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Day 275: JEE Mains Physics

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

  1. Question 1

    Mechanical Properties of Fluids. Asked once: 7 Apr 2025 (same type asked 5 times) See all 5 of this type

    83
    A capillary tube of radius 0.1 mm is partly dipped in water (surface tension 70dyn/cm70dyn/cm and glass water contact angle ≃0∘\simeq0^{\circ} ) with 30∘30^{\circ} inclined with vertical. The length of water risen in the capillary is ____\_\_\_\_ cm. (Take g=9.8 m/s2g = 9.8\text{ }m/s^{2} )

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  2. Question 2

    Wave Optics. Asked once: 6 Apr 2023 (same type asked 5 times) See all 5 of this type

    8
    A monochromatic light wave with wavelength λ1\lambda_{1} and frequency v1v_{1} in air enters another medium. If the angle of incidence and angle of refraction at the interface are 45∘45^{\circ} and 30∘30^{\circ} respectively, then the wavelength λ2\lambda_{2} and frequency v2v_{2} of the refracted wave are :

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  3. Question 3

    System of Particles and Rotational Motion. Asked once: 1 Feb 2023 (same type asked 5 times) See all 5 of this type

    114
    Moment of inertia of a disc of mass MM and radius ' RR ' about any of its diameter is MR24\frac{MR^{2}}{4}. The moment of inertia of this disc about an axis normal to the disc and passing through a point on its edge will be, x2MR2\frac{x}{2}MR^{2}. The value of xx is

  4. Question 4

    Thermal Properties of Matter. Asked once: 13 Apr 2023 (same type asked 5 times) See all 5 of this type

    119
    Two plates AA and BB have thermal conductivities 84Wm−1 K−184Wm^{- 1}{\text{ }K}^{- 1} and 126Wm−1 K−1126Wm^{- 1}{\text{ }K}^{- 1} respectively. They have same surface area and same thickness. They are placed in contact along their surfaces. If the temperatures of the outer surfaces of A and B are kept at 100 ∘C100\ ^{\circ}C and 0 ∘C0\ ^{\circ}C respectively, then the temperature of the surface of contact in steady state is_____  ∘C\ ^{\circ}C.

  5. Question 5

    Electrostatics. Asked once: 27 Jan 2024 (same type asked 5 times) See all 5 of this type

    112
    Two charges of −4μC- 4\mu C and +4μC+ 4\mu C are placed at the points A(1,0,4)mA(1,0,4)m and B(2,−1,5)mB(2, - 1,5)m located in an electric field E→=0.20i^V/cm\overrightarrow{E}= 0.20\widehat{i}V/cm. The magnitude of the torque acting on the dipole is 8α×10−5Nm8\sqrt{\alpha}\times10^{- 5}Nm, Where α=\alpha = . ________