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Day 287: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 2021 Paper 24 (same type asked 4 times) See all 4 of this type

    19
    Electric field of plane electromagnetic wave propagating through a non-magnetic medium is given by E=20cos⁡(2×1010t−200x)V/mE = 20\cos\left( 2 \times10^{10}t - 200x \right)V/m. The dielectric constant of the medium is equal to: (Take μr=1\mu_{r}= 1 )

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  2. Question 2

    Thermal Properties of Matter. Asked once: 25 Jul 2022 (same type asked 4 times) See all 4 of this type

    113
    A block of ice of mass 120 g120\text{ }g at temperature 0∘C0^{\circ}C is put in 300gm300gm of water at 25∘C25^{\circ}C. The xgxg of ice melts as the temperature of the water reaches 0∘C0^{\circ}C. The value of xx is ____\_\_\_\_. [Use: Specific heat capacity of water =4200= 4200 Jkg−1 K−1Jkg^{- 1}{\text{ }K}^{- 1}, Latent heat of ice =3.5×105Jkg−1= 3.5 \times10^{5}Jkg^{- 1}]

  3. Question 3

    Electrostatics. Asked once: 3 Apr 2025 (same type asked 4 times) See all 4 of this type

    8
    A parallel plate capacitor is filled equally (half) with two dielectrics of dielectric constant ε1\varepsilon_{1} and ε2\varepsilon_{2}, as shown in figures. The distance between the plates is d and area of each plate is A . If capacitance in first configuration and second configuration are C1C_{1} and C2C_{2} respectively, then C1C2\frac{C_{1}}{C_{2}} is:

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  4. Question 4

    Motion in a Plane. Asked once: 27 Jun 2022 (same type asked 4 times) See all 4 of this type

    95
    A stone tied to a string of length LL is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position and has a speed uu. The magnitude of change in its velocity, as it reaches a position where the string is horizontal, is x(u2−gL)\sqrt{x\left( u^{2}- gL \right)}. The value of xx is

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  5. Question 5

    Electromagnetic Waves. Asked once: 1 Feb 2023 (same type asked 4 times) See all 4 of this type

    11
    Match List I with List II:
    List IList II
    (A) Microwaves(I) Radioactive decay of the nucleus
    (B) Gamma rays(II) Rapid acceleration and deceleration of electron in aerials
    (C) Radio waves(III) Inner shell electrons
    (D) X-rays(IV) Klystron valve
    Choose the correct answer from the options given below:

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