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Day 37: JEE Mains Physics

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

  1. Question 1

    Thermodynamics. This type asked 4 times: 2021 Paper 11, 27 Jan 2024, 21 Jan 2026 S1, 2 Apr 2026 S2. This one: 2 Apr 2026 S2 See all 4 of this type

    23
    5 moles of unknown gas is heated at constant volume from 10∘C10^{\circ}C to 20∘C20^{\circ}C. The molar specific heat of this gas at constant pressure cp=8cal/mol. ∘Cc_{p} = 8cal/mol.\ ^{\circ}C and R=8.36 J/mol. ∘CR = 8.36\text{ }J/mol.\ ^{\circ}C. The change in the internal energy of the gas is ____\_\_\_\_ calorie.

  2. Question 2

    Electromagnetic Waves. This type asked 4 times: 2021 Paper 19, 2021 Paper 23, 27 Jul 2022, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    18
    An electromagnetic wave travelling in x -direction is described by field equation Ey=300sin⁡ω(t−xc)E_{y}= 300\sin\omega\left( t -\frac{x}{c} \right). If the electron is restricted to move in y -direction only with speed of 1.5×106 m/s1.5 \times10^{6}\text{ }m/s then ratio of maximum electric and magnetic forces acting on the electron is ____\_\_\_\_ .

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  3. Question 3

    Electrostatics. This type asked 4 times: 26 Jul 2022, 30 Jan 2023, 8 Apr 2024, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    9
    Two charged conducting spheres S1S_{1} and S2S_{2} of radii 8 cm and 18 cm are connected to each other by a wire. After equilibrium is established, the ratio of electric fields on S1S_{1} and S2S_{2} spheres are ES1E_{S1} and ES2E_{S2} respectively. The value of ES1ES2\frac{E_{S1}}{E_{S2}} is ____\_\_\_\_ .

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  4. Question 4

    Mechanical Properties of Fluids. This type asked 4 times: 8 Apr 2024, 28 Jan 2025, 24 Jan 2026 S2, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    25
    A tube is filled with water and a wooden cube 10 cm×10 cm×10 cm10\text{ }cm \times 10\text{ }cm \times 10\text{ }cm is placed in the water. The wooden cube is found to float on the water with a part of it submerged in water. When a metal coin is placed on the wooden cube, the submerged part is increased by 3.87 cm . The mass of the metal coin is ____\_\_\_\_ gram. (Take water density as 1 g/cm31\text{ }g/{cm}^{3} and density of wood as 0.4 g/cm30.4\text{ }g/{cm}^{3} )

  5. Question 5

    Units and Measurements. This type asked 4 times: 2021 Paper 24, 26 Jul 2022, 8 Apr 2024, 2 Apr 2026 S1. This one: 2 Apr 2026 S1 See all 4 of this type

    2
    The diameter of a wire measured by a screw gauge of least count 0.001 cm is 0.08 cm . The length measured by a scale of least count 0.1 cm is 150 cm . When a weight of 100 N is applied to the wire, the extension in length is 0.5 cm , measured by a micrometer of least count 0.001 cm . The error in the measured Young's modulus is α×109 N/m2\alpha \times10^{9}\text{ }N/m^{2}. The value of α\alpha is ____\_\_\_\_.(Ignore the contribution of the load to Young's modulus error calculation)

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