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Day 205: JEE Mains Physics

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

  1. Question 1

    Oscillations. Asked once: 22 Jan 2025 (same type asked 3 times) See all 3 of this type

    86
    Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A simple pendulum is taken to a planet of mass and radius, 4 times and 2 times, respectively, than, the Earth. The time period of the pendulum remains same on earth and the planet. Reason (R) : The mass of the pendulum remains unchanged at Earth and the other planet. In the light of the above statements, choose the correct answer from the options given below :

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  2. Question 2

    Oscillations. Asked once: 14 Jun 2022 (same type asked 3 times) See all 3 of this type

    96
    Two massless springs with spring constants 2k2k and 9k9k, carry 50 g50\text{ }g and 100 g100\text{ }g masses at their free ends. These two masses oscillate vertically such that their maximum velocities are equal. Then, the ratio of their respective amplitudes will be:

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  3. Question 3

    Electrostatics. Asked once: 23 Jan 2025 (same type asked 3 times) See all 3 of this type

    86
    Two point charges −4μc- 4\mu c and 4μc4\mu c, constituting an electric dipole, are placed at (−9,0,0)cm( - 9,0,0)cm and (9,0,0)cm(9,0,0)cm in a uniform electric field of strength 104NC−110^{4}NC^{- 1}. The work done on the dipole in rotating it from the equilibrium through 180∘180^{\circ} is :

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  4. Question 4

    System of Particles and Rotational Motion. Asked once: 25 Jun 2022 (same type asked 3 times) See all 3 of this type

    114
    Moment of Inertia (M.I.) of four bodies having same mass ' MM ' and radius ' 2R2R ' are as follows: I1=I_{1}= M.I. of solid sphere about its diameter I2=I_{2}= M.I. of solid cylinder about its axis I3=I_{3}= M.I. of solid circular disc about its diameter I4=I_{4}= M.I. of thin circular ring about its diameter If 2(I2+I3)+I4=x2\left( I_{2}+I_{3} \right)+I_{4}=x. I1I_{1} then the value of xx will be

  5. Question 5

    Thermodynamics. Asked once: 27 Jul 2022 (same type asked 3 times) See all 3 of this type

    98
    In 1st 1^{\text{st~}} case, Carnot engine operates between temperatures 300 K300\text{ }K and 100 K100\text{ }K. In 2nd 2^{\text{nd~}} case, as shown in the figure, a combination of two engines is used. The efficiency of this combination (in 2nd 2^{\text{nd~}} case) will be:

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