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Day 299: JEE Mains Physics

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

  1. Question 1

    Work, Energy and Power. Asked once: 2021 Paper 25 (same type asked 4 times) See all 4 of this type

    12
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Body ' PP ' having mass MM moving with speed ' uu ' has head-on collision elastically with another body ' QQ ' having mass ' mm ' initially at rest. If m<<Mm < < M, body ' QQ ' will have a maximum speed equal to ' 2u2u ' after collision. Reason R: During elastic collision, the momentum and kinetic energy are both conserved. In the light of the above statements, choose the most appropriate answer from the options given below:

    Tap an option to check your answer.

  2. Question 2

    Current Electricity. Asked once: 2021 Paper 14 (same type asked 4 times) See all 4 of this type

    15
    In a potentiometer setup, EMF of primary cell is 6 V6\text{ }V and internal resistance is 20Ω20\Omega. The potentiometer wire is of length 10 m10\text{ }m having 0.1Ω/cm0.1\Omega/cm. This setup is used to find EMF of a cell which is balanced at 5.5 m5.5\text{ }m mark. Find EMF of the cell.

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  3. Question 3

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 4 (same type asked 4 times) See all 4 of this type

    11
    An electron of mass mem_{e} and a proton of mass mp=1836mem_{p}= 1836m_{e} are moving with the same speed. The ratio of their de Broglie wavelength λelectron λproton \frac{\lambda_{\text{electron~}}}{\lambda_{\text{proton~}}} will be:

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  4. Question 4

    Waves. Asked once: 2021 Paper 21 (same type asked 4 times) See all 4 of this type

    30
    A tuning fork is vibrating at 250 Hz250\text{ }Hz. The length of the shortest closed organ pipe that will resonate with the tuning fork will be ____\_\_\_\_ cmcm. (Take speed of sound in air as 340 ms−1340{\text{ }ms}^{- 1} )

  5. Question 5

    Electrostatics. Asked once: 26 Jul 2022 (same type asked 3 times) See all 3 of this type

    117
    Three point charges of magnitude 5μC,0.16μC5\mu C,0.16\mu C and 0.3μC0.3\mu C are located at the vertices A,B,CA,B,C of a right angled triangle whose sides are AB=3 cmAB = 3\text{ }cm, BC=32 cmBC = 3\sqrt{2}\text{ }cm and CA=3 cmCA = 3\text{ }cm and point AA is the right angle corner. Charge at point A experiences ____\_\_\_\_ NN of electrostatic force due to the other two charges.