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Day 246: JEE Mains Physics

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

  1. Question 1

    Oscillations. Asked once: 2021 Paper 23 (same type asked 2 times) See all 2 of this type

    9
    A bob of mass ' mm ' suspended by a thread of length ll undergoes simple harmonic oscillations with time period TT. If the bob is immersed in a liquid that has density 14\frac{1}{4} times that of the bob and the length of the thread is increased by 1/3rd 1/3^{\text{rd~}} of the original length, then the time period of the simple harmonic oscillations will be :-

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  2. Question 2

    Ray Optics. Asked once: 27 Jun 2022 (same type asked 2 times) See all 2 of this type

    17
    Consider a light ray travelling in air is incident into a medium of refractive index 2n\sqrt{2n}. The incident angle is twice that of refracting angle. Then, the angle of incidence will be:

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  3. Question 3

    Kinetic Theory. Asked once: 14 Jun 2022 (same type asked 2 times) See all 2 of this type

    21
     0.056 kg\ 0.056\text{ }kg of Nitrogen is enclosed in a vessel at a temperature of 127∘C127^{\circ}C. The amount of heat required to double the speed of its molecules is _____ kcal. (Take R=2R = 2 cal mole  −1 K−1\ ^{- 1}{\text{ }K}^{- 1} )

  4. Question 4

    Electrostatics. Asked once: 2021 Paper 2 (same type asked 2 times) See all 2 of this type

    17
    Two electrons each are fixed at a distance 2d2d. A third charge proton placed at the midpoint is displaced slightly by a distance x(x<<d)x(x< <d) perpendicular to the line joining the two fixed charges. Proton will execute simple harmonic motion having angular frequency: ( m=m= mass of charged particle)

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  5. Question 5

    Moving Charges and Magnetism. Asked once: 2021 Paper 19 (same type asked 2 times) See all 2 of this type

    23
    If the maximum value of accelerating potential provided by a radio frequency oscillator is 12kV12kV. The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is [mp=1.67×10−27 kg,e=1.6×10−19C,\left\lbrack m_{p}= 1.67 \times10^{- 27}\text{ }kg,e = 1.6 \times10^{- 19}C, \right. Speed of light =3×108 m/s= 3 \times10^{8}\text{ }m/s ]