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Day 254: JEE Mains Physics

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

  1. Question 1

    Wave Optics. Asked once: 2 Apr 2025 (same type asked 10 times) See all 10 of this type

    23
    If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is 30∘30^{\circ} in a single slit diffraction pattern recorded using 628 nm light, then the width of the slit is ____\_\_\_\_ μm\mu m.

  2. Question 2

    Units and Measurements. Asked once: 8 Apr 2024 (same type asked 10 times) See all 10 of this type

    108
    Least count of a vernier caliper is 120 N cm\frac{1}{20\text{ }N}\text{ }cm. The value of one division on the main scale is 1 mm1\text{ }mm. Then the number of divisions of main scale that coincide with NN divisions of vernier scale is :

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  3. Question 3

    Moving Charges and Magnetism. Asked once: 25 Jul 2022 (same type asked 10 times) See all 10 of this type

    11
    Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If the ratio of radii of their circular paths is 6:56:5 and their respective masses ratio is 9:49:4. Then, the ratio of their charges will be :

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  4. Question 4

    Waves. Asked once: 4 Apr 2025 (same type asked 9 times) See all 9 of this type

    93
    Displacement of a wave is expressed as x(t)=5cos⁡(628t+π2)mx(t) = 5\cos\left( 628t+\frac{\pi}{2} \right)m. The wavelength of the wave when its velocity is 300 m/s300\text{ }m/s is :

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  5. Question 5

    Ray Optics. Asked once: 29 Jan 2025 (same type asked 9 times) See all 9 of this type

    88
    A convex lens made of glass (refractive index == 1.5) has focal length 24 cm in air. When it is totally immersed in water (refractive index =1.33= 1.33 ), its focal length changes to

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