31. The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have

1. 1. 10 protons and 7 electrons

   
   
   

   2. 7 protons and 10 electrons

   
   
   

   3. 4 protons and 7 electrons

   
   
   

   4. 4 protons and 10 eletrons

   
   
   

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   NA

   Correct Option: B

   NA

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32. Cathode rays can be deflected by

1. 1. magnetic filed only

   
   
   

   2. electric field only

   
   
   

   3. both (a) & (b)

   
   
   

   4. none of these

   
   
   

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   NA

   Correct Option: C

   NA

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33. Structure of solids investigated by using

1. 1. cosmic rays

   
   
   

   2. X - rays

   
   
   

   3. infrared

   
   
   

   4. y - rays

   
   
   

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   NA

   Correct Option: B

   NA

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34. The absolute charge of an electron is

1. 1. (-1.6) x 10^-19 C

   
   
   

   2. (+ 1.6) x 10⁺¹⁹ C

   
   
   

   3. 1.6 x 10^-19 C

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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35. Which of the following has highest frequency ?

1. 1. Cosmic rays

   
   
   

   2. X - rays

   
   
   

   3. Radio waves

   
   
   

   4. Micro waves

   
   
   

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   NA

   Correct Option: A

   NA

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