Following are some of the multiple choice questions on the **Illumination** with answers that will help the students in developing their knowledge.

## Illumination MCQ

### 1. Filament lamps normally operate at a power factor of

### 2. The polar curves are used to find out the

### 3. With increase in temperature of the body, the emission of light waves is

### 4. Which gas is sometimes used in filament lamps ?

### 5. Which off the following is present inside the fluorescent tube?

### 7. Frequency mentioned in definition of 1 Candela is

### 8. Direct lighting provide maximum light flux

### 9. A light source having an intensity of 1000 candle in all direction is fitted with a reflector so that it directs 75 % of its light flux along a beam having a divergence of 20 degree. What is the total light flux emitted along the beam? What will be the average illumination produced on a surface normal to the beam direction at a distance of 11.5 m?

### 10. The illuminance of direct sunlight on Earth is about 1×1051\times10^51×105 lx. A light on a stage has an intensity in a certain direction of 5×1065\times10^65×106 cd. At what distance from the stage does a member of the audience experience an illuminance equal to that of sunlight?

### 11. Halo System HTH_THT is a type of

### 12. In 1987 a supernova was observed in a neighboring galaxy. Scientists believed the galaxy was 1.66×10211.66\times10^{21}1.66×1021 m away. How many years prior to the observation did the supernova explosion actually occur?

### 14. Reflection, Refraction and Diffusion comes under ____ characteristics of luminaire

### 15. KTU Course Code for illumination Technology is

### 18. ISI Code for lamp safety requirement is

### 19. Average illuminance over a working plane is given by ___(Assume normal notations)

### 20. Room maintenance factor is the ratio of

### 21. Lamp lumen maintenance factor depends on

### 22. Diversity in interior lighting is the ratio of

### 23. Rousseau's construction is for finding

### 25. Which UGR is most comfortable

### 26. Round each number to the nearest 100. 129

### 27. Round each number to the nearest 100. 67

### 28. Dolores saw 22 boa constrictors and 25 rattlesnakes at the San Diego Zoo. How many snakes did she see in all?

### 29. A fan hanged below the LED light at a Juice store causes irritation to occupants there, technically it is known as

### 30. Round each number to the nearest 100. 443

### 31. Write the number in expanded form. 690

### 33. Write the number in expanded form. 579

### 34. Lambert's cosine law is

### 35. Round each number to the nearest 100.956

### 36. Write the number in expanded form. 403

### 37. If a bright flash light has a light intensity of 25.0 Candela at a distance of 2.00 m from the lens. What is the intensity of the flash light at 75 m away from the lens.

### 38. Inverse square law is ____ (Assume normal notations)

### 39. Textiles shops uses slightly different colored lamps in there show rooms

### 40. Round each number to the nearest 100. 349

### 41. Round each number to the nearest 100. 258

### 42. One candela is 1/___________ of luminous intensity per centimeter square of black body radiating at _______________ Kelvin temperature

### 43. Write the number in expanded form. 742

### 44. Round each number to the nearest 100. 609

### 45. In electromagnetic spectrum the visible light region lies between

### 46. Human eye is most sensitive to ___ with same intensiy

### 47. Round each number to the nearest 10. 572

### 48. Round each number to the nearest 10. 465

### 49. Oscar went to the store and bought 11 Baby Ruths and 15 Butterfingers. How many candy bars did Oscar buy?

### 50. Round each number to the nearest 10. 54

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