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Day 328: JEE Mains Physics

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

  1. Question 1

    Waves. Asked once: 23 Jan 2025 (same type asked 9 times) See all 9 of this type

    79
    The equation of a transverse wave travelling along a string is y(x,t)=4.0sin⁡[20×10−3x+600t]mmy(x,t) = 4.0\sin\left\lbrack 20 \times10^{- 3}x + 600t \right\rbrack mm, where x is in the mm and t is in second. The velocity of the wave is :

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  2. Question 2

    Ray Optics. Asked once: 24 Jan 2025 (same type asked 9 times) See all 9 of this type

    15
    A plano-convex lens having radius of curvature of first surface 2 cm exhibits focal length of f1f_{1} in air. Another plano-convex lens with first surface radius of curvature 3 cm has focal length of f2f_{2} when it is immersed in a liquid of refractive index 1.2. If both the lenses are made of same glass of refractive index 1.5 , the ratio of f1f_{1} and f2f_{2} will be :-

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  3. Question 3

    Electrostatics. Asked once: 10 Apr 2023 (same type asked 9 times) See all 9 of this type

    96
    The distance between two plates of a capacitor is dd and its capacitance is C1C_{1}, when air is the medium between the plates. If a metal sheet of thickness 2 d3\frac{2\text{ }d}{3} and of same area as plate is introduced between the plates, the capacitance of the capacitor becomes C2C_{2}. The ratio C2C1\frac{C_{2}}{C_{1}} is:

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  4. Question 4

    Kinetic Theory. Asked once: 1 Feb 2024 (same type asked 9 times) See all 9 of this type

    103
    If the root mean square velocity of hydrogen molecule at a given temperature and pressure is 2 km/s2\text{ }km/s, the root mean square velocity of oxygen at the same condition in km/skm/s is :

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  5. Question 5

    Kinetic Theory. Asked once: 25 Jan 2023 (same type asked 9 times) See all 9 of this type

    91
    According to law of equipartition of energy the molar specific heat of a diatomic gas at constant volume where the molecule has one additional vibrational mode is: -

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