R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation MCQ Question Set 7

The zero stability of vibrating condenser amplifier type pH meter is much better than a direct coupled amplifier.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?

1. Frequency of the vibrator should be stable
2. Frequency of the vibrator should be constant
3. Amplitude of the vibrator should be constant
4. Both frequency and amplitude of the vibrator should be constant and stable

✅ Correct Answer: 4

If an instrument fails to balance at zero, it is most likely that the electrodes are defective.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Which of the following is not the characteristic of ion selective electrodes?

1. It is fragile
2. Easy to use
3. Available in different sizes and shapes
4. It is insensitive to many ions

✅ Correct Answer: 1

In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?

1. Sodium
2. Hydrogen
3. Nitrogen
4. Chlorine

✅ Correct Answer: 1

In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _______

1. Solid material
2. Semi-permeable membrane
3. Hydrophobic material
4. Water absorbing material

✅ Correct Answer: 3

In recent liquid membrane electrodes, the porous liquid membrane is replaced with which of the following?

1. Polyvinyl chloride
2. Polyacryl chloride
3. Polyester membrane
4. Polyacryl amide

✅ Correct Answer: 1

Which of the following is used in potassium electrode in liquid membrane electrodes?

1. Ionomycin
2. Valinomycin
3. Nonactin
4. Gramicidin

✅ Correct Answer: 2

In solid state membranes, the body of the electrodes are made of which of the following?

1. Polyvinyl chloride
2. Plastic
3. Polythene
4. Teflon

✅ Correct Answer: 4

Ion selective electrode are unaffected by colour or turbidity of the solution.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following is not a problem of ion selective electrodes?

1. Interference with other ions
2. Output is influences by ionic strength
3. Drift in electrode potential during a sequence of measurements
4. Can measure only positive ions

✅ Correct Answer: 4

Which of the following is the effective concentration measured at the electrode head?

1. Selectivity coefficient
2. Ionic strength
3. Activity
4. Activity coefficient

✅ Correct Answer: 3

The value of activity coefficient is always in which of the following ranges?

1. Zero
2. Less than zero
3. Less than 1
4. Greater than 1

✅ Correct Answer: 3

Which of the following specifies the relation between ionic strength and activity coefficient?

1. Directly proportional
2. Inversely proportional
3. Equal
4. No particular relation

✅ Correct Answer: 2

The difference between measured activity and actual concentration becomes higher at higher concentration. Is this statement true or false?

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Ion selective electrodes have ________ linear range and _________ detection limit than the pH electrode.

1. Lower, lower
2. Lower, higher
3. Lower, higher
4. Higher, higher

✅ Correct Answer: 2

In Ammonia electrode, diffusion of dissolved ammonia occurs through the membrane until which of the following conditions occur?

1. Concentration becomes equal on both sides
2. Activity becomes equal on both sides
3. Partial pressure becomes equal on both sides
4. Differential pressure is low

✅ Correct Answer: 3

When electrode potential response is plotted as a function of ammonia concentration on a semi-log graph, the graph obtained will be ________

1. A straight line
2. Parabolic
3. Sigmoidal
4. A curve

✅ Correct Answer: 1

How can samples above 1M in ammonia concentration be measured using ammonia electrode?

1. It must be diluted and measured
2. It cannot be measured
3. The electrode has to be modified for measuring
4. It can be measured directly

✅ Correct Answer: 1

The dilution of solution must not reduce the level of ammonia below _________

1. 10-2 M
2. 10-5 M
3. 10-8 M
4. 10-9 M

✅ Correct Answer: 2

Which of the following factors does not the reproducibility of the ammonia electrode?

1. Temperature
2. Drift
3. Noise
4. Dilution

✅ Correct Answer: 4

The performance of ammonia electrode is not affected by sample colour and turbidity.

1. True
2. FALSE
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

In fluoride ion electrode, the potential corresponding to level of the fluoride ion is described by which of the following equations when E is the measured electrode potential, Eo is the reference potential and A is the level of fluoride ions in solution?

1. E=Eo+0.0591 log A
2. E=Eo-0.0591 log A
3. E=Eo+0.0896 log A
4. E=Eo-0.0896 log A

✅ Correct Answer: 2

What does TISAB which is used to overcome interferences stand for?

1. Total Isolation Strength Absolute Buffer
2. Total Ionic Strength Absolute Buffer
3. Total Ionic Strength Adjustment Buffer
4. Total Isolation Strength Adjustment Buffer

✅ Correct Answer: 3

Which of the following causes main interference in Fluoride electrode?

1. H+ ions
2. OH– ions
3. Li+ ions
4. Cl– ions

✅ Correct Answer: 2

Crystal membrane of ion selective electrode can be regenerated by washing with which of the following?

