Science Physics Quiz Questions and Answers - 2

Question: 6

With increase of temperature, resistance of conductors

(A) Tends to infinity

(B) Increases

(C) Decreases

(D) Remains the same

Question: 7

An electronic circuit which converts energy from a d.c. source into a periodically varying output is called

(A) Modulator

(B) Oscillator

(C) Amplifier

(D) Rectifier

Question: 8

When a PNP transistor is forward biased the conventional current flows from

(A) Emitter to base

(B) Emitter to collector

(C) Base to collector

(D) Base to emitter

Question: 9

The arrow on the PN junction diode points the direction of

(A) P-end

(B) N-end

(C) Conventional current

(D) Flow of electrons

Question: 10

In N type and P type semiconductor materials the four valence electrons of germanium are shared with valency electrons of impurity added to form

(A) Covalent bond

(B) Valence bond

(C) Co-ordinate bond

(D) Ionic bond