TNPSC Physics Study Material in English & Tamil - 2

Question: 6

The spectrum consisting of a number of bright bands with a sharp edge at one end but fading out at the other end is called

(A) Band spectrum

(B) Fraunhofer line

(C) Line spectrum

(D) Continuous spectrum

Question: 7

Band spectrum are obtained from

(A) Sodium vapour lamp

(B) Electric filament lamps

(C) Molecules

(D) Atoms in gaseous state

Question: 8

When the light emitted from a source is made to pass through an absorbing material, the spectrum obtained is called ______ spectrum.

(A) Diffraction

(B) Molecular

(C) Emission

(D) Absorption

Question: 9

In the reverse biased condition of the PN junction diode the flow of reverse current is of the order of

(A) Nanoamperes

(B) Microamperes

(C) Amperes

(D) Milliamperes

Question: 10

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

(A) Emitter to collector

(B) Emitter to base

(C) Base to collector

(D) Base to emitter