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The picture tube of a black and white T. V. the set has only one electron gun that produces the picture on its screen. The number of electron guns, a colour picture tube has, is:
  1. 4
  2. 6
  3. 3
  4. 7
Explanation

In a colour-television tube, three electron guns (red, green, and blue) fire electrons toward the phosphor-coated screen.


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