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Day 262: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 4 Apr 2024 (same type asked 7 times) See all 7 of this type

    6
    The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are 8Ω8\Omega and 10Ω10\Omega respectively. After inserting in a hot bath of temperature 400∘C400^{\circ}C, the resistance of platinum wire is:

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  2. Question 2

    Units and Measurements. Asked once: 27 Jul 2022 (same type asked 7 times) See all 7 of this type

    91
    An expression of energy density is given by u=αβsin⁡(αxkt)u =\frac{\alpha}{\beta}\sin\left( \frac{\alpha x}{kt} \right), where α,β\alpha,\beta are constants, xx is displacement, kk is Boltzmann constant and tt is the temperature. The dimensions of β\beta will be :

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  3. Question 3

    Oscillations. Asked once: 1 Feb 2023 (same type asked 7 times) See all 7 of this type

    25
    The amplitude of a particle executing SHMSHM is 3 cm3\text{ }cm. The displacement at which its kinetic energy will be 25%25\% more than the potential energy is:___ cmcm.

  4. Question 4

    Nuclei. Asked once: 28 Jul 2022 (same type asked 7 times) See all 7 of this type

    22
    A freshly prepared radioactive source of half life 2 hours 30 minutes emits radiation which is 64 times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be________ hours.

  5. Question 5

    Thermodynamics. Asked once: 27 Jun 2022 (same type asked 7 times) See all 7 of this type

    21
    In a carnot engine, the temperature of reservoir is 527∘C527^{\circ}C and that of sink is 200 K200\text{ }K. If the workdone by the engine when it transfers heat from reservoir to sink is 12000 kJ12000\text{ }kJ, the quantity of heat absorbed by the engine from reservoir is ____×106 J\_\_\_\_ \times10^{6}\text{ }J.