132 + Interview Questions in Mass Spectrometer in Analytical Instrumentation Page 2 InterviewSolution

51.	Time of flight mass spectrometer has an unlimited mass range.(a) True(b) FalseThe question was posed to me in an online interview.I'd like to ask this question from Time of Flight Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (a) True Best EXPLANATION: Time of flight mass spectrometer is a type of mass spectrometer. It has unlimited mass RANGE.

Discussion

52.	In the time of flight mass spectrometer, ions are formed by which of the following methods?(a) Pulsed ionization method(b) Acceleration method(c) Dynamic method(d) Ion excitation methodI have been asked this question in an interview for internship.This interesting question is from Time of Flight Mass Spectrometer in division Mass Spectrometer of Analytical Instrumentation
Answer» The correct answer is (a) Pulsed ionization method The best EXPLANATION: In the time of FLIGHT MASS spectrometer, IONS are formed by pulsed ionisation method. It is a type of mass spectrometer.

Discussion

53.	All the ions entering the tube have the same kinetic energy.(a) True(b) FalseThis question was addressed to me in an online interview.This is a very interesting question from Time of Flight Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation
Answer» Right choice is (a) True To explain I would SAY: Separation of ions OCCURS while they are moving from the ion source to the detector. All the ions ENTERING the TUBE have the same kinetic energy.

Discussion

54.	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?(a) u/v ratio(b) u(c) v(d) fThe question was asked by my college professor while I was bunking the class.This question is from Quadrupole Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» Correct option is (c) v For explanation I would say: When a value of q is KEPT constant, the value of m/e is PROPORTIONAL to ‘v’. By variation of RF amplitude the m/e ratio VARIES.

Discussion

55.	The potential maintained across the continuous dynode multiplier transducer is which of the following?(a) 1 to 5kV(b) 5 to 10kV(c) 2.5 to 6.2kV(d) 1.8 to 2kVThis question was posed to me during an online exam.Question is from Ion Transducers topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» The correct CHOICE is (d) 1.8 to 2kV The explanation: The potential MAINTAINED across the continuous DYNODE multiplier transducer is 1.8 to 2kV. Electrons CASCADE down the TUBE.

Discussion

56.	Photographic plates have greater sensitivity and resolution than electron multipliers.(a) True(b) FalseI had been asked this question in a national level competition.I need to ask this question from Ion Transducers in portion Mass Spectrometer of Analytical Instrumentation
Answer» Correct option is (a) True Easiest explanation: Photographic plates have greater sensitivity and RESOLUTION than electron MULTIPLIERS. This is because they INTEGRATE the ion SIGNALS over a period of time.

Discussion

57.	Liquid samples are introduced into the ICP spectrometer using which of the following?(a) Nebulizer(b) Curvette having glass windows(c) Probe(d) Laser ablation systemThe question was posed to me by my college director while I was bunking the class.The above asked question is from Inductively Coupled Plasma Mass Spectrometer in division Mass Spectrometer of Analytical Instrumentation
Answer» The CORRECT choice is (a) Nebulizer The explanation: ICP spectrometer can be USED for liquid samples. Aqueous samples are INTRODUCED using the nebulizer.

Discussion

58.	The gas burden from conventional LC flow rates creates nearly _____ times more gas than cryo-pumped vacuum system can handle.(a) 5(b) 10(c) 20(d) 40I had been asked this question during an online interview.Asked question is from Liquid Chromatograph- Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT CHOICE is (C) 20 The BEST I can explain: The gas burden from CONVENTIONAL LC flow rates creates nearly 20 times more gas than cryo-pumped vacuum system can handle.

Discussion

59.	Mass analyser is similar to which of the following in optical spectrometer?(a) Source(b) Monochromator(c) Detector(d) SampleThe question was asked in an interview for job.This question is from Components of Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» The correct choice is (b) MONOCHROMATOR Explanation: Mass analyser is similar to monochromator in an OPTICAL spectrometer. It separates IONS ACCORDING to their mass/charge ratio.

