PYQ Vault

Day 598: JEE Mains Physics

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

  1. Question 1

    Laws of Motion. Asked once: 2021 Paper 18

    17
    The initial mass of a rocket is 1000 kg1000\text{ }kg. Calculate at what rate the fuel should be burnt so that the rocket is given an acceleration of 20 ms−220\text{ }ms^{-2}. The gases come out at a relative speed of 500 ms−1500\text{ }ms^{-1} with respect to the rocket. [Use g=10 m/s2g=10\text{ }m/s^{2}]

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  2. Question 2

    Motion in a Plane. Asked once: 2021 Paper 13

    12
    PP is travelling along the vector A→=i^+j^,Q\overrightarrow{A}=\widehat{i}+\widehat{j},Q is moving along the vector B→=j^+k^\overrightarrow{B}=\widehat{j}+\widehat{k}, RR is moving along the vector C→=−i^+j^\overrightarrow{C}= -\widehat{i}+\widehat{j}. All three particles collide at a point and after collision, P moves along A→×B→\overrightarrow{A}\times\overrightarrow{B} and Q moves along B→×C→\overrightarrow{B}\times\overrightarrow{C}, then the angle between the direction of PP and QQ after collision-

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  3. Question 3

    Ray Optics. Asked once: 2021 Paper 23

    29
    Cross-section view of a prism is the equilateral triangle ABCABC in the figure. The minimum deviation is observed using this prism when the angle of incidence is equal to the prism angle. The time taken by light to travel from PP (midpoint of BCBC ) to AA is ____\_\_\_\_ ×10−10 s\times10^{- 10}\text{ }s. (Given, speed of light in vacuum =3×108 m/s= 3 \times10^{8}\text{ }m/s and cos⁡30∘=32\cos30^{\circ}=\frac{\sqrt{3}}{2})
  4. Question 4

    Semiconductor Electronics. Asked once: 27 Jan 2024

    95
    The truth table of the given circuit diagram is:

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 2021 Paper 12

    9
    A rotating body has an angular velocity of 300rpm300rpm and its angular acceleration is π20(rad/s2)\frac{\pi}{20}\left( rad/s^{2} \right). Revolutions made by this body in 10sec10sec is

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