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General Knowledge > General Science

PHOTOMETRY MCQs

Total Questions : 19 | Page 2 of 2 pages
Question 11. In Flame emission photometers, the measurement of _____________ is used for quantitative analysis
  1.    Intensity
  2.    Colour
  3.    Frequency
  4.    Velocity
 Discuss Question
Answer: Option A. -> Intensity
Question 12. At a height of one meter above the centre of a circular table of diameter 4m, a bulb of 100 W hangs
  1.    2√5Io
  2.    5√5Io
  3.    2Io
  4.    None of these
 Discuss Question
Answer: Option B. -> 5√5Io
Question 13. Which of the following is not an application of Flame emission photometers?
  1.    Analysis of biological fluids
  2.    Analysis of complex mixtures
  3.    Determination of metals such as Mn, Cu
  4.    Determination of sodium, potassium in soil
 Discuss Question
Answer: Option B. -> Analysis of complex mixtures
Question 14. What is the power of the lamp if its luminous efficiency is 2 lumen/watt and its luminous intensity is 42 candela?
  1.    62 W
  2.    78 W
  3.    128 W
  4.    264 W
 Discuss Question
Answer: Option D. -> 264 W
Question 15. Which of the following has more luminous efficiency?
  1.    40 W bulb
  2.    40 W fluorescent tube
  3.    100 W bulb
  4.    None of these
 Discuss Question
Answer: Option B. -> 40 W fluorescent tube
Question 16. A point source of 100 candela is held 5 m above a sheet of blotting paper which reflects 75% of the incident light
  1.    3 lux
  2.    3 phot
  3.    4 lux
  4.    4 phot
 Discuss Question
Answer: Option C. -> 4 lux
Question 17. A lamp hangs at a height of 4 m above a table
  1.    92%
  2.    40%
  3.    64%
  4.    78%
 Discuss Question
Answer: Option D. -> 78%
Question 18. Lux is equivalent to which of the following?
  1.    1 lumen/cm2
  2.    1 lumen/m2
  3.    1 candela/cm2
  4.    1 candela/m2
 Discuss Question
Answer: Option D. -> 1 candela/m2
Question 19. Which of the following sources of light is the inverse square law valid for?
  1.    Cylindrical source
  2.    Isotropic point source
  3.    Searchlight
  4.    None of these
 Discuss Question
Answer: Option B. -> Isotropic point source

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