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Day 69: JEE Mains Physics

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

  1. Question 1

    Semiconductor Electronics. This type asked 3 times: 2021 Paper 18, 25 Jan 2023, 4 Apr 2025. This one: 4 Apr 2025 See all 3 of this type

    91
    Consider a n-type semiconductor in which nen_{e} and nhn_{h} are number of electrons and holes, respectively. (A) Holes are minority carriers (B) The dopant is a pentavalent atom (C) nenh≠ni2n_{e}n_{h} \neq n_{i}^{2} (where nin_{i} is number of electrons or holes in semiconductor when it is intrinsic form) (D) nenh≥ni2n_{e}n_{h} \geq n_{i}^{2} (E) The holes are not generated due to the donors Choose the correct answer from the options given below:

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  2. Question 2

    Thermal Properties of Matter. This type asked 3 times: 2021 Paper 1, 25 Jun 2022, 4 Apr 2025. This one: 4 Apr 2025 See all 3 of this type

    78
    Consider a rectangular sheet of solid material of length l=9 cm\mathcal{l}= 9\text{ }cm and width d=d = 4 cm4\text{ }cm. The coefficient of linear expansion is α=3.1×10−5 K−1\alpha= 3.1 \times10^{- 5}{\text{ }K}^{- 1} at room temperature and one atmospheric pressure. The mass of sheet m=0.1 kgm= 0.1\text{ }kg and the specific heat capacity Cv=900 J kg−1 K−1C_{v}= 900\text{ }J{\text{ }kg}^{- 1}{\text{ }K}^{- 1}. If the amount of heat supplied to the material is 8.1×102 J8.1 \times10^{2}\text{ }J then change in area of the rectangular sheet is :-

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  3. Question 3

    Electrostatics. This type asked 3 times: 31 Jan 2023, 6 Apr 2023, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    14
    The electrostatic potential on the surface of uniformly charged spherical shell of radius R=10 cmR = 10\text{ }cm is 120 V . The potential at the centre of shell, at a distance r=5 cmr = 5\text{ }cm from centre, and at a distance r=15 cmr = 15\text{ }cm from the centre of the shell respectively, are :

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  4. Question 4

    Mechanical Properties of Fluids. This type asked 3 times: 27 Jun 2022, 28 Jul 2022, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    2
    Consider a completely full cylindrical water tank of height 1.6 m and cross-sectional area 0.5 m20.5{\text{ }m}^{2}. It has a small hole in its side at a height 90 cm from the bottom. Assume, the cross-sectional area of the hole to be negligibly small as compared to that of the water tank. If a load 50 kg is applied at the top surface of the water in the tank then the velocity of the water coming out at the instant when the hole is opened is : (g=10 m/s2)\left( g= 10\text{ }m/s^{2} \right)

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  5. Question 5

    Motion in a Plane. This type asked 3 times: 25 Jul 2022, 8 Apr 2024, 3 Apr 2025. This one: 3 Apr 2025 See all 3 of this type

    86
    A particle is projected with velocity uu so that its horizontal range is three times the maximum height attained by it. The horizontal range of the projectile is given as nu225g\frac{nu^{2}}{25g}, where value of nn is : (Given ' gg ' is the acceleration due to gravity).

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