Electricity and Magnetism Objective Questions Answers - 2

Question: 6

The sun looks reddish at sunset and sunrise because

(A) the blue colour in the spectrum is absorbed by the medium

(B) the blue colour is scattered away and red reaches the observer

(C) the blue colour is absent in the solar spectrum at that time

(D) the red colour is scattered away and blue reaches

Question: 7

Cellular phones use radiowaves in

(A) AM band

(B) FM band

(C) short waveband

(D) ultrahigh frequency band

Question: 8

A line spectrum identifies

(A) plasma

(B) solid

(C) liquid

(D) gas

Question: 9

H-polaroids and K-polaroids are prepared from

(A) calcite crystal

(B) polyvinyl alcohol

(C) quartz

(D) NaCl

Question: 10

Atomic spectrum should be

(A) absorption band spectrum

(B) absorption line spectrum

(C) emission band spectrum

(D) pure line spectrum