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Day 145: JEE Mains Physics

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

  1. Question 1

    Kinetic Theory. Asked once: 28 Jan 2025 (same type asked 9 times) See all 9 of this type

    79
    The ratio of vapour densities of two gases at the same temperature is 425\frac{4}{25}, then the ratio of r.m.s. velocities will be :

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  2. Question 2

    Kinetic Theory. Asked once: 2 Apr 2025 (same type asked 9 times) See all 9 of this type

    24
    γA\gamma_{A} is the specific heat ratio of monoatomic gas A having 3 translational degrees of freedom. γB\gamma_{B} is the specific heat ratio of polyatomic gas BB having 3 translational, 3 rotational degrees of freedom and 1 vibrational mode. If γAγB=(1+1n)\frac{\gamma_{A}}{\gamma_{B}} = \left( 1 + \frac{1}{n} \right), then the value of nn is .

  3. Question 3

    Current Electricity. Asked once: 4 Apr 2024 (same type asked 9 times) See all 9 of this type

    118
    Two wires AA and BB are made up of the same material and have the same mass. Wire A has radius of 2.0 mm2.0\text{ }mm and wire BB has radius of 4.0 mm4.0\text{ }mm. The resistance of wire BB is 2Ω2\Omega. The resistance of wire AA is ___ Ω\Omega.

  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 24 Jan 2026 S2 (same type asked 8 times) See all 8 of this type

    8
    When a light of a given wavelength falls on a metallic surface the stopping potential for photoelectrons is 3.2 V. If a second light having wavelength twice of first light is used, the stopping potential drops to 0.7 V. The wavelength of first light is ____\_\_\_\_ m. (h=6.63×10−34 J.s,e=1.6×10−19C,c=3×108 m/sh = 6.63 \times10^{- 34}\text{ }J.s,e = 1.6 \times10^{- 19}C,c = 3 \times10^{8}\text{ }m/s )

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  5. Question 5

    Wave Optics. Asked once: 6 Apr 2026 S1 (same type asked 8 times) See all 8 of this type

    11
    In interference experiment the path difference between two interfering waves at a point A on the screen is λ/3\lambda/3, where λ\lambda is the wavelength of these waves, and at another point B the path difference is λ/6\lambda/6. The ratio of intensities at points A and B is ____\_\_\_\_.

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