Discussion

60.	An accuracy of 1 part in 10^2 has been obtained in precision mass measurements.(a) True(b) FalseThe question was asked during an interview.My query is from Magnetic Deflection Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» Correct answer is (B) False To explain I would say: An accuracy of 1 part in 10^9 has been obtained in precision MASS measurements. SPECTROGRAPHS with photographic reading are used for analysis of SOLIDS.

Discussion

61.	Which of the following is used to inject liquid samples?(a) Hypodermic needle(b) Glass bulb(c) Capillary tube(d) CurvetteI had been asked this question by my college director while I was bunking the class.This key question is from Components of Mass Spectrometer topic in division Mass Spectrometer of Analytical Instrumentation
Answer» The correct OPTION is (a) Hypodermic needle Easiest EXPLANATION: Liquid samples are injected through hypodermic NEEDLES. It is vaporized at LOW PRESSURE.

Discussion

62.	Which of the following is not a component of the time of flight analyser spectrometer?(a) Ion source(b) Field free separation region(c) Electron multiplication region(d) Photo tubeI got this question in quiz.My query is from Time of Flight Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» The CORRECT option is (d) Photo tube To explain: PHOTOTUBE is not a COMPONENT of time of FLIGHT mass spectrometer. Time of flight mass analyser is a type of mass spectrometer.

Discussion

63.	Which of the following statements about mass spectrometers are not true?(a) Time of flight mass spectrometer has the ability to record the entire mass spectrum at a time(b) Time of flight mass spectrometers have poor resolution(c) Conventional spectrometer detects only one peak at a time(d) All spectrometers have the ability to record the entire mass spectrum at a timeThis question was posed to me in final exam.My question comes from Time of Flight Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (d) All SPECTROMETERS have the ability to record the entire mass spectrum at a time To explain I WOULD SAY: CONVENTIONAL spectrometer detects only one peak at a time. Time of flight mass spectrometer has the ability to record the entire mass spectrum at a time.

Discussion

64.	The spurious lines can be reduced to a minimum by using which of the following?(a) Single stage tube(b) Two stage tube(c) Three stage tube(d) ReflectronThe question was asked in unit test.This is a very interesting question from Radiofrequency Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (C) Three stage tube Easy explanation: The SPURIOUS lines can be reduced to a minimum by using three stage tubes. TWO stage tubes tend to PRODUCE spurious lines.

Discussion

65.	Which of the following is used in places where ion currents are very low?(a) Faraday cup collector(b) Channeltron(c) Micro-channel plate(d) Electron multiplier transducerI had been asked this question during an interview.I want to ask this question from Ion Transducers topic in section Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (d) ELECTRON multiplier transducer Easy EXPLANATION: Electron multiplier transducer is USED in places where ion CURRENTS are very LOW. Its primary cathode detects ions.

Discussion

66.	Discrete type electron multiplier transducers can provide current gain upto which of the following?(a) 10^2(b) 10^5(c) 10^7(d) 10^11This question was posed to me in class test.This interesting question is from Ion Transducers topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» Right option is (c) 10^7 Explanation: DISCRETE TYPE electron multiplier transducers can provide CURRENT gain upto 10^2. Upto 20 dynodes need to be USED for this purpose.

Discussion

67.	Which of the following detectors are well suited for spark source instruments?(a) Faraday cup collector(b) Photographic plates(c) Micro-channel plate(d) Electron multiplier transducerI had been asked this question during an interview.The above asked question is from Ion Transducers in division Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (b) Photographic plates Explanation: Photographic plates are WELL suited for SPARK source INSTRUMENTS. It has GREAT sensitivity.

Discussion

68.	The mass-selected ions are activated in which of the following ways that cause them to fall apart to produce product ions?(a) Collisional activation(b) Evaporational activation(c) Inert gas activation(d) Thermal activationThe question was posed to me during an online exam.This intriguing question comes from Tandem Mass Spectroscopy in section Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (a) Collisional activation The explanation: The mass-selected ions are activated by some MEANS that cause them to FALL apart to PRODUCE PRODUCT ions. They are activated by collisional activation.

