1. . According to quantum theory, light radiates from the source in the form of
(A) waves
(B) both a & b
(C) plasma
(D) tiny energy packets
2. . The unit of luminous flux is
(A) Lumen
(B) Watt
(C) Candela
(D) Lumen hour
3. . Intensity of light decreases as distance from the light source increases is
(A) Inverse square law
(B) Reflection law
(C) Lambert’s cosine law
(D) All of these
4. . The value of depreciation factor is always
(A) Unity
(B) Less than unity
(C) More than unity
(D) a & c
5. . Qualities of good lighting scheme
(A) Produces glare
(B) Uniform distribution of light
(C) Produces hard shadows
(D) All these
6. . Function of reflectors is
(A) All of above
(B) Controls the loss of light
(C) Reduces the amount of glare
(D) Throws the light on long distance
7. . It is an example of natural source of light
(A) Candles
(B) Fire
(C) Kerosene lamp
(D) Moon
8. . Halogen lamp is type of
(A) Tungsten filament lamps
(B) Fluorescent lamps
(C) Discharge lamps
(D) None these
9. . In the circuit of high pressure mercury vapor lamp, capacitor helps to
(A) Controls the discharge
(B) Improves the power factor
(C) Maintain voltage
(D) Vaporize mercury
10. . The light of fluorescent lamp fluctuates
(A) At twice the supply frequency
(B) At the rate of supply frequency
(C) Half time of the supply frequency
(D) None of these
11. . In this type of lamp, electrical energy is directly converted into light energy
(A) Incandescent lamp
(B) Discharge lamp
(C) Sodium vapor lamp
(D) LED lamp
12. . An LED driver circuit protects LEDs from fluctuations in
(A) a & c
(B) Frequency
(C) Current
(D) Voltage