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Day 40: JEE Mains Physics

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

  1. Question 1

    Waves. This type asked 4 times: 6 Apr 2023, 31 Jan 2024, 4 Apr 2025, 23 Jan 2026 S2. This one: 23 Jan 2026 S2 See all 4 of this type

    25
    The velocity of sound in air is doubled when the temperature is raised from 0∘C0^{\circ}C to α∘C\alpha^{\circ}C. The value of α\alpha is ____\_\_\_\_ .

  2. Question 2

    Electromagnetic Waves. This type asked 4 times: 25 Jun 2022, 27 Jan 2024, 6 Apr 2024, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 4 of this type

    22
    The equation of the electric field of an electromagnetic wave propagating through free space is given by: E=377sin⁡(6.27×103t−2.09×10−5x) N/CE = \sqrt{377}\sin\left( 6.27 \times 10^{3}t - 2.09 \times 10^{- 5}x \right)\ N/C. The average power of the electromagnetic wave is (1α)W/m2\left( \frac{1}{\alpha} \right)W/m^{2}. The value of α\alpha is ____\_\_\_\_ (Take μ0ε0=377\sqrt{\frac{\mu_{0}}{\varepsilon_{0}}} = 377 in SI units)

  3. Question 3

    Magnetism and Matter. This type asked 4 times: 2021 Paper 2, 2021 Paper 4, 2021 Paper 13, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 4 of this type

    20
    Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Consider a ferromagnetic material : Assertion (A) : The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains. Reason (R) : At high enough temperature, the domain structure of ferromagnetic material disintegrates. Thus, magnetization will disappear at high enough temperature known as Curie temperature. In the light of the above statements, choose the correct answer from the options given below :

    Tap an option to check your answer.

  4. Question 4

    Oscillations. This type asked 4 times: 2021 Paper 3, 2021 Paper 13, 29 Jun 2022, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 4 of this type

    6
    A simple pendulum of string length 30 cm performs 20 oscillations in 10s. The length of the string required for the pendulum to perform 40 oscillations in the same time duration is ____\_\_\_\_ cm. [Assume that the mass of the pendulum remains same.]

    Tap an option to check your answer.

  5. Question 5

    Ray Optics. This type asked 4 times: 27 Jul 2022, 30 Jan 2023, 28 Jan 2025, 23 Jan 2026 S1. This one: 23 Jan 2026 S1 See all 4 of this type

    1
    A thin prism with angle 5∘5^{\circ} of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is ____\_\_\_\_ .

    Tap an option to check your answer.