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Day 577: JEE Mains Physics

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

  1. Question 1

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

    120
    Two inclined planes are placed as shown in figure. A block is projected from the Point A of inclined plane ABAB along its surface with a velocity just sufficient to carry it to the top Point B at a height 10 m10\text{ }m. After reaching the Point B the block slides down on inclined plane BC. Time it takes to reach to the point CC from point AA is t(2+1)st(\sqrt{2}+ 1)s. The value of tt is.... (use g=10 m/s2g = 10\text{ }m/s^{2} )

  2. Question 2

    Ray Optics. Asked once: 28 Jul 2022

    118
    An object ' oo ' is placed at a distance of 100 cm100\text{ }cm in front of a concave mirror of radius of curvature 200 cm200\text{ }cm as shown in the figure. The object starts moving towards the mirror at a speed 2 cm/s2\text{ }cm/s. The position of the image from the mirror after 10 s10\text{ }s will be at ____\_\_\_\_ cmcm.

  3. Question 3

    Semiconductor Electronics. Asked once: 8 Apr 2024

    118
    A potential divider circuit is connected with a dc source of 20 V20\text{ }V, a light emitting diode of glow in voltage 1.8 V1.8\text{ }V and a zener diode of breakdown voltage of 3.2 V3.2\text{ }V. The length (PR) of the resistive wire is 20 cm20\text{ }cm. The minimum length of PQPQ to just glow the LED is ______ cmcm.

  4. Question 4

    System of Particles and Rotational Motion. Asked once: 26 Jul 2022

    22
    A disc of mass 1 kg1\text{ }kg and radius RR is free of rotate about a horizontal axis passing through its centre and perpendicular to the plane of disc. A body of same mass as that of disc is fixed at the highest point of the disc. Now the system is released, when the body comes to the lowest position, its angular speed will be 4x3Rrad s−14\sqrt{\frac{x}{3R}}{rad\text{ }s}^{- 1} where x= (g=10 ms−2)x = \ \left( g = 10{\text{ }ms}^{- 2} \right)

  5. Question 5

    Thermodynamics. Asked once: 2021 Paper 5

    10
    In thermodynamics, heat and work are:

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