Discussion

69.	Given below is the diagram of the drift tube of a tandem quadrupole/time of flight instrument. Identify the unmarked component.(a) Nebuliser(b) Filter(c) Chopper(d) Acceleration lensThe question was posed to me during an online exam.This intriguing question comes from Tandem Mass Spectroscopy topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (d) Acceleration lens The BEST I can EXPLAIN: The unmarked COMPONENT is acceleration lens. A collision cell is located before the acceleration lens.

Discussion

70.	Which of the following is not a characteristic of nebulizers that are commonly used?(a) Low cost(b) Low uptake rate(c) High efficiency(d) High uptake rateThis question was addressed to me during an online interview.My query is from Components of Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (d) High UPTAKE RATE The explanation is: Commonly used NEBULIZERS have a low uptake rate. They also have low cost and high EFFICIENCY.

Discussion

71.	Which of the following is applied in one or more stages where each stage is a series of three equally spaced parallel grids?(a) Ionisation field(b) Reflection(c) RF field(d) AccelerationI got this question in class test.I would like to ask this question from Radiofrequency Mass Spectrometer topic in division Mass Spectrometer of Analytical Instrumentation
Answer» The correct choice is (c) RF field To explain I WOULD say: RF field is applied in one or more stages. Each stage is a series of three EQUALLY SPACED parallel grids.

Discussion

72.	Which of the following has to be done to increase the resolution of the quadrupole mass spectrometer?(a) Increasing distance between detector and reflectron(b) Increasing difference between the individual rf accelerating stages(c) Increasing the length of the drift tube(d) Increasing the rod length of the electrodeThis question was addressed to me in an online quiz.My enquiry is from Quadrupole Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (d) Increasing the ROD length of the ELECTRODE Easiest explanation: The resolution DEPENDS UPON the electrode. The length of the electrode has to be INCREASED for increasing the resolution.

Discussion

73.	Which of the following detectors consist of an array of glass capillaries?(a) Faraday cup collector(b) Photographic plates(c) Micro-channel plate(d) Electron multiplier transducerThis question was posed to me in a job interview.This is a very interesting question from Ion Transducers topic in division Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (c) Micro-channel plate To EXPLAIN: Micro-channel plate consists of an ARRAY of GLASS capillaries. They are coated with ELECTRON emissive materials.

Discussion

74.	Which of the following produces the electron beam in magnetic deflection mass spectrometer?(a) Tungsten filament(b) Quartz rod(c) Silica(d) Rhodium filamentThis question was addressed to me in an interview for job.My question is taken from Magnetic Deflection Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (a) TUNGSTEN filament The explanation is: Tungsten filament PRODUCES the ELECTRON beam in MAGNETIC deflection mass spectrometer. The ELECTRONS are produced by the heated filament.

Discussion

75.	Which of the following is the normal nebuliser temperature used in LC mass spectrometry?(a) 50-100^oC(b) 100-200^oC(c) 125-150^oC(d) 150-200^oCThis question was addressed to me in examination.This interesting question is from Liquid Chromatograph- Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right choice is (C) 125-150^oC Easy explanation: 125-150^oC is the normal NEBULISER temperature used in LC MASS spectrometry. It is suitable for a variety of APPLICATIONS.

Discussion

76.	Only ______ percent of the effluent of the liquid chromatography must be introduced in the mass spectrometer.(a) 1-2 %(b) 1-5 %(c) 1-20 %(d) 1-15 %I had been asked this question in examination.I'm obligated to ask this question of Liquid Chromatograph- Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (B) 1-5 % The best explanation: Only 1-5 percent of the effluent of the LIQUID CHROMATOGRAPHY must be introduced in the MASS spectrometer. Therefore, the total effluent must be SPLIT.

Discussion

77.	The current produced by ions arriving at the collector necessitates the use of which of the following?(a) Wide band amplifier(b) Narrow band amplifier(c) Wide band filter(d) Narrow band filterThe question was posed to me by my school principal while I was bunking the class.Origin of the question is Time of Flight Mass Spectrometer in division Mass Spectrometer of Analytical Instrumentation
Answer» Right option is (a) Wide band amplifier To explain I WOULD say: The current produced by ions arriving at the COLLECTOR has very SHORT DURATION. Hence, it necessitates the use of wide band amplifier.

