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Day 441: JEE Mains Physics

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

  1. Question 1

    Thermal Properties of Matter. Asked once: 4 Apr 2026 S2

    9
    The temperature of a metal strip having coefficient of linear expansion α\alpha is increased from T1T_{1} to T2T_{2} resulting in increase of its length by ΔL1\Delta L_{1}. The temperature is further increased from T2T_{2} to T3T_{3} such that the increase in its length is ΔL2\Delta L_{2}. Given T3+T1=2 T2T_{3}+T_{1}= 2{\text{ }T}_{2} and T2−T1=ΔTT_{2}-T_{1}= \Delta T, the value of ΔL2\Delta L_{2} is ____\_\_\_\_ .

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  2. Question 2

    Thermodynamics. Asked once: 6 Apr 2026 S1

    25
    A certain gas is isothermally compressed to (13)rd \left( \frac{1}{3} \right)^{\text{rd~}} of its initial volume ( V0=3V_{0} = 3 litre) by applying required pressure. If the bulk modulus of the gas is 3×105 N/m23 \times 10^{5}\text{ }N/m^{2}, the magnitude of work done on the gas is ____\_\_\_\_ J.

  3. Question 3

    Units and Measurements. Asked once: 28 Jan 2026 S2

    7
    In an experiment, a set of reading are obtained: 1.24 mm,1.25 mm,1.23 mm,1.21 mm1.24\text{ }mm, 1.25\text{ }mm, 1.23\text{ }mm, 1.21\text{ }mm. The expected least count of the instrument used in recording these readings is ____\_\_\_\_ mm.

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  4. Question 4

    Wave Optics. Asked once: 4 Apr 2026 S1

    20
    An unpolarized light is incident on the plane interface of air-dielectric medium shown in figure. If the incident angle is equal to Brewster angle, identify the expression representing reflected wave.

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  5. Question 5

    Waves. Asked once: 21 Jan 2026 S1

    18
    Two strings (A, B) having linear densities μA=2×10−4 kg/m\mu_{A}= 2 \times10^{- 4}\text{ }kg/m and μB=4×10−4 kg/m\mu_{B}= 4 \times10^{- 4}\text{ }kg/m and lengths LA=2.5 mL_{A}= 2.5\text{ }m and LB=1.5 mL_{B}= 1.5\text{ }m respectively are joined. Free ends of A and B are tied to two rigid supports C and D, respectively creating a tension of 500 N in the wire. Two identical pulses, sent from C and D ends, take time t1t_{1} and t2t_{2}, respectively, to reach the joint. The ratio t1/t2t_{1}/t_{2} is :

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