31. The magnetic needle always points in _________ direction.

1. 1. East - West

   
   
   

   2. West - South

   
   
   

   3. North - South

   
   
   

   4. North - East

   
   
   

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   The magnetic needle always points North-South direction. Magnetic north towards geographic south and magnetic south pole towards geographic north pole.

   Correct Option: C

   The magnetic needle always points North-South direction. Magnetic north towards geographic south and magnetic south pole towards geographic north pole.

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32. When the temperature of semiconductor is increased, its electrical conductivity

1. 1. Increases

   
   
   

   2. Remains the same

   
   
   

   3. Devreases

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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33. With the rise of temperature, the specific resistance of semiconductor

1. 1. Increases

   
   
   

   2. Remains unchanged

   
   
   

   3. Decreases

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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34. The technique of collecting information about an object from a distance without making physical contact with it is

1. 1. Remote sensing

   
   
   

   2. Remote control

   
   
   

   3. Remote accessing

   
   
   

   4. Space shuttle

   
   
   

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   NA

   Correct Option: A

   NA

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35. The frequency band used for radar relay - systems and television is

1. 1. UHF

   
   
   

   2. VLF

   
   
   

   3. VHF

   
   
   

   4. EHF

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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