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Day 433: JEE Mains Physics

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

  1. Question 1

    Kinetic Theory. Asked once: 5 Apr 2026 S1

    7
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Change in internal energy of a system containing nn mole of ideal gas can be written as ΔU=nCv(Tf−Ti)=nRγ−1( Tf−Ti)\Delta U = {nC}_{v}\left( T_{f} - T_{i} \right) = \frac{nR}{\gamma - 1}\left( {\text{ }T}_{f} - T_{i} \right), where γ=CpCv,Ti=\gamma = \frac{C_{p}}{C_{v}},T_{i} = initial temperature, Tf=T_{f} = final temperature. Reason R: Relation between degree of freedom ff and γ(=Cp/Cv)\gamma\left( = C_{p}/C_{v} \right) is (γ=1+2f)\left( \gamma = 1 + \frac{2}{f} \right) Choose the correct answer from the options given below

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  2. Question 2

    Laws of Motion. Asked once: 6 Apr 2026 S1

    4
    Two blocks ( P and Q ) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a frictionless pulley which is fixed on the edge of a cube ( S ), as shown in the figure below. Block P is positioned on the top surface which has no friction and block Q is in contact with side-surface, having coefficient friction μ\mu. The cube ( S ) moves towards the right with acceleration of g2\frac{g}{2}, where gg is gravitational acceleration. During this movement the block P and Q remain stationary. The value of μ\mu is ____\_\_\_\_. (take g=10 m/s2g = 10\text{ }m/s^{2} )

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  3. Question 3

    Magnetism and Matter. Asked once: 4 Apr 2026 S2

    23
    Two identical small bar magnets each of dipole moment 35 J/T3\sqrt{5}\text{ }J/T are placed at a center to center separation of 10 cm , with their axes perpendicular to each other as shown in figure. The value of magnetic field at the point P midway between the magnets is α×10−3 T\alpha \times 10^{- 3}\text{ }T. The value of α\alpha is ____\_\_\_\_ . ( μ0=4π×10−7Tm/A\mu_{0} = 4\pi \times 10^{- 7}Tm/A )

  4. Question 4

    Mechanical Properties of Fluids. Asked once: 22 Jan 2026 S1

    8
    Given below are two statements: Statement I: Pressure of fluid is exerted only on a solid surface in contact as the fluid-pressure does not exist everywhere in a still fluid. Statement II: Excess potential energy of the molecules on the surface of a liquid, when compared to interior, results in surface tension. In the light of the above statements, choose the correct answer from the options given below.

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  5. Question 5

    Mechanical Properties of Solids. Asked once: 23 Jan 2026 S1

    10
    The strain-stress plot for materials A,B,CA,B,C and D is shown in the figure. Which material has the largest Young's modulus?

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