Chapter 1 ILLUMINATION MCQs 12 min Score: 0 Attempted: 0/12 Subscribe 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 packetsShow All Answers 2. . The unit of luminous flux is (A) Lumen (B) Watt (C) Candela (D) Lumen hourShow All Answers 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 theseShow All Answers 4. . The value of depreciation factor is always (A) Unity (B) Less than unity (C) More than unity (D) a & cShow All Answers 5. . Qualities of good lighting scheme (A) Produces glare (B) Uniform distribution of light (C) Produces hard shadows (D) All theseShow All Answers 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 distanceShow All Answers 7. . It is an example of natural source of light (A) Candles (B) Fire (C) Kerosene lamp (D) MoonShow All Answers 8. . Halogen lamp is type of (A) Tungsten filament lamps (B) Fluorescent lamps (C) Discharge lamps (D) None theseShow All Answers 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 mercuryShow All Answers 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 theseShow All Answers 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 lampShow All Answers 12. . An LED driver circuit protects LEDs from fluctuations in (A) a & c (B) Frequency (C) Current (D) VoltageShow All Answers
