A) 2000 to 6000 volts B) 400 to 440 volts C) ordinary voltages D) very low temperatures. Ans : (A)
A) White oil paint B) Blue curtains C) White plaster work D) Aluminium sheet. Ans : (B)
A) 500 lumens/m2 B) 300 - 400 lumens/m2 C) 100 - 250 lumens/m2 D) 60 - 100 lumens/m2. Ans : (A)
A) yellow colour B) red colour C) blue colour D) green colour. Ans : (D)
A) yellow colour B) green colour C) red colour D) blue colour. Ans : (A)
A) have hot cathode B) have cold cathode C) cannot withstand shocks D) consume high power. Ans : (B)
A) very low luminance B) normal luminance C) excessive luminance D) none of the above. Ans : (C)
A) green radiations B) blue radiations C) violet radiations D) all of the above. Ans : (D)
A) sodium vapour lamp B) fluorescent lamp C) incandescent lamp D) mercury vapour lamp. Ans : (C)
A) yellow colour B) blue colour C) green colour D) red colour. Ans : (D)