Discussion

78.	Photographic plates are coated with which of the following?(a) Lead(b) Quartz(c) Silver bromide(d) Mercuric sulphateThis question was addressed to me in semester exam.I want to ask this question from Ion Transducers in portion Mass Spectrometer of Analytical Instrumentation
Answer» The CORRECT choice is (c) Silver BROMIDE To ELABORATE: Photographic PLATES are coated with silver bromide. These are sensitive to energetic ions.

Discussion

79.	Which of the following is similar to photo multiplier transducer?(a) Faraday cup collector(b) Channeltron(c) Micro-channel plate(d) Electron multiplier transducerThis question was posed to me in unit test.I need to ask this question from Ion Transducers in section Mass Spectrometer of Analytical Instrumentation
Answer» Correct option is (d) Electron multiplier TRANSDUCER For explanation: Electron multiplier transducer is similar to PHOTO multiplier transducer. The difference is that its primary cathode DETECTS ions RATHER than photons.

Discussion

80.	Which of the following is not one of the types of mass analyser?(a) Magnetic sector analyser(b) Frequency sweep analyser(c) Double focussing spectrometer(d) Time of flight analyserThe question was posed to me in an internship interview.This is a very interesting question from Components of Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right OPTION is (b) Frequency SWEEP analyser The explanation is: Frequency sweep analyser is not a type of MASS analyser. There are many DEVICES AVAILABLE for mass analysis.

Discussion

81.	Mass spectrometer separates ions on the basis of which of the following?(a) Mass(b) Charge(c) Molecular weight(d) Mass to charge ratioI have been asked this question in class test.I'm obligated to ask this question of Principle of operation of Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (d) MASS to charge RATIO To explain I WOULD say: Mass spectrometer separates ions on the basis of mass to charge ratio. Most of the ions are singly charged. Hence, the mass to charge ratio is EQUAL to the mass.

Discussion

82.	Which of the following should be in a position to split the effluent?(a) Interface(b) Ion source(c) Makeup gas(d) MicroboreI got this question in exam.This key question is from Liquid Chromatograph- Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» RIGHT answer is (a) INTERFACE Easiest EXPLANATION: Interface should be in a position to split the EFFLUENT. LC-MS is a very ADVANTAGEOUS method.

Discussion

83.	Which of the following is the most sensitive of the spectral methods?(a) Absorption spectroscopy(b) Mass spectroscopy(c) Flame emission spectroscopy(d) Atomic emission spectroscopyThis question was addressed to me during an interview.This intriguing question originated from Gas Chromatograph- Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right answer is (B) Mass spectroscopy Easy explanation: Mass spectroscopy is the most sensitive of the spectral methods. It permits direct INTRODUCTION of a GAS effluent’s STREAM.

Discussion

84.	Continuous dynode electron multiplier transducer is a trumpet shaped device made with which of the following?(a) Glass doped with lead(b) Steel doped with bronze(c) Phosphor bronze doped with iron(d) Iron doped with calciumThis question was addressed to me in my homework.The origin of the question is Ion Transducers in chapter Mass Spectrometer of Analytical Instrumentation
Answer» The correct option is (a) Glass doped with lead For EXPLANATION: CONTINUOUS dynode electron MULTIPLIER transducer is a trumpet SHAPED DEVICE made of glass. It is heavily doped with lead.

Discussion

85.	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?(a) Same potential with same sign(b) Different potential with same sign(c) Different potential with different sign(d) Same potential with different signI got this question in an online quiz.I would like to ask this question from Quadrupole Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (d) Same potential with different SIGN Explanation: If to one pair of ELECTRODES one potential with one sign is applied, same potential with a different sign is applied to the OPPOSITE electrodes.

