Questions and answers for exam Preparation

MCQs

Total Questions : 100 | Page 5 of 10 pages

Question 41. How is NO converted to NO₂ for analysis in UV and Visible analyzers?

Treating sample gas with pressurized oxygen
Treating sample gas with ozone
Treating sample gas with oxygen at low pressure
Treating sample gas with water at high pressure

Discuss Question

Answer: Option A. -> Treating sample gas with pressurized oxygen
Answer: (a).Treating sample gas with pressurized oxygen

Question 42. The instruments based on chemiluminescence maintain linearity in which of the following ranges?

1ppb to 100ppb
100ppb to 1000ppb
1ppb to 1000ppb
100ppb to 1000ppb

Discuss Question

Answer: Option C. -> 1ppb to 1000ppb
Answer: (c).1ppb to 1000ppb

Question 43. During analysis of NO₂ using Chemiluminescent analyser, why is NO₂ not made to react with ozone directly?

Less accuracy
It is a slow process
It leads to contamination of the sample
It does not produce luminescence

Discuss Question

Answer: Option B. -> It is a slow process
Answer: (b).It is a slow process

Question 44. How is NO converted to NO₂ for analysis in Chemiluminescent analyser?

Treating sample gas with pressurized oxygen
Treating sample gas with ozone
Treating sample gas with oxygen at low pressure
Treating sample gas with water at high pressure

Discuss Question

Answer: Option B. -> Treating sample gas with ozone
Answer: (b).Treating sample gas with ozone

Question 45. How can absorption be enhanced while determining NO concentration using CO laser?

By converting NO into NO₂
By placing NO in a magnetic field
By using proper monochromators
By using choppers

Discuss Question

Answer: Option B. -> By placing NO in a magnetic field
Answer: (b).By placing NO in a magnetic field

Question 46. Which of the following measuring technique is utilized for measuring nitrogen?

By using a method based on gas density
By using paramagnetic analyzers
By using magnetic wind instruments
By using a photospectrometer where a gas sample is analysed and detected with a photocell

Discuss Question

Answer: Option D. -> By using a photospectrometer where a gas sample is analysed and detected with a photocell
Answer: (d).By using a photospectrometer where a gas sample is analysed and detected with a photocell

Question 47. Gases emit radiation under which of the following conditions which can be used for determination of gases?

When mixed with other gases
When kept at suitable temperature
With sufficient electrical excitation and at suitable pressures
When exposed to radiation

Discuss Question

Answer: Option C. -> With sufficient electrical excitation and at suitable pressures
Answer: (c).With sufficient electrical excitation and at suitable pressures

Question 48. When hot-wires are used as detectors amplification is not required.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option B. -> False
Answer: (b).False

Question 49. Which of the following is the effective sample volume in analyzers based on gas density?

10 ml
20 ml
5 ml
50 ml

Discuss Question

Answer: Option C. -> 5 ml
Answer: (c).5 ml

Question 50. The characteristic emission of which colour, when discharge takes place in a low pressure chamber containing gas sample, will indicate the presence of nitrogen while using photospectrometer?