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MCQs

Total Questions : 50 | Page 1 of 5 pages
Question 1. The output of a tungsten filament lamp depends on
  1.    size of lamp
  2.    size of shell
  3.    temperature of filament
  4.    all of the above
 Discuss Question
Answer: Option C. -> temperature of filament


temperature of filament


Question 2. Which gas is sometimes used in filament lamps ?
  1.    Argon
  2.    Krypton
  3.    Nitrogen
  4.    Carbon dioxide
 Discuss Question
Answer: Option A. -> Argon


Argon


Question 3. Which bulb operates on lowest power ?
  1.    Night bulb
  2.    Neon bulb
  3.    GLS bulb
  4.    Torch bulb
 Discuss Question
Answer: Option D. -> Torch bulb


Torch bulb


Question 4. Melting temperature of tungsten is
  1.    2000°K
  2.    2500°K
  3.    2655°K
  4.    3655°K
 Discuss Question
Answer: Option D. -> 3655°K


3655°K


Question 5. A zero watt lamp consumes
  1.    no power
  2.    about 5 to 7 W power
  3.    about 15 to W power
  4.    about 25 to 30 W power
 Discuss Question
Answer: Option B. -> about 5 to 7 W power


about 5 to 7 W power


Question 6. Candela is-the unit for
  1.    Light flux
  2.    Luminous intensity
  3.    Brightness
  4.    Luminous efficiency
 Discuss Question
Answer: Option B. -> Luminous intensity


Luminous intensity


Question 7. Which photometer depends for its operation on Inverse Square Law ?
  1.    Guilds Flicker Photometer
  2.    Lummer Brodhum Photometer
  3.    Macbeth llluminometer
  4.    Trotter Illumination Photometer
 Discuss Question
Answer: Option C. -> Macbeth llluminometer


Macbeth llluminometer


Question 8. Light is produced in electric discharge lamps by
  1.    heating effect of current
  2.    magnetic effect of current
  3.    ionization in a gas or vapor
  4.    carbon electrodes
 Discuss Question
Answer: Option C. -> ionization in a gas or vapor


ionization in a gas or vapor


Question 9. The color temperature of day light is around
  1.    50 K
  2.    160 K
  3.    600 K
  4.    6000 K
 Discuss Question
Answer: Option D. -> 6000 K


6000 K


Question 10. Lumen/watt is the unit of
  1.    Light flux
  2.    Luminous intensity
  3.    Brightness
  4.    Luminous efficiency
 Discuss Question
Answer: Option D. -> Luminous efficiency


Luminous efficiency


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