Analytical instruments MCQ Quiz Hub

1. Which of the following is the wavelength at which CO laser operates?
1.005 µm
5.307 µm
4.952 µm
6.179 µm

2. CO laser is operated at liquid nitrogen temperature.
True
False
all of the above
None of the mentioned

3. The chemiluminescence reactor with ozonator is specific to which of the following compounds?
N2
NO
NO2
N2O

4. In which of the following ways can chemiluminescence occur in compounds of nitrogen?
When NO2 returns to ground state from excited state
When NO reacts with oxygen
When NO reacts with ozone
When NO2 is reduced to NO

5. West-Gaeke colorimetric method is used to analyse oxides of nitrogen
True
False
all of the above
None of the mentioned

6. Which of the following methods cannot be used for the estimation of hydrocarbons?
Mass spectroscopy
Chemiluminescence method
Ultraviolet absorption
Gas chromatography

7. Which of the following is the most abundant hydrocarbon which is emitted into the atmosphere by biological activity?
Ethane
Methane
Poly Aromatic hydrocarbons
Pentane

8. Flame ionization detectors are sensitive to which of the following gases?
Carbon dioxide
Methane
Carbon monoxide
Sulphur dioxide

9. How can carbon monoxide be detected using flame ionization detectors while using gas chromatography technique?
By converting it into carbon dioxide
By converting it into methane
By mixing it with combustible gases
It cannot be detected

10. Which of the following organic compounds will have the highest intensity of response when introduced in a flame ionization detector?
Methane
Ethane
Propane
Butane

11. Propane would give three times the intensity of response as compared to methane.
True
False
all of the above
None of the mentioned

12. In flame ionization detectors, which of the following is the range adequate for atmospheric sampling?
0-1 ppm
0-2 ppm
0-20 ppm
0-100 ppm

13. Which of the following methods make use of pyrolysis while used for detecting methane?
Mass spectroscopy
Flame ionization detector
Ultraviolet absorption
Gas chromatography

14. In flame ionization detector, the ions collected on the negatively charged grid are amplified at the high impedance amplifier.
True
False
all of the above
None of the mentioned

15. Which of the following is not the characteristic of flame ionization detector?
Good linearity
Narrow range of concentration
High sensitivity
Fast response

16. Which of the following is the formula for pH calculation?
log10[H+]
-log10[H+]
log2[H+]
-log2[H+]

17. Pure water is known to be which of the following?
Weak electrolyte
Strong electrolyte
Neither weak nor strong
Not an electrolyte

18. Which of the following is the value of hydrogen ion concentration of pure water?
1×107 moles/litre
1×105 moles/litre
1×106 moles/litre
1×108 moles/litre

19. Which of the following is the relation between hydrogen and hydroxyl ion concentration of pure water?
Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

20. The Nernst equation is given by which of the following statements?
E=Eo + 2.303 RT/F log CH
E=Eo – 2.303 RT/F log CH
E=Eo + 2.303 RT×F log CH
E=Eo – 2.303 RT×F log CH

21. Which of the following is the relation between the concentration of hydrogen and hydroxyl ions in an acidic solution?
Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

22. Which of the following is the relation between the concentration of hydrogen and hydroxyl ions in a basic solution?
Value of hydrogen ion concentration is greater
Value of hydroxyl ion concentration is greater
They are both always the same
The concentrations keep changing

23. The measurement of hydrogen ion concentration can be made by measuring the potential developed in an electrochemical cell.
True
False
all of the above
None of the mentioned

24. Slope factor is independent of temperature.
True
False
all of the above
None of the mentioned

25. Which of the following is not the characteristic of a reference electrode?
It must have a known output potential
It must have a constant output potential
Its output potential is dependent on the composition of the solution
It is employed in conjunction with the indicator or working electrode

26. Why is Standard hydrogen electrode called as the primary reference electrode?
It has a known output potential
It has a constant output potential
Its output potential is independent of the composition of the solution
Its output potential is zero volts

