R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation MCQ Question Set 11

Which of the following components need to be added in order to increase the resolution?

1. Ion source
2. Detector
3. Magnetic sector
4. Electric sector

✅ Correct Answer: 4

Which of the following is commonly varied in magnetic deflection mass spectrometer?

1. Electric sector
2. Magnetic fold strength
3. Magnetic constant
4. Electric constant

✅ Correct Answer: 2

Nier-Johnson geometry involves a deflection of which of the following radians in a radial electrostatic field analyser?

1. Π
2. Π/2
3. Π/3
4. Π/4√2

✅ Correct Answer: 2

An accuracy of 1 part in 102 has been obtained in precision mass measurements.

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

✅ Correct Answer: 1

Which of the following is not a component of the time of flight analyser spectrometer?

1. Ion source
2. Field free separation region
3. Electron multiplication region
4. Photo tube

✅ Correct Answer: 4

Time of flight mass spectrometer has an unlimited mass range.

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

✅ Correct Answer: 1

Which of the following is not an advantage of mass spectrometer?

1. Simple
2. Rugged
3. High sensitivity
4. Unlimited mass range

✅ Correct Answer: 3

All the ions entering the tube have the same kinetic energy.

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

✅ Correct Answer: 1

If all the ions have the same kinetic energy how are their masses related to their velocities?

1. Mass and velocity are equal
2. Mass and velocity are not related
3. Mass and velocity are directly proportional
4. Mass and velocity are inversely proportional

✅ Correct Answer: 4

Which of the following is true about time of flight analyser spectrometers?

1. Lighter particles arrive at the detector earlier
2. Heavier particle arrive at the detector earlier
3. Lighter and heavier particles arrive together at the detector
4. Lighter particles do not reach the detector

✅ Correct Answer: 1

In the time of flight mass spectrometer, ions are formed by which of the following methods?

1. Pulsed ionization method
2. Acceleration method
3. Dynamic method
4. Ion excitation method

✅ Correct Answer: 1

The evacuated tube is also known as which of the following?

1. Pulse tube
2. Detector tube
3. Drift tube
4. Acceleration tube

✅ Correct Answer: 3

The current produced by ions arriving at the collector necessitates the use of which of the following?

1. Wide band amplifier
2. Narrow band amplifier
3. Wide band filter
4. Narrow band filter

✅ Correct Answer: 1

Which of the following is an ion optic device in which ions pass through a mirror and their flight is reversed?

1. Reversal device
2. Reflectron
3. Mirror arrangement
4. Separation chamber

✅ Correct Answer: 2

Which of the following statements about mass spectrometers are not true?

1. Time of flight mass spectrometer has the ability to record the entire mass spectrum at a time
2. Time of flight mass spectrometers have poor resolution
3. Conventional spectrometer detects only one peak at a time
4. All spectrometers have the ability to record the entire mass spectrum at a time

✅ Correct Answer: 4

Which of the following is placed just before the detector in a radiofrequency mass spectrometer?

1. Ion source
2. Potential energy selector
3. Ionisation chamber
4. Reflectron

✅ Correct Answer: 2

Which of the following is applied in one or more stages where each stage is a series of three equally spaced parallel grids?

1. Ionisation field
2. Reflection
3. RF field
4. Acceleration tube

✅ Correct Answer: 3

The alternating voltage rf voltage is applied to which of the following?

1. All grids
2. Central grid
3. Alternate grids
4. None of the grids

✅ Correct Answer: 2

The rf spectrometer contains a magnet.

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

✅ Correct Answer: 2

The DC ion accelerating voltage is swept from ______

1. 0 to 50 V
2. 50 to 100 V
3. 200 to 300 V
4. 50 to 250 V

✅ Correct Answer: 4

The resolution of the Bennet tube can be improved by using which of the following?

1. Sine wave rf signal
2. Square wave rf signal
3. Triangular wave rf signal
4. Random signal

✅ Correct Answer: 2

In Bennet spectrometer, the rf voltage has a fixed frequency.

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

✅ Correct Answer: 1

The spurious lines can be reduced to a minimum by using which of the following?

