 10 cycles of minima and maxima during the movement. The frequency of the input signal is ____\_\_\_\_ Hz (Speed of sound in air is 324 m/s324\text{ }m/s and 5=2.23\sqrt{5} = 2.23 )

  4. Question 4

    Work, Energy and Power. Asked once: 6 Apr 2026 S2

    19
    The velocity at which 6 kg mass (shown in figure) strikes the ground when it is released from a height of 6 m above the ground is ____\_\_\_\_ m/sm/s. Assume pulley is massless and string is light and inextensible (Take g=10 m/s2g = 10\text{ }m/s^{2} ).

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  5. Question 5

    Alternating Current. Asked once: 28 Jan 2026 S1

    2
    The electric current in the circuit is given as i=io(t/T)i=i_{o}(t/T). The r.m.s current for the period t=0t= 0 to t=Tt=T is ____\_\_\_\_

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