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Day 558: JEE Mains Physics

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

  1. Question 1

    Laws of Motion. Asked once: 28 Jul 2022

    4
    A balloon has mass of 10 g10\text{ }g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s4.5\text{ }cm/s. If the balloon shrinks in 5 s5\text{ }s completely. Then, the average force acting on that balloon will be (in dyne).

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  2. Question 2

    Motion in a Plane. Asked once: 29 Jul 2022

    4
    A smooth circular groove has a smooth vertical wall as shown in figure. A block of mass mm moves against the wall with a speed vv. Which of the following curve represents the correct relation between the normal reaction on the block by the wall (N)(N) and speed of the block (v)(v) ?

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  3. Question 3

    Motion in a Straight Line. Asked once: 29 Jul 2022

    2
    A ball is thrown up vertically with a certain velocity so that, it reaches a maximum height hh. Find the ratio of the times in which it is at height h3\frac{h}{3} while going up and coming down respectively.

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  4. Question 4

    Ray Optics. Asked once: 6 Apr 2023

    21
    A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2.15 m2.15\text{ }m within water when sunlight is incident at an angle of 30∘30^{\circ} with the surface of water. If swimming pool is filled to a height of 1.5 m1.5\text{ }m, then the height of the pole above the water surface in centimetres is (nw=43)\left( n_{w}=\frac{4}{3} \right)____

  5. Question 5

    Semiconductor Electronics. Asked once: 24 Jan 2025

    6
    Consider the following statements : (A) The junction area of solar cell is made very narrow compared to a photo diode. (B) Solar cells are not connected with any external bias. (C) LED is made of lightly doped p-n junction. (D) Increase of forward current results in continuous increase of LED light intensity. (E) LEDs have to be connected in forward bias for emission of light.

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