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Day 67: JEE Mains Physics

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

  1. Question 1

    Thermal Properties of Matter. This type asked 3 times: 29 Jun 2022, 24 Jan 2023, 21 Jan 2026 S1. This one: 21 Jan 2026 S1 See all 3 of this type

    15
    An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30∘C30^{\circ}C. The coefficient of linear expansion of aluminium and steel are 24×10−6/ ∘C24 \times 10^{- 6}/\ ^{\circ}C and 1.2×10−5/ ∘C1.2 \times 10^{- 5}/\ ^{\circ}C, respectively. The length of this composite rod when its temperature is raised to 100∘C100^{\circ}C, is ____\_\_\_\_ cm.

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  2. Question 2

    Electrostatics. This type asked 3 times: 29 Jan 2024, 8 Apr 2024, 7 Apr 2025. This one: 7 Apr 2025 See all 3 of this type

    99
    The electric field in a region is given by E→=(2i^+4j^+6k^)×103 N/C\overrightarrow{E} = (2\widehat{i} + 4\widehat{j} + 6\widehat{k}) \times 10^{3}\text{ }N/C. The flux of the field through a rectangular surface parallel to x−zx - z plane is 6.0Nm2C−16.0{Nm}^{2}C^{- 1}. The area of the surface is ____\_\_\_\_ cm2{cm}^{2}.

  3. Question 3

    Magnetism and Matter. This type asked 3 times: 28 Jun 2022, 11 Apr 2023, 7 Apr 2025. This one: 7 Apr 2025 See all 3 of this type

    7
    The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility χmg=1.2×10−5\chi_{mg}= 1.2 \times10^{- 5} ) is :

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  4. Question 4

    Ray Optics. This type asked 3 times: 13 Apr 2023, 27 Jan 2024, 7 Apr 2025. This one: 7 Apr 2025 See all 3 of this type

    23
    A container contains a liquid with refractive index of 1.2 up to a height of 60 cm and another liquid having refractive index 1.6 is added to height H above first liquid. If viewed from above, the apparent shift in the position of bottom of container is 40 cm . The value of H is ____\_\_\_\_ cm . (Consider liquids are immisible)

  5. Question 5

    Units and Measurements. This type asked 3 times: 8 Apr 2023, 2 Apr 2025, 7 Apr 2025. This one: 7 Apr 2025 See all 3 of this type

    79
    The dimension of μ0ϵ0\sqrt{\frac{\mu_{0}}{\epsilon_{0}}} is equal to that of : ( μ0=\mu_{0}= Vacuum permeability and ϵ0=\epsilon_{0}= Vacuum permittivity)

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