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Day 370: JEE Mains Physics

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

  1. Question 1

    System of Particles and Rotational Motion. Asked once: 2021 Paper 21 (same type asked 3 times) See all 3 of this type

    5
    Two discs have moments of inertia I1I_{1} and I2I_{2} about their respective axes perpendicular to the plane and passing through the centre. They are rotating with angular speeds, ω1\omega_{1} and ω2\omega_{2} respectively and are brought into contact face to face with their axes of rotation coaxial. The loss in kinetic energy of the system in the process is given by:

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  2. Question 2

    Units and Measurements. Asked once: 7 Apr 2025 (same type asked 20 times) See all 20 of this type

    87
    Match List-I with List-II.
    List-IList-II
    (A) Mass density(I) [ML2T−3]\left\lbrack ML^{2}T^{-3} \right\rbrack
    (B) Impulse(II) [MLT−1]\left\lbrack MLT^{-1} \right\rbrack
    (C) Power(III) [ML2T0]\left\lbrack ML^{2}T^{0} \right\rbrack
    (D) Moment of inertia(IV) [ML−3T0]\left\lbrack ML^{-3}T^{0} \right\rbrack
    Choose the correct answer from the options given below :

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  3. Question 3

    Gravitation. Asked once: 29 Jan 2024 (same type asked 14 times) See all 14 of this type

    104
    A planet takes 200 days to complete one revolution around the Sun. If the distance of the planet from Sun is reduced to one fourth of the original distance, how many days will it take to complete one revolution?

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  4. Question 4

    Electrostatics. Asked once: 1 Feb 2024 (same type asked 12 times) See all 12 of this type

    5
    Two identical capacitors have same capacitance CC. One of them is charged to the potential VV and other to the potential 2 V2\text{ }V. The negative ends of both are connected together. When the positive ends are also joined together, the decrease in energy of the combined system is:

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  5. Question 5

    Ray Optics. Asked once: 2 Apr 2025 (same type asked 12 times) See all 12 of this type

    98
    A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to 60∘60^{\circ}. The refractive index of the prism material is 2\sqrt{2}. The angle of incidence (in degrees) is ____\_\_\_\_.