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Day 365: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 2021 Paper 23 (same type asked 4 times) See all 4 of this type

    22
    A parallel plate capacitor of capacitance 200μF200\mu F is connected to a battery of 200 V200\text{ }V. A dielectric slab of dielectric constant 2 is now inserted into the space between plates of capacitor while the battery remain connected. The change in the electrostatic energy in the capacitor will be ____\_\_\_\_ J.

  2. Question 2

    Moving Charges and Magnetism. Asked once: 26 Jul 2022 (same type asked 4 times) See all 4 of this type

    107
    A velocity selector consists of electric field E→=Ek^\overrightarrow{E}= E\widehat{k} and magnetic field B→=Bj^\overrightarrow{B}= B\widehat{j} with B=12mTB = 12mT. The value EE required for an electron of energy 728eV728eV moving along the positive xx-axis to pass undeflected is : (Given, mass of electron =9.1×10−31 kg= 9.1 \times10^{- 31}\text{ }kg )

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  3. Question 3

    Mechanical Properties of Solids. Asked once: 28 Jul 2022 (same type asked 4 times) See all 4 of this type

    6
    The force required to stretch a wire of cross-section 1 cm21{\text{ }cm}^{2} to double its length will be: (Given Young's modulus of the wire =2×1011 N/m2= 2 \times10^{11}\text{ }N/m^{2} )

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  4. Question 4

    Motion in a Straight Line. Asked once: 25 Jul 2022 (same type asked 4 times) See all 4 of this type

    21
    A car is moving with speed of 150 km/h150\text{ }km/h and after applying the brake it will move 27 m27\text{ }m before it stops. If the same car is moving with a speed of one third the reported speed then it will stop after travelling ____\_\_\_\_ m distance.

  5. Question 5

    Oscillations. Asked once: 24 Jan 2023 (same type asked 4 times) See all 4 of this type

    117
    A mass mm attached to free end of a spring executes SHM with a period of 1 s1\text{ }s. If the mass is increased by 3 kg3\text{ }kg the period of oscillation increases by one second, the value of mass mm is kgkg.