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Day 457: JEE Mains Physics

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

  1. Question 1

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

    3
    Two blocks of masses 2 kg and 1 kg respectively, are tied to the ends of a string which passes over a light frictionless pulley as shown in the figure below. The masses are held at rest at the same horizontal level and then released. The distance traversed by the centre of mass in 2 s is ____\_\_\_\_ m. (Take g=10 m/s2g = 10\text{ }m/s^{2})

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  2. Question 2

    Thermal Properties of Matter. Asked once: 22 Jan 2025

    23
    Three conductors of same length having thermal conductivity k1,k2k_{1},k_{2} and k3k_{3} are connected as shown in figure. Area of cross sections of 1st1^{\text{st}} and 2nd2^{\text{nd}} conductor are same and for 3rd3^{\text{rd}} conductor it is double of the 1st1^{\text{st}} conductor. The temperatures are given in the figure. In steady state condition, the value of θ\theta is ____  ∘C\ ^{\circ}C. (Given: k1=60 Js−1m−1K−1k_{1} = 60\ Js^{- 1}m^{- 1}K^{- 1}, k2=120 Js−1m−1K−1k_{2} = 120\ Js^{- 1}m^{- 1}K^{- 1}, k3=135 Js−1m−1K−1k_{3} = 135\ Js^{- 1}m^{- 1}K^{- 1})

  3. Question 3

    Thermodynamics. Asked once: 24 Jan 2026 S2

    18
    10 mole of an ideal gas is undergoing the process shown in the figure. The heat involved in the process from P1P_{1} to P2P_{2} is α\alpha Joule (P1=21.7 Pa\left( P_{1}= 21.7\text{ }Pa \right. and  P2=30 Pa,Cv=21 J/K.mol,R=8.3 J/mol.K)\left. \ P_{2}= 30\text{ }Pa,C_{v}= 21\text{ }J/K.mol,R = 8.3\text{ }J/mol.K \right). The value of α\alpha is ____\_\_\_\_.

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  4. Question 4

    Units and Measurements. Asked once: 21 Jan 2026 S2

    12
    A spherical body of radius rr and density σ\sigma falls freely through a viscous liquid having density ρ\rho and viscosity η\eta and attains a terminal velocity v0v_{0}. Estimated maximum error in the quantity η\eta is : (Ignore errors associated with σ,ρ\sigma,\rho and g , gravitational acceleration)

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  5. Question 5

    Wave Optics. Asked once: 24 Jan 2025

    95
    In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of P1P_{1} and P2P_{2} are orthogonal to each other. The polarizer P3P_{3} covers both the slits with its transmission axis at 45∘45^{\circ} to those of P1P_{1} and P2P_{2}. An unpolarized light of wavelength λ\lambda and intensity I0I_{0} is incident on P1P_{1} and P2P_{2}. The intensity at a point after P3P_{3} where the path difference between the light waves from s1s_{1} and s2s_{2} is λ3\frac{\lambda}{3}, is

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