27. Which of the following is the simple and most convenient hydrogen electrode?
Pascal Hydrogen electrode
Bourne Hydrogen electrode
Hilderbant Hydrogen electrode
West Hydrogen electrode

28. Which of the following is not the disadvantage of hydrogen electrode?
Platinum can be easily poisoned
Presence of oxidising agents alters the potential
It gives a salt error
H2 gas at 1 atmospheric pressure is difficult to set up and transport

29. In Hydrogen electrode, the electrode is placed in a solution of ____ M Hcl. Fill in the blank.
0.5
1
2
3

30. Hydrogen electrode which is the reference electrode can be used as which of the following?
Anode only
Cathode only
Anode or Cathode
Salt bridge

31. What is the drawback that occurs in using ion exchange chromatography on sulphonated polystyrene resin and colourimetry for amino-acid analysis?
Less accuracy
Low resolution
Inconvenient to handle many individual samples
Slow in operation

32. Which one of the following methods is the most suitable for amino-acid analysis?
Gas chromatography
Ion exchange chromatography
Paper electrophoresis
Resin column chromatography

33. Which of the following colour reagents are used in Resin column chromatography?
Marquis reagent
Benedict reagent
Ninhydrin
Nessler’s reagent

34. Which of the following amino-acids is measured at a wavelength of 440nm using photometric systems?
Proline
Alanine
Glutamine
Valine

35. In Automatic amino-acid analyzer, the sample containing ___________ of each amino compound is introduced at the top of the ion exchange column.
1 to 10 µmoles
1 to 10 moles
0.05 to 2 moles
0.05 to 2 µmoles

36. Which of the following cannot be analysed using resin column chromatography?
Peptides
Amines
Amino compounds
Components which are ninhydrin negative

37. Trapped air in pumps of Automatic amino-acid analyzer is eliminated using which of the following ways?
Suction pump
De-aerator
Overcome naturally by pump pressure
Using pulse damper

38. Amino-acids are distinguishable from each other only by one or two atoms in their structure.
True
False
all of the above
None of the mentioned

39. What is the drawback that occurs in using gas chromatography for amino-acid analysis?
Costly
Cannot be used for proteins or polypeptides
Slow process
Complex in operation

40. Resin column chromatography does not involve breaking of bonds in amino-acids.
True
False
all of the above
None of the mentioned

41. pH meters can be considered as voltage sources with which of the following internal resistances?
Very low resistance
Moderate resistance
Very high resistance
ValidationSummary

42. The electrodes used in pH measurement have which of the following internal resistances?
Very low resistance
Moderate resistance
Very high resistance
No resistance

43. Which of the following is not a failure in pH meters?
Defective electrodes
Defective input circuitry
Defective electronic circuitry
Defective calibration

44. Which of the following is the simplest of pH meters?
Null-detector type pH meter
Direct reading type pH meter
Digital pH meter
Modern pH meter

45. In which of the following ways can zero drift be reduced in pH meters?
Using filter
Giving zero adjustment arrangement
Keeping the input impedance high
Using balanced and differential amplifiers

46. Which of the following can be used to provide automatic temperature compensation?
Proper insulation
Calibration for different temperatures
Thermistor
Thermometer

47. Which of the following is not the characteristic of null-detector type pH meter?
It can be battery operated
It has less accuracy
It is easy to maintain
Its electronic circuits are simple

48. Which of the following is not the characteristic of direct reading type pH meters?
Simple operation
Quick to use
Continuous indication output
It requires balancing process

49. Which of the following is not the characteristic of chopper amplifier pH meter?
Direct voltage from the electrodes is chopped at the main frequency
Using choppers for high-input resistance gives rise to spikes of waveforms at the output
It leads to stability in DC output of phase-sensitive rectifier
Magnitude of surge increases in the glass electrode output

50. In which of the following ways can the disadvantages of chopper amplifier type pH meter be overcome?
Using zero corrected DC amplifier
Using modern design
Using digital design
Using vibrating condenser