116. In electromagnetic waves, polarization—

1. 1. Is caused by reflection

   
   
   

   2. Is due to the transverse nature of the waves

   
   
   

   3. Results from the longitudinal nature of the waves

   
   
   

   4. Is always vertical in an isotropic medium
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   In electromagnetic waves, polarization is due to the transverse nature of the waves.
   

   Correct Option: B

   In electromagnetic waves, polarization is due to the transverse nature of the waves.
   

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117. The ground wave eventually disappears, as one moves away from the transmitter, because of—
     

1. 1. Interference from the sky wave

   
   
   

   2. Loss of line-of-sight conditions

   
   
   

   3. Maximum single-hop distance limitation

   
   
   

   4. Tilting

   
   
   

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1. View Hint View Answer Discuss in Forum

   The ground wave eventually disappears, as one moves away from the transmitter because of tilting.
   

   Correct Option: D

   The ground wave eventually disappears, as one moves away from the transmitter because of tilting.
   

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118. Tropospheric scatter is used with frequencies in the following range—

1. 1. HF

   
   
   

   2. VHF

   
   
   

   3. UHF

   
   
   

   4. VLF

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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119. Frequencies in the UHF range normally propagate by means of—

1. 1. Ground waves

   
   
   

   2. Sky waves

   
   
   

   3. Surface waves

   
   
   

   4. Space waves

   
   
   

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1. View Hint View Answer Discuss in Forum

   Frequencies in the UHF range normally propagate by means of space waves.
   

   Correct Option: D

   Frequencies in the UHF range normally propagate by means of space waves.
   

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120. A range of microwave frequencies more easily passed by the atmosphere than are the others is called a—

1. 1. Windows

   
   
   

   2. Critical frequency

   
   
   

   3. Gyro frequency range

   
   
   

   4. Resonance in the atmosphere

   
   
   

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1. View Hint View Answer Discuss in Forum

   A range of microwave frequencies more easily passed by the atmospheric than are the others is called a window.
   

   Correct Option: A

   A range of microwave frequencies more easily passed by the atmospheric than are the others is called a window.
   

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