TNPSC Current Affairs Questions and Answers - 2

Question: 6

Before the Second World War _____ were used in the process of electrical signal generation, amplification and transmission.

(A) semiconducting materials

(B) integrated circuits

(C) vacuum tubes

(D) transistors

Question: 7

Dopants are

(A) liquid atoms

(B) gaseous atoms

(C) pure atoms

(D) impurity atoms

Question: 8

The colour of light emitted by a LED depends on

(A) its reverse bias

(B) its forward bias

(C) type of semiconductor material

(D) the amount of forward current

Question: 9

A TRUTH TABE represents all possible

(A) inputs of a logic circuit

(B) symbols of a logic circuit

(C) outputs of a logic circuit

(D) inputs and outputs of a logic circuit

Question: 10

The colour of the light emitted by the LED will depend upon

(A) the temperature at which it is operated

(B) the voltage at which it is operated

(C) the type of the semiconducting material used

(D) none of the above