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Day 358: JEE Mains Physics

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

  1. Question 1

    Motion in a Plane. Asked once: 2021 Paper 14 (same type asked 4 times) See all 4 of this type

    6
    A particle tied to string of length 0.5 m0.5\text{ }m is given a velocity 3 ms−13{\text{ }ms}^{- 1} at its bottom point while undergoing vertical circular motion. What will be its speed when it makes an angle of 60∘60^{\circ} with the lower vertical?

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  2. Question 2

    Electromagnetic Waves. Asked once: 2021 Paper 2 (same type asked 4 times) See all 4 of this type

    8
    Match List - I with List - II.
    List - IList - II
    (A) Source of microwave frequency(i) Radioactive decay of nucleus
    (B) Source of infrared frequency(ii) Magnetron
    (C) Source of Gamma Rays(iii) Inner shell electrons
    (D) Source of X-rays(iv) Vibration of atoms and molecules
    (v) LASER
    (vi) RC circuit
    Choose the correct answer from the options given below:

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  3. Question 3

    Wave Optics. Asked once: 29 Jan 2023 (same type asked 4 times) See all 4 of this type

    112
    Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium -1 ) and 6.8 (medium -2 ), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be tan⁡−1(1+10θ)12\tan^{- 1}\left( 1 +\frac{10}{\theta} \right)^{\frac{1}{2}} the value of θ\theta is_____ (Given for dielectric media, μr=1\mu_{r}= 1 )

  4. Question 4

    Mechanical Properties of Fluids. Asked once: 2021 Paper 17 (same type asked 4 times) See all 4 of this type

    3
    A raindrop with radius R=0.2 mmR = 0.2\text{ }mm falls from a cloud at a height h=2000 mh = 2000\text{ }m above the ground. Assume that the drop is spherical throughout its fall and the force of buoyance may be neglected, then the terminal speed attained by the raindrop is : [Density of water ρw=1000 kg m−3\rho_{w}= 1000\text{ }kg{\text{ }m}^{- 3} and Density of air ρa=1.2 kg m−3, g=10 m/s2\rho_{a}= 1.2\text{ }kg{\text{ }m}^{- 3},\text{ }g = 10\text{ }m/s^{2} Coefficient of viscosity of air =1.8×10−5Nsm−2= 1.8 \times10^{- 5}Nsm^{- 2} ]

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  5. Question 5

    Waves. Asked once: 6 Apr 2023 (same type asked 4 times) See all 4 of this type

    98
    The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:

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