Class 12

Semiconductor Electronics question bank (Physics)

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Q1.

In an electron gun,the control grid is given a negative potential relative to the cathode in order to:

(A)
Decelerate electrons
(B)
Repel electrons and thus to control the number of electrons passing through it
(C)
Select electrons of the same velocity and converge them along the axis
(D)
Decrease the kinetic energy of electrons
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Q2.

The current conduction in a discharge tube is due to

(A)
Electrons only
(B)
$+ve$ ions and electrons
(C)
$-ve$ ions and electrons
(D)
$+ve$ ions,$-ve$ ions and electrons
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