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Day 574: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 8 Apr 2024

    102
    Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be ____\_\_\_\_ to ____\_\_\_\_ times of its initial length if the water is to be boiled in 15 minutes.

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  2. Question 2

    Electrostatics. Asked once: 8 Apr 2024

    113
    If the net electric field at point PP along YY axis is zero, then the ratio of ∣q2q3∣\left| \frac{q_{2}}{q_{3}} \right| is 85x\frac{8}{5\sqrt{x}}, where x=x = _________

  3. Question 3

    Laws of Motion. Asked once: 25 Jul 2022

    95
    For a free body diagram shown in the figure, the four forces are applied in the ' xx ' and ' yy ' directions. What additional force must be applied and at what angle with positive xx-axis so that the net acceleration of body is zero?

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  4. Question 4

    Motion in a Plane. Asked once: 26 Jun 2022

    4
    A ball is released from rest from point PP of a smooth semi-spherical vessel as shown in figure. The ratio of the centripetal force and normal reaction on the ball at point QQ is AA while angular position of point QQ is α\alpha with respect to point PP. Which of the following graphs represent the correct relation between AA and α\alpha when ball goes from QQ to RR ?

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  5. Question 5

    Motion in a Straight Line. Asked once: 27 Jul 2022

    2
    A bullet is shot vertically downwards with an initial velocity of 100 m/s100\text{ }m/s from a certain height. Within 10 s10\text{ }s, the bullet reaches the ground and instantaneously comes to rest due to the perfectly inelastic collision. The velocity-time curve for total time t=20 st = 20\text{ }s will be : (Take  g=10 m/s2)\left. \ g = 10\text{ }m/s^{2} \right)

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