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Day 180: JEE Mains Physics

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

  1. Question 1

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

    1
    The mean free path and the average speed of oxygen molecules at 300 K and 1 atm are 3×10−7 m3 \times10^{- 7}\text{ }m and 600 m/s600\text{ }m/s, respectively. Find the frequency of its collisions.

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  2. Question 2

    Gravitation. Asked once: 31 Jan 2024 (same type asked 4 times) See all 4 of this type

    7
    Four identical particles of mass mm are kept at the four corners of a square. If the gravitational force exerted on one of the masses by the other masses is (22+132)Gm2 L2\left( \frac{2\sqrt{2}+ 1}{32} \right)\frac{Gm^{2}}{{\text{ }L}^{2}}, the length of the sides of the square is

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  3. Question 3

    Motion in a Plane. Asked once: 11 Apr 2023 (same type asked 4 times) See all 4 of this type

    99
    A projectile is projected at 30∘30^{\circ} from horizontal with initial velocity 40 ms−140{\text{ }ms}^{- 1}. The velocity of the projectile at t=2 st = 2\text{ }s from the start will be: (Given g=10 m/s2g = 10\text{ }m/s^{2} )

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  4. Question 4

    Thermodynamics. Asked once: 29 Jul 2022 (same type asked 4 times) See all 4 of this type

    23
    The pressure P1P_{1} and density d1d_{1} of diatomic gas (γ=75)\left( \gamma =\frac{7}{5} \right) changes suddenly to P2(>P1)P_{2}\left( >P_{1} \right) and d2d_{2} respectively during an adiabatic process. The temperature of the gas increases and becomes ____\_\_\_\_ times of its initial temperature. (given d2 d1=32\frac{d_{2}}{{\text{ }d}_{1}}= 32 )

  5. Question 5

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

    17
    A person measures mass of 3 different particles as 435.42 g,226.3 g435.42\text{ }g,226.3\text{ }g and 0.125 g . According to the rules for arithmetic operations with significant figures, the additions of the masses of 3 particles will be.

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