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Multiple Choice Question (MCQ) of Illumination page-2


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11. Candela is the unit of

A) Luminous intensity
B) Luminous flux
C) Wavelength
D) None of the above.

Ans : (A)


12. The unit luminous flux is

A) lux
B) lumen
C) candela
D) steradian.

Ans : (B)


13. For the same wastage which lamp is cheapest ?

A) Sodium vapour
B) Mercury vapour lamp
C) Fluorescent tube
D) GLS lamps.

Ans : (D)


14. Optical instruments used for the comparison of candle powers of different sources are known as

A) Photo meter
B) Bunsen meter
C) Radio meters
D) Candle meters.

Ans : (A)


15. The illumination is directly proportional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux. Above statement is associated with

A) Planck’s law
B) Macbeth’s law of illumination
C) Bunsen’s law of illumination
D) Lambert,s cosine law.

Ans : (D)


16. Which photometer is used for comparing the light of different colours ?

A) Lummer Brodhum photometer
B) Guilds Flicker photometer
C) Grease spot photometer
D) Bunsen photometer.

Ans : (B)


17. Which photometer depends for its operation on Lambert’s cosine law ?

A) Guild’s Flicker Photometer
B) Lummer Brodhum Photometer
C) Trotter Illumination Photometer
D) Macbeth Illumino meter.

Ans : (C)


18. Illumination level required for precision work is around

A) 50 lm/m2
B) 100 lm/m2
C) 200 lm/m2
D) 500 lm/m2.

Ans : (D)


19. Which of the following is not a standard wattage of incandescent lamps in India ?

A) 15 W
B) 25 W
C) 40 W
D) 50 W.

Ans : (D)


20. Light is produced in electric discharge lamps by

A) carbon electrodes
B) ionization in a gas or vapour
C) magnetic effect of current
D) heating effect of current.

Ans : (B)



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