Discussion

86.	The rf spectrometer contains a magnet.(a) True(b) FalseThis question was addressed to me in class test.Question is taken from Radiofrequency Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» Correct answer is (b) False For explanation: Rf spectrometer does not CONTAIN a magnet. Rf field is APPLIED for this TYPE of MASS spectrometer.

Discussion

87.	Which of the following is not a component of quadrupole mass filter?(a) Electrodes(b) Choke(c) DC potential(d) DetectorI had been asked this question at a job interview.I would like to ask this question from Quadrupole Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT OPTION is (d) DETECTOR To explain: Detector is not a PART of the filter. The filter USES DC potential.

Discussion

88.	Which of the following is commonly varied in magnetic deflection mass spectrometer?(a) Electric sector(b) Magnetic fold strength(c) Magnetic constant(d) Electric constantI have been asked this question in exam.I would like to ask this question from Magnetic Deflection Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT answer is (b) Magnetic fold STRENGTH To elaborate: Magnetic fold strength is usually VARIED in magnetic deflection mass SPECTROMETER. Electric SECTOR is kept constant.

Discussion

89.	Which of the following is not a type of ion detector used in mass spectrometers?(a) Electron multiplier(b) Flame emission detector(c) Faraday cup collector(d) Photographic platesI have been asked this question during an online interview.My question is from Components of Mass Spectrometer topic in division Mass Spectrometer of Analytical Instrumentation
Answer» Correct answer is (b) Flame emission detector To ELABORATE: Flame emission detector is not a TYPE of ion detector used in mass spectrometers. Ion detectors PRODUCE a CURRENT on the OUTPUT side when there are ions on the input side.

Discussion

90.	Inlet system is also known as which of the following?(a) Initial system(b) Sample reservoir(c) Sample handling system(d) Element injection systemI got this question in class test.My question is taken from Components of Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation
Answer» Right choice is (c) Sample handling system To elaborate: INLET system introduces the sample into the ion SOURCE. Hence, it is called a sample handling system.

Discussion

91.	Which of the following probes are used for the introduction of the sample?(a) Silica(b) Quartz(c) Graphite(d) SilverI have been asked this question in class test.This is a very interesting question from Components of Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» Right CHOICE is (a) SILICA To elaborate: Solid samples with low vapour pressure are introduced into the entrance of the CHAMBER. They are introduced using silica or platinum PROBE.

Discussion

92.	A tandem mass spectrometer has which of the following analysers?(a) Time of flight mass analyser(b) Magnetic deflection analyser(c) Radiofrequency analyser(d) Quadrupole analyserI got this question in final exam.The above asked question is from Tandem Mass Spectroscopy in division Mass Spectrometer of Analytical Instrumentation
Answer» Correct option is (a) Time of flight mass ANALYSER For explanation: A TANDEM mass SPECTROMETER has a FILTER. The filter is followed by a time of flight mass analyser.

Discussion

93.	The ions are focussed and de-clustered through which of the following regions?(a) Dry helium region(b) Wet oxygen region(c) Wet chlorine region(d) Dry nitrogen regionThis question was addressed to me in my homework.Enquiry is from Liquid Chromatograph- Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation
Answer» The CORRECT choice is (d) Dry nitrogen REGION For EXPLANATION: The ions are focussed and de-clustered through a dry nitrogen region. It is then sent into the HIGH VACUUM analyser.

Discussion

94.	The system for measurement of ion intensity in GS-MS system consists of which of the following?(a) Band pass amplifier(b) Narrow band amplifier(c) Wide band amplifier(d) Low pass amplifierThis question was posed to me in an interview for job.My question comes from Gas Chromatograph- Mass Spectrometer topic in division Mass Spectrometer of Analytical Instrumentation
Answer» Correct choice is (C) Wide band amplifier Easiest explanation: The system for measurement of ION intensity in GS-MS system consists of a wide band amplifier. It feeds a DIRECT writing recorder.

