About Illumination

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

  • Unity
  • 0.8 lagging
  • 0.5 lagging
  • 0.9 lagging

2. The polar curves are used to find out the

  • MHCP
  • MSCP
  • Both (a) and (b)
  • None of these

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

  • Increases
  • Decreases
  • Remains same
  • None of these

4. Which gas is sometimes used in filament lamps ?

  • Nitrogen
  • Carbon dioxide
  • Aragon
  • Krypton

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

  • Helium and oxygen
  • Aragon and carbon dioxide
  • Aragon and neon
  • Mercury vapour

6. Lux is the unit of

  • Luminous flux
  • Luminous intensity
  • Illumination
  • Luminance

7. Frequency mentioned in definition of 1 Candela is

  • 240 x 10^12 Hz
  • 600 x 10^2 Hz
  • 540 x 10^12 Hz
  • 540 x 10^2 Hz

8. Direct lighting provide maximum light flux

  • Equal to upward and downwards
  • No such restriction
  • downwards
  • Upwards

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?

  • 961.4 lux
  • 323.1 lux
  • 242.0 lux
  • 572.2

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?

  •  1.4×10−1 m1.4\times10^{-1}\ m1.4×10−1 m  
  •  7 m7\ m7 m  
  •  10 m10\ m10 m  
  •  5×101 m5\times10^1\ m5×101 m  

11. Halo System HTH_THT​ is a type of

  • Recessed fixture
  • Track lighting fixture
  • Bollard fixture
  • Under cabin

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?

  • 1.75x10⁵y
  • 3.9x10⁹m
  • 3.84x10⁸m
  • 1. 7x10⁻⁵y

13. UGR is stands for

  • Unified Glare Rating
  • Unitized Group Ration
  • Both A & B
  • none of the above

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

  • Electrical
  • Optical
  • Mechanical
  • Control

15. KTU Course Code for illumination Technology is

  • EE369
  • EE361
  • EE366
  • EE365

16. SHR is

  • Side to Horizontal ratio
  • Space to Horizontal ratio
  • Side to height ratio
  • Space to Height ratio

17. Reduction factor is

  • MSCP/MHCP
  • MHCP/MSCP
  • MHSCP/MSCP
  • MSCP/MHSCP

18. ISI Code for lamp safety requirement is

  • IS 10322
  • IS 10632
  • IS 749
  • IS 3043

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

  •  E = N(n.ϕ).MF.UFAE\ =\ \frac{N\left(n.\phi\right).MF.UF}{A}E = AN(n.ϕ).MF.UF​  
  •  E=N.(nϕ).MFA.UFE=\frac{N.\left(n\phi\right).MF}{A.UF}E=A.UFN.(nϕ).MF​  
  •  E=N(n.ϕ).UFA.MFE=\frac{N\left(n.\phi\right).UF}{A.MF}E=A.MFN(n.ϕ).UF​  
  •  E=n.ϕ.MF.UFNAE=\frac{n.\phi.MF.UF}{NA}E=NAn.ϕ.MF.UF​  

20. Room maintenance factor is the ratio of

  • Illuminance at end of maintenance period to initial illuminance
  • initial illuminance to Illuminance at end of maintenance period
  • Illuminance after maintenance period to initial illuminance
  • Illuminance at end of few lamp failure to initial illuminance

21. Lamp lumen maintenance factor depends on

  • Cleanness of lamp
  • Hours of usage
  • Aging of lamp
  • All the above

22. Diversity in interior lighting is the ratio of

  • Maximum to minimum illuminance
  • Minimum to maximum illuminance
  • Average to maximum illuminance
  • Average to minimum illuminance

23. Rousseau's construction is for finding

  • MHSCP
  • MSCP
  • MHCP
  • MCP

24. MHCP is

  • Mean Hemispherical candle power
  • Mean Horizontal candle power
  • Mean horizontal candle point
  • None of the above

25. Which UGR is most comfortable

  • 40
  • 25
  • 16
  • 13

26. Round each number to the nearest 100. 129

  • 100
  • 200

27. Round each number to the nearest 100. 67

  • 0
  • 100

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

  • 47
  • 45

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

  • Glare
  • Stroboscopic effect
  • Hard shadow
  • Disability glare

30. Round each number to the nearest 100. 443

  • 400
  • 500

31. Write the number in expanded form. 690

  • 600 + 9
  • 600+90

32. Math is...

  • fun :-)
  • the greatest!!
  • Both A & B
  • none of the above

33. Write the number in expanded form. 579

  • 500+70+9
  • 500 + 79

34. Lambert's cosine law is

  • Eθ2 α EmCosθE_{\theta}^2\ \alpha\ \ E_mCos\thetaEθ2​ α Em​Cosθ
  • Eθ α EmCosθE_{\theta}\ \ \alpha\ \ E_mCos\thetaEθ​ α Em​Cosθ
  • Em α EθCosθE_m\ \ \alpha\ \ \ E_{\theta}Cos\thetaEm​ α Eθ​Cosθ
  • Eθ α Cosθ EmE_{\theta}\ \ \alpha\ \frac{\ \ Cos\theta}{\ E_m}Eθ​ α Em​ Cosθ​

35. Round each number to the nearest 100.956

  • 900
  • 1,000

36. Write the number in expanded form. 403

  • 400+3
  • 400 + 30

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.

  • 0.0177
  • 35156.25
  • 0.666
  • 937.5

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

  • E2 α 1d2E^2\ \alpha\ \frac{1}{d^2}E2 α d21​
  • I α 1d2I\ \alpha\ \frac{1}{d^2}I α d21​
  • I2 α 1d2I^2\ \alpha\ \frac{1}{d^2}I2 α d21​
  • I2 α d2I^2\ \alpha\ d^2I2 α d2

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

  • To please customer
  • To increase glare
  • To avoid glare
  • To improve color rendering

40. Round each number to the nearest 100. 349

  • 300
  • 400

41. Round each number to the nearest 100. 258

  • 200
  • 300

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

  • 60, 2049
  • 60, 2046
  • Both A & B
  • none of the above

43. Write the number in expanded form. 742

  • 700+40+2
  • 740 + 2

44. Round each number to the nearest 100. 609

  • 600
  • 700

45. In electromagnetic spectrum the visible light region lies between

  • 380 nm to 800 nm
  • 50 nm to 100 nm
  • 800 nm to 1000 nm
  • below 50 nm

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

  • Violet region
  • Green region
  • Reg region
  • Equal sensitivity in all light region

47. Round each number to the nearest 10. 572

  • 570
  • 580

48. Round each number to the nearest 10. 465

  • 460
  • 470

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

  • 26
  • 24

50. Round each number to the nearest 10. 54

  • 50
  • 60

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