UGC-NET | UGC NET CS 2017 Jan – III | Question 13

Which of the following statement(s) is/are correct ?
(A) Persistence is the term used to describe the duration of phosphorescence.
(B) The control electrode is used to turn the electron beam on and off.
(C) The electron gun creates a source of electrons which are focussed into a narrow beam directed at the face of CRT.
(D) All of the above

Answer: (D)
Explanation:

1. Persistence is the term used to describe the duration of phosphorescence.
2. The control electrode is used to turn the electron beam on and off.
3. The electron gun creates a source of electrons which are focused into a narrow beam directed at the face of CRT.

All statement are correct.
So, option (D) is correct.
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