Q.The cathode of a CRO is usually coated with 

  • AAlkali metals
  • BTungsten or thorium oxide 
  • CCopper oxide
  • DBarium or strontium oxide 
Correct Answer : (D)

Barium or strontium oxide 

Hints :

The cathode of a CRO is usually coated with Barium or strontium oxide.

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