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Day 490: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. Asked once: 28 Jan 2025

    21
    A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm , respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be x100\frac{x}{100} where x is ____\_\_\_\_

  2. Question 2

    Wave Optics. Asked once: 26 Jun 2022

    16
    In free space, an electromagnetic wave of 3GHz3GHz frequency strikes over the edge of an object of size λ100\frac{\lambda}{100}, where λ\lambda is the wavelength of the wave in free space. The phenomenon, which happens there will be:

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  3. Question 3

    Waves. Asked once: 26 Jul 2022

    24
    When a car is approaching the observer, the frequency of horn is 100 Hz100\text{ }Hz. After passing the observer, it is 50 Hz50\text{ }Hz. If the observer moves with the car, the frequency will be x3 Hz\frac{x}{3}\text{ }Hz where x=x =

  4. Question 4

    Work, Energy and Power. Asked once: 28 Jan 2025

    89
    A body of mass 4 kg is placed on a plane at a point PP having coordinate (3,4)m(3,4)m. Under the action of force F→=(2i^+3j^)N\overrightarrow{F}= (2\widehat{i}+ 3\widehat{j})N, it moves to a new point QQ having coordinates (6,10)m(6,10)m in 4 sec . The average power and instantaneous power at the end of 4 sec are in the ratio of :

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  5. Question 5

    Alternating Current. Asked once: 31 Jan 2023

    14
    If R,XLR,X_{L}, and XCX_{C} represent resistance, inductive reactance and capacitive reactance. Then which of the following is dimensionless:

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