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Day 462: JEE Mains Physics

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

  1. Question 1

    Ray Optics. Asked once: 22 Jan 2026 S2

    6
    In parallax method for the determination of focal length of a concave mirror, the object should always be placed :

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  2. Question 2

    Semiconductor Electronics. Asked once: 4 Apr 2026 S2

    20
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : A diode under reverse- biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically. Reason R : Below the critical voltage limit, only majority charge carriers flow which increases drastically above critical voltage. Choose the correct answer from the options given below.

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 2 Apr 2026 S2

    25
    Moment of inertia about an axis AB for a rod of mass 40 kg and length 3 m is same as that of a solid sphere of mass of 10 kg and radius R about an axis parallel to AB axis with separation of 3 m as shown in figure below. The value of R is given as α2\sqrt{\frac{\alpha}{2}}. The value of α\alpha is ____\_\_\_\_ .

  4. Question 4

    Thermal Properties of Matter. Asked once: 22 Jan 2025

    6
    An amount of ice of mass 10−3 kg10^{- 3}\text{ }kg and temperature −10∘C-10^{\circ}C is transformed to vapour of temperature 110∘C110^{\circ}C by applying heat. The total amount of work required for this conversion is, (Take, specific heat of ice =2100Jkg−1 K−1= 2100Jkg^{- 1}{\text{ }K}^{- 1}, specific heat of water =4180Jkg−1 K−1= 4180Jkg^{- 1}{\text{ }K}^{- 1}, specific heat of steam =1920Jkg−1 K−1= 1920Jkg^{- 1}{\text{ }K}^{- 1}, Latent heat of ice =3.35×105Jkg−1= 3.35 \times10^{5}Jkg^{- 1} and Latent heat of steam =2.25×106Jkg−1= 2.25 \times10^{6}Jkg^{- 1} )

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  5. Question 5

    Thermodynamics. Asked once: 23 Jan 2026 S2

    14
    One mole of an ideal diatomic gas expands from volume V to 2 V isothermally at a temperature 27∘C27^{\circ}C and does W joule of work. If the gas undergoes same magnitude of expansion adiabatically from 27∘C27^{\circ}C doing the same amount of work W, then its final temperature will be (close to) ____\_\_\_\_  ∘C\ ^{\circ}C.

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