Q.1 _____ is defined as radiant energy from a hot body which produces the visual sensation upon the human eye. A. Light B. Glare C. Luminous flux D. none of the above Ans.: A Q.2 What is the aim of artificial light? A. Supplement the day light B. Even to replace day light completely C. Both A and B D. all of the above Ans.: C Q.3 The advantages of good lighting system is/are__ A. ensures increase in production B. Reduces worker’s fatigue, C. protects worker’s health, eyes and nervous system and accidents D. all of the above Ans.: D Q.4 The light radiations are emitted from within the atom in specific quantity in succession called ____. A. light quanta B. photons C. Both A and B D. light energy Ans.: C Q.5 All the electromagnetic waves have same speed of ______ in free space. A. 3 x 10 8 meters/sec B. 3 x 10 10 meters/sec C