1. Single stage tube
2. Two stage tube
3. Three stage tube
4. Reflectron

✅ Correct Answer: 3

Which of the following is the disadvantage of using three stage tubes?

1. Reduced resolution
2. Bulky construction
3. Complex
4. Heavy

✅ Correct Answer: 1

Which of the following is not the feature of Bennet type spectrometer?

1. Lightweight
2. Simple
3. Absence of spurious lines
4. Moderate resolution

✅ Correct Answer: 3

The resolving power of Bennet type spectrometer is primarily based on which of the following?

1. Distance between detector and reflectron
2. Difference between the individual rf accelerating stages
3. Length of the drift tube
4. Laser beam used

✅ Correct Answer: 2

Which of the following is not a feature of quadrupole mass spectrometer?

1. Low cost
2. Light weight
3. Low speed electronic scanning
4. Simple in construction

✅ Correct Answer: 3

Which of the following is not a component of quadrupole mass filter?

1. Electrodes
2. Choke
3. DC potential
4. Detector

✅ Correct Answer: 4

The mass selection scheme uses a dc potential and not a radio frequency potential.

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

✅ Correct Answer: 2

If to one pair of electrodes one potential with one sign is applied, which of the following is applied to the other pair of electrodes?

1. Same potential with same sign
2. Different potential with same sign
3. Different potential with different sign
4. Same potential with different sign

✅ Correct Answer: 4

Which of the following is the heart of quadrupole instrument?

1. Electrodes
2. Choke
3. DC potential
4. Detector

✅ Correct Answer: 1

Which of the following has to be done to increase the resolution of the quadrupole mass spectrometer?

1. Increasing distance between detector and reflectron
2. Increasing difference between the individual rf accelerating stages
3. Increasing the length of the drift tube
4. Increasing the rod length of the electrode

✅ Correct Answer: 4

Which of the following does not affect the resolution of the instrument?

1. Changing length of electrode
2. Changing slope of scan line
3. Quality of machining of the rods
4. Changing length of drift tube

✅ Correct Answer: 4

In cases where differentiation is required between very similar substances, which of the following techniques making use of quadrupole principle is preferred?

1. Evaporation mass spectrometry
2. Pyrolysis mass spectrometry
3. Plasma mass spectrometry
4. Trapped ion mass spectrometry

✅ Correct Answer: 2

In pyrolysis spectrometry, heating is done until which of the following is reached?

1. Curie point
2. Boiling point
3. Until production of superheated vapour
4. Until 100oC

✅ Correct Answer: 1

Which of the following is used to cool the ion source?

1. Liquid sodium shield
2. Liquid nitrogen shield
3. Water
4. Freon

✅ Correct Answer: 2

In quadrupole mass spectrometer, the ratio u/v is mass dependent, where ‘u’ is the DC voltage and ‘v’ is the peak amplitude.

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

✅ Correct Answer: 2

When a value of q is kept constant, the value of m/e is proportional to which of the following when ‘m’ is the mass number, ‘e’ is the electric charge, ‘u’ is the DC potential, ‘v’ is the peak amplitude and ‘f’ is the frequency?

1. u/v ratio
2. u
3. v
4. four

✅ Correct Answer: 3

Which of the following is not an ion transducer or detector?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Flame ionization detector

✅ Correct Answer: 4

Which of the following is similar to photo multiplier transducer?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 4

Which of the following is used in places where ion currents are very low?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 4

Discrete type electron multiplier transducers can provide current gain upto which of the following?

1. 102
2. 105
3. 107
4. 1011

✅ Correct Answer: 3

Continuous dynode electron multiplier transducer is a trumpet shaped device made with which of the following?

1. Glass doped with lead
2. Steel doped with bronze
3. Phosphor bronze doped with iron
4. Iron doped with calcium

✅ Correct Answer: 1

The potential maintained across the continuous dynode multiplier transducer is which of the following?

1. 1 to 5kV
2. 5 to 10kV
3. 2.5 to 6.2kV
4. 1.8 to 2kV

✅ Correct Answer: 4

Which of the following are not the characteristics of an electron multiplier transducer?

1. Rugged
2. Reliable
3. Microsecond of response time required
4. High current gain

✅ Correct Answer: 3

Which of the following are true about dynodes used in discrete dynode electron multiplier?

