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Day 166: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 4 Apr 2025 (same type asked 5 times) See all 5 of this type

    19
    Two small spherical balls of mass 10 g each with charges −2μC- 2\mu C and 2μC2\mu C, are attached to two ends of very light rigid rod of length 20 cm . The arrangement is now placed near an infinite nonconducting charge sheet with uniform charge density of 100μC/m2100\mu C/m^{2} such that length of rod makes an angle of 30∘30^{\circ} with electric field generated by charge sheet. Net torque acting on the rod is: (Take ε0\varepsilon_{0} : 8.85×10−12C2/Nm28.85 \times10^{- 12}C^{2}/Nm^{2} )

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  2. Question 2

    Motion in a Straight Line. Asked once: 1 Feb 2024 (same type asked 5 times) See all 5 of this type

    112
    A particle initially at rest starts moving from reference point. x=0x = 0 along xx-axis, with velocity vv that varies as v=4xm/sv = 4\sqrt{x}m/s. The acceleration of the particle is _______ ms−2ms^{- 2}.

  3. Question 3

    Nuclei. Asked once: 29 Jul 2022 (same type asked 5 times) See all 5 of this type

    101
    Read the following statements: (A) Volume of the nucleus is directly proportional to the mass number. (B) Volume of the nucleus is independent of mass number. (C) Density of the nucleus is directly proportional to the mass number. (D) Density of the nucleus is directly proportional to the cube root of the mass number. (E) Density of the nucleus is independent of the mass number. Choose the correct option from the following options.

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  4. Question 4

    Wave Optics. Asked once: 31 Jan 2024 (same type asked 5 times) See all 5 of this type

    26
    Two waves of intensity ratio 1:91:9 cross each other at a point. The resultant intensities at the point, when (a) Waves are incoherent is I1I_{1} (b) Waves are coherent is I2I_{2} and differ in phase by 60∘60^{\circ}. If I1I2=10x\frac{I_{1}}{I_{2}}=\frac{10}{x} then x=x = ______ .

  5. Question 5

    Alternating Current. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    111
    A series LCR circuit consists of R=80Ω,XL=100ΩR = 80\Omega,X_{L}= 100\Omega, and XC=40ΩX_{C}= 40\Omega. The input voltage is 2500 cos⁡(100πt)V\cos(100\pi t)V. The amplitude of current, in the circuit, is____ A.