1. Alcohol
2. Iodine solution
3. Acidic solution
4. Basic solution

✅ Correct Answer: 1

For fluoride electrode, the electrode response curve will not only shift but will change slope with changes in temperature.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following gas permeable membrane is used for ammonia gas sensing electrode?

1. Silicon rubber
2. Microporous Teflon membrane
3. Fluorocarbon
4. Polythene

✅ Correct Answer: 3

Which of the following gas permeable membrane is used for carbon dioxide gas sensing electrode?

1. Silicon rubber
2. PVC membrane
3. Fluorocarbon
4. Polythene

✅ Correct Answer: 1

The response time of the biocatalytic membrane electrode is poor when used with complex organic molecules.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following reference electrode is placed in the solution of carbon dioxide electrode?

1. Calomel electrode
2. Silver/silver chloride electrode
3. Mercury/mercury sulphate electrode
4. Glass electrode

✅ Correct Answer: 2

Biocatalytic membrane electrode cannot be used for the measurement of which of the following gases?

1. Ammonia
2. Carbon dioxide
3. Hydrogen
4. nitrogen

✅ Correct Answer: 4

The biocatalytic membrane used in the ammonia selective electrode is which of the following?

1. Urea
2. Urease
3. Acrylamide
4. Polyacrylamide

✅ Correct Answer: 2

Which of the following materials are used as a gel to which biocatalytic membrane is fixed in ammonia selective electrode?

1. Urea
2. Urease
3. Acrylamide
4. Polyacrylamide

✅ Correct Answer: 3

The biocatalytic membrane is attached to the glass electrode using which of the following materials?

1. Nylon mesh
2. Teflon
3. Silicon rubber
4. Polythene

✅ Correct Answer: 1

The response time of the biocatalytic electrode is a function of the thickness of the enzyme layer.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

In carbon dioxide electrode, the membrane separates which of the following?

1. Sodium carbonate, magnesium chloride
2. Magnesium hydrogen carbonate, sodium chloride
3. Sodium hydrogen carbonate, sodium chloride
4. Magnesium carbonate, magnesium chloride

✅ Correct Answer: 2

If a solid or liquid membrane is placed in pure water, the membrane dissolves slightly, producing an equilibrium concentration of the measured ion. This is represented as ______

1. A constant, Eo
2. Activity
3. Blank correction, Cb
4. Concentration of standard solution, Cs

✅ Correct Answer: 3

During which of the following conditions is the blank correction not necessary?

1. If sample concentration rises in linear response region
2. If sample concentration falls in linear response region
3. If sample concentration rises in non-linear response region
4. If sample concentration falls in non-linear response region

✅ Correct Answer: 2

During which of the following conditions is the blank correction necessary?

1. If sample concentration rises in linear response region
2. If sample concentration falls in linear response region
3. If sample concentration rises in non-linear response region
4. If sample concentration falls in non-linear response region

✅ Correct Answer: 4

Ion analysers need calibration once in which of the following durations?

1. Every two or three hours
2. Every nine or ten hours
3. Every 24 hours
4. Every 48 hours

✅ Correct Answer: 1

In ion analysers, which of the following serve the dual purpose of controlling the operating current of FET and providing current gain?

1. FET itself does it
2. SCR
3. Op-amp
4. Diode

✅ Correct Answer: 3

The presence of dirt or moisture degrades which of the following?

1. Circuit components
2. High input impedance of buffer amplifier
3. Low input impedance of buffer amplifier
4. Low output impedance of buffer amplifier

✅ Correct Answer: 2

Which of the following is not a type of ground in ion analyser?

1. Chassis and electrostatic ground
2. Digital ground
3. Analog ground
4. Reference ground

✅ Correct Answer: 4

The timing for a microprocessor and for all signals is generated by the CPU clock.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following is the only operator entry required in PC-based ion analysers?

1. Hardware set-up
2. Signal measurement
3. Calibration
4. Sample calculation

✅ Correct Answer: 3

The analog and digital grounds are connected together in ion analysers.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Which of the following is not a characteristic of the immobilized enzymes?

1. They cannot be re-used
2. It produces reproducible results
3. Stability exists
4. Same catalytic activity is present for number of analysis

✅ Correct Answer: 1

Which of the following is the physico-chemical component?

1. Enzymes
2. Anti-bodies
3. Transducer
4. Cells or tissues

✅ Correct Answer: 3

An example of biosensor, urea electrode makes use of which of the following electrodes?

1. Carbon dioxide electrode
2. Ammonia electrode
3. Fluoride electrode
4. Ammonium electrode

✅ Correct Answer: 4