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Day 143: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 3 Apr 2025 (same type asked 10 times) See all 10 of this type

    100
    A physical quantity C is related to four other quantities p,q,rp,q,r and s as follows C=pq2r3 sC = \frac{{pq}^{2}}{r^{3}\sqrt{\text{ }s}}.The percentage errors in the measurement of p, q, r and ss are 1%,2%,3%1\%, 2\%, 3\% and 2%2\% respectively. The percentage error in the measurement of CC will be ____ %\_\_\_\_\ \%.

  2. Question 2

    Alternating Current. Asked once: 23 Jan 2026 S1 (same type asked 10 times) See all 10 of this type

    23
    Using a variable-frequency a.c. voltage source, the maximum current measured in the given LCR circuit is 50 mA for V=5sin⁡(100t)V = 5\sin(100t). The values of L and R are shown in the figure. The capacitance of the capacitor ( C ) used is ____\_\_\_\_ μF\mu F.

  3. Question 3

    Mechanical Properties of Fluids. Asked once: 2 Apr 2026 S1 (same type asked 10 times) See all 10 of this type

    20
    A liquid drop of diameter 2 mm breaks into 512 droplets. The change in surface energy is α×10−6 J\alpha \times10^{- 6}\text{ }J. The value of α\alpha is ____\_\_\_\_ . (Take surface tension of liquid =0.08 N/m= 0.08\text{ }N/m )

    Tap an option to check your answer.

  4. Question 4

    Electromagnetic Waves. Asked once: 28 Jan 2026 S2 (same type asked 10 times) See all 10 of this type

    2
    A plane electromagnetic wave is moving in free space with velocity c=3×108 m/sc = 3 \times10^{8}\text{ }m/s and its electric field is given as E→=54sin⁡(kz−ωt)j^V/m\overrightarrow{E}= 54\sin(kz -\omega t)\widehat{j}V/m, where j^\widehat{j} is the unit vector along yy-axis. The magnetic field vector B→\overrightarrow{B} of the wave is :

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  5. Question 5

    Wave Optics. Asked once: 2 Apr 2026 S1 (same type asked 10 times) See all 10 of this type

    21
    In single slit diffraction pattern, the wavelength of light used is 628 nm and slit width is 0.2 mm , the angular width of central maximum is α×10−2\alpha \times 10^{- 2} degrees. The value of α\alpha is ____\_\_\_\_ .