1. The dynodes are all kept at same voltage
2. Successive dynodes are held at lower potential
3. Successive dynodes are held at higher potential
4. All dynodes are held at very low potential

✅ Correct Answer: 3

In which of the following detectors, the collector is placed in an inclined manner?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 1

Which of the following is the least sensitive ion detector?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 1

Photographic plates are coated with which of the following?

1. Lead
2. Quartz
3. Silver bromide
4. Mercuric sulphate

✅ Correct Answer: 3

Which of the following detectors are well suited for spark source instruments?

1. Faraday cup collector
2. Photographic plates
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 2

Photographic plates have greater sensitivity and resolution than electron multipliers.

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

✅ Correct Answer: 1

Which of the following detectors consist of an array of glass capillaries?

1. Faraday cup collector
2. Photographic plates
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 3

Which of the following detectors can be used for ions with short life time?

1. Faraday cup collector
2. Photographic plates
3. Micro-channel plate
4. Electron multiplier transducer

✅ Correct Answer: 2

ICP’s principle is similar to which of the following?

1. Flame emission spectroscopy
2. Fourier transforms spectroscopy
3. Atomic emission spectroscopy
4. Absorption spectroscopy

✅ Correct Answer: 3

ICP is used to analyse samples in which of the following states?

1. Solids
2. Liquids
3. Gases
4. Solids and liquids

✅ Correct Answer: 4

Solid samples are introduced into the ICP spectrometer using which of the following?

1. Nebulizer
2. Curvette having glass windows
3. Probe
4. Laser ablation system

✅ Correct Answer: 4

Liquid samples are introduced into the ICP spectrometer using which of the following?

1. Nebulizer
2. Curvette having glass windows
3. Probe
4. Laser ablation system

✅ Correct Answer: 1

Atomisation or ionisation occurs at which of the following conditions?

1. Vacuum pressure
2. Atmospheric pressure
3. Low pressure
4. High pressure

✅ Correct Answer: 4

Ions flow is pumped into the vacuum system using which of the following?

1. Orifice
2. Nozzle
3. Venturi meter
4. Dall tube

✅ Correct Answer: 1

Which of the following is not the characteristic of ICP spectrometer?

1. Easy sample introduction
2. It can trace multiple elements
3. High detection limits
4. Accurate

✅ Correct Answer: 3

ICP spectrometer is a sequential multi-element analyser that has scan times less than ____ for one sweep.

1. 10ms
2. 20ms
3. 50ms
4. 100ms

✅ Correct Answer: 2

Double focussing section analysers offer better resolution than ICP spectrometry system.

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

✅ Correct Answer: 1

The most common type of ion detector found in ICP system is which of the following?

1. Faraday cup collector
2. Channeltron
3. Micro-channel plate
4. Flame ionization detector

✅ Correct Answer: 2

Which of the following is the most accurate method of determination of elemental composition?

1. Spectroscopy
2. Isotope dilution
3. Isobar dilution
4. Chromatography

✅ Correct Answer: 2

Which of the following is the disadvantage of ICP mass spectroscopy?

1. Incapable of multi-element analysis
2. Less sensitivity
3. Impossible to obtain isotopic information
4. Not useful for detection of non-metals

✅ Correct Answer: 4

The isobaric interference is not caused in which of the following elements?

1. Argon
2. Oxygen
3. Helium
4. nitrogen

✅ Correct Answer: 3

Which of the following is the most sensitive of the spectral methods?

1. Absorption spectroscopy
2. Mass spectroscopy
3. Flame emission spectroscopy
4. Atomic emission spectroscopy

✅ Correct Answer: 2

Which of the following is the disadvantage of gas chromatography?

1. It is not a good method
2. It cannot be used for qualitative analysis
3. It cannot be used for the separation of volatile components
4. It does not provide direct identification

✅ Correct Answer: 4

Cold tray is provided for liquid N2 or CO2 but is used only for extremely small samples.

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

✅ Correct Answer: 1

Which of the following is most often used in the chromatograph in gas chromatograph MS?

1. Curvette
2. Paper support
3. Capillary tube
4. Flask

✅ Correct Answer: 3