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Day 355: JEE Mains Physics

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

  1. Question 1

    Motion in a Plane. Asked once: 2021 Paper 6 (same type asked 4 times) See all 4 of this type

    5
    A mosquito is moving with a velocity v→=0.5t2i^+3tj^+9k^ m/s\overrightarrow{v}= 0.5t^{2}\widehat{i}+ 3t\widehat{j}+ 9\widehat{k}\text{ }m/s and accelerating in uniform conditions. What will be the direction of mosquito after 2 s2\text{ }s ?

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  2. Question 2

    Motion in a Plane. Asked once: 8 Apr 2023 (same type asked 4 times) See all 4 of this type

    2
    Two projectiles AA and BB are thrown with initial velocities of 40 m/s40\text{ }m/s and 60 m/s60\text{ }m/s at angles 30∘30^{\circ} and 60∘60^{\circ} with the horizontal respectively. The ratio of their ranges respectively is (g=10 m/s2)\left( g = 10\text{ }m/s^{2} \right)

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  3. Question 3

    Work, Energy and Power. Asked once: 24 Jan 2023 (same type asked 4 times) See all 4 of this type

    111
    A body of mass 1 kg1\text{ }kg begins to move under the action of a time dependent force F→=(tı^+3t2ȷ^)N\overrightarrow{F}=\left( t\widehat{\imath}+ 3t^{2}\widehat{\jmath} \right)N, where ı^\widehat{\imath} and ȷ^\widehat{\jmath} are the unit vectors along xx and y axis. The power developed by above force, at the time t=2st = 2s, will be ____\_\_\_\_ W.

  4. Question 4

    Electrostatics. Asked once: 29 Jan 2024 (same type asked 4 times) See all 4 of this type

    5
    Two charges of 5Q5Q and −2Q- 2Q are situated at the points (3a,0)(3a,0) and (−5a,0)( - 5a,0) respectively. The electric flux through a sphere of radius '4a' having center at origin is :

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  5. Question 5

    Ray Optics. Asked once: 26 Jul 2022 (same type asked 4 times) See all 4 of this type

    113
    In the given figure, the face ACAC of the equilateral prism is immersed in a liquid of refractive index ' nn '. For incident angle 60∘60^{\circ} at the side ACAC, the refracted light beam just grazes along face AC. The refractive index of the liquid n=x4n =\frac{\sqrt{x}}{4}. The value of xx is ____\_\_\_\_. (Given refractive index of glass =1.5= 1.5 )