UGC NET Physics Questions
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Questions and Answers

What happens to the maximum kinetic energy of emitted photoelectrons if the intensity of illumination is reduced to one fourth of its original value?

  • It becomes one fourth of the original value.
  • It becomes twice the original value.
  • It becomes four times the original value.
  • It remains unchanged. (correct)
  • What is the expression for the torque acting on a rectangular coil carrying current 'I' situated parallel to magnetic field induction 'B', having number of turns 'n' and area 'A'?

  • nBA × i (correct)
  • ni A B ˆ
  • ni A B
  • nBA i
  • A force F = -5i + 7j + 3k ˆ acts on a particle, causing a displacement s = -3i + 2j + ak ˆ. If the work done is 14J, what is the value of 'a'?

  • 5
  • 1 (correct)
  • 15
  • 0
  • When an electron in a hydrogen atom jumps from the fourth Bohr orbit to the second Bohr orbit, which spectral line is obtained?

    <p>Second line of Balmer series</p> Signup and view all the answers

    What is the condition for diffraction to occur when light of wavelength 'λ' is incident on a single slit of width 'a'?

    <p>λ &lt; a</p> Signup and view all the answers

    What is the parameter that determines the diffraction pattern when light of wavelength 'λ' is incident on a single slit of width 'a' and the distance between slit and screen is 'D'?

    <p>λ/a</p> Signup and view all the answers

    What is the relation between the slit width and the width of the central maximum in a diffraction pattern if 'D' is equal to 2aλ?

    <p>The slit width is equal to the width of the central maximum</p> Signup and view all the answers

    What is the angle between the change in velocity (δv) and linear velocity (v) in U.C.M. when time interval δt →0?

    <p>0°</p> Signup and view all the answers

    What is the length of a stretched string fixed at both ends with 'm' nodes?

    <p>2mλ</p> Signup and view all the answers

    What is the periodic time of a linear simple harmonic motion of amplitude 'A' when the particle is midway between its mean and extreme position?

    <p>2π√3s</p> Signup and view all the answers

    What is the moment of inertia of a system of three identical rods each of mass 'M' and length 'L' joined to form a symbol 'H' about one of the sides of 'H'?

    <p>2/3ML²</p> Signup and view all the answers

    What is the phenomenon responsible for the luminous border that surrounds the profile of a mountain just before sun rises behind it?

    <p>Diffraction</p> Signup and view all the answers

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