COMEDK UGET 2021 Question Paper (Available): Download Question Paper with Answer Key PDF

COMEDK UGET 2021 Questions

• 1.

  A solid cylinder of mass 2 kg and radius 0.2 m is rotating about its own axis without friction with angular velocity 5 rad/s. A particle of mass 1 kg moving with a velocity of 5 m/s strikes the cylinder and sticks to it as shown in figure.
  
  
  The angular velocity of the system after the particle sticks to it will be:

  • 15.0 rad/s
  • 12.0 rad/s
  • 10.0 rad/s
  • 30.0 rad/s
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• 2.

  In a given semiconductor, the ratio of the number density of electron to number density of hole is 2 : 1. If $ \frac{1}{7} $th of the total current is due to the hole and the remaining is due to the electrons, the ratio of the drift velocity of holes to the drift velocity of electrons is :
  

  • \( \frac{2}{3} \)
  • \( \frac{1}{3} \)
  • \( \frac{3}{2} \)
  • \( \frac{1}{7} \)
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• 3.

  A transformer which steps down 330 V to 33 V is to operate a device having impedance 110 $\Omega$. The current drawn by the primary coil of the transformer is:

  • 0.3 A
  • 0.03 A
  • 3 A
  • 1.5 A
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• 4.

  In the Young's double slit experiment, the 2nd bright fringe for red light coincides with the 3rd bright fringe for violet light. Then the value of 'n' is: (Given: wavelength of red light = 6300 $\text{Å}$ and wavelength of violet light = 4200 $\text{Å}$)

  • 2
  • 4
  • 3
  • 1
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• 5.

  If 216 drops of the same size are charged at 200 V each and they combine to form a bigger drop, the potential of the bigger drop will be

  • 2400 V
  • 7200 V
  • 1200 V
  • 8200 V
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