1000+ Illumination Multiple Choice Questions and Answers Pdf - 1

Question: 1

Which of the following instruments is used for the comparison of candle powers of different sources?

(A) candle meter

(B) photometer

(C) bunsen meter

(D) radiometer

Question: 2

In electric discharge lamps light is produced by

(A) magnetic effect of current

(B) heating effect of current

(C) ionization in a gas or vapour

(D) cathode ray emission

Question: 3

Which gas can be filled in GLS lamps?

(A) oxygen

(B) carbon dioxide

(C) xenon

(D) any inert gas

Question: 4

Which of the following is present inside the fluorescent tube?

(A) helium and oxygen

(B) mercury vapour

(C) argon and CO₂

(D) argon and neon

Question: 5

Sky appears blue because of

(A) scattering of light over dust particles

(B) radiation

(C) reflection

(D) refraction