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Day 194: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 29 Jan 2025 (same type asked 3 times) See all 3 of this type

    20
    Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Electromagnetic waves carry energy but not momentum. Reason (R): Mass of a photon is zero. In the light of the above statements, choose the most appropriate answer from the options given below :

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  2. Question 2

    Gravitation. Asked once: 29 Jul 2022 (same type asked 3 times) See all 3 of this type

    102
    An object of mass 1 kg1\text{ }kg is taken to a height from the surface of earth which is equal to three times the radius of earth. The gain in potential energy of the object will be [If, g=10 ms−2g = 10{\text{ }ms}^{- 2} and radius of earth =6400 km= 6400\text{ }km ]

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  3. Question 3

    Laws of Motion. Asked once: 30 Jan 2024 (same type asked 3 times) See all 3 of this type

    92
    A block of mass 1 kg1\text{ }kg is pushed up a surface inclined to horizontal at an angle of 60∘60^{\circ} by a force of 10 N10\text{ }N parallel to the inclined surface as shown in figure. When the block is pushed up by 10 m10\text{ }m along inclined surface, the work done against frictional force is: [g=10 m/s2]\left\lbrack g = 10\text{ }m/s^{2} \right\rbrack

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  4. Question 4

    Ray Optics. Asked once: 7 Apr 2025 (same type asked 3 times) See all 3 of this type

    10
    Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially, 10 cm apart. The power of this combination is :

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  5. Question 5

    Mechanical Properties of Solids. Asked once: 4 Apr 2025 (same type asked 3 times) See all 3 of this type

    22
    Two slabs with square cross section of different materials (1,2)(1,2) with equal sides (l)(l) and thickness d1d_{1} and d2d_{2} such that d2=2 d1d_{2} = 2{\text{ }d}_{1} and l>d2l > d_{2}. Considering lower edges of these slabs are fixed to the floor, we apply equal shearing force on the narrow faces. The angle of deformation is θ2=2θ1\theta_{2} = 2\theta_{1}. If the shear modulus of material 1 is 4×109 N/m24 \times 10^{9}\text{ }N/m^{2}, then the shear modulus of material 2 is x×109 N/m2x \times 10^{9}\text{ }N/m^{2}, where the value of xx is ____\_\_\_\_.