Discussion

95.	ICP’s principle is similar to which of the following?(a) Flame emission spectroscopy(b) Fourier transforms spectroscopy(c) Atomic emission spectroscopy(d) Absorption spectroscopyThis question was posed to me during an interview.I'm obligated to ask this question of Inductively Coupled Plasma Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» RIGHT answer is (c) Atomic emission spectroscopy Explanation: ICP’s PRINCIPLE is similar to atomic emission spectroscopy. Samples are decomposed to neural ELEMENTS in argon PLASMA in this method.

Discussion

96.	Which of the following does not affect the resolution of the instrument?(a) Changing length of electrode(b) Changing slope of scan line(c) Quality of machining of the rods(d) Changing length of drift tubeThis question was posed to me in an interview.My doubt is from Quadrupole Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» CORRECT option is (d) Changing LENGTH of drift tube The explanation is: Changing length of drift tube does not affect the RESOLUTION of the instrument. Increase in resolution RESULTS in an increase in the number of ions reaching the detector.

Discussion

97.	The mass selection scheme uses a dc potential and not a radio frequency potential.(a) True(b) FalseI have been asked this question by my school principal while I was bunking the class.This intriguing question comes from Quadrupole Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right CHOICE is (b) False For explanation I WOULD say: The MASS selection SCHEME uses a dc potential. It ALSO uses radio frequency potential.

Discussion

98.	Which of the following is most often used in the chromatograph in gas chromatograph MS?(a) Curvette(b) Paper support(c) Capillary tube(d) FlaskThis question was addressed to me in an interview.This interesting question is from Gas Chromatograph- Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation
Answer» Right option is (C) Capillary tube Easiest explanation: Capillary tube is most often USED in the CHROMATOGRAPH in GAS chromatograph MS. This is because low PRESSURE has to be maintained.

Discussion

99.	The isobaric interference is not caused in which of the following elements?(a) Argon(b) Oxygen(c) Helium(d) NitrogenThe question was asked at a job interview.The doubt is from Inductively Coupled Plasma Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation
Answer» Correct answer is (C) Helium Easiest EXPLANATION: The isobaric interference is not CAUSED due to ISOTOPES of helium. It is caused by isotopes of ARGON, oxygen and nitrogen.

Discussion

100.	Which of the following is the disadvantage of ICP mass spectroscopy?(a) Incapable of multi-element analysis(b) Less sensitivity(c) Impossible to obtain isotopic information(d) Not useful for detection of non-metalsThe question was posed to me by my college director while I was bunking the class.The above asked question is from Inductively Coupled Plasma Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation
Answer» The CORRECT OPTION is (d) Not useful for detection of non-metals Easiest explanation: ICP mass spectroscopy has a multi-element capability and high sensitivity. It is not CAPABLE of multi-element ANALYSIS.

Discussion

Explore topic-wise InterviewSolutions in .

Time of flight mass spectrometer has an unlimited mass range.(a) True(b) FalseThe question was posed to me in an online interview.I'd like to ask this question from Time of Flight Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation

All the ions entering the tube have the same kinetic energy.(a) True(b) FalseThis question was addressed to me in an online interview.This is a very interesting question from Time of Flight Mass Spectrometer topic in section Mass Spectrometer of Analytical Instrumentation

Photographic plates have greater sensitivity and resolution than electron multipliers.(a) True(b) FalseI had been asked this question in a national level competition.I need to ask this question from Ion Transducers in portion Mass Spectrometer of Analytical Instrumentation

Mass analyser is similar to which of the following in optical spectrometer?(a) Source(b) Monochromator(c) Detector(d) SampleThe question was asked in an interview for job.This question is from Components of Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation

An accuracy of 1 part in 10^2 has been obtained in precision mass measurements.(a) True(b) FalseThe question was asked during an interview.My query is from Magnetic Deflection Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation

Discrete type electron multiplier transducers can provide current gain upto which of the following?(a) 10^2(b) 10^5(c) 10^7(d) 10^11This question was posed to me in class test.This interesting question is from Ion Transducers topic in chapter Mass Spectrometer of Analytical Instrumentation

Photographic plates are coated with which of the following?(a) Lead(b) Quartz(c) Silver bromide(d) Mercuric sulphateThis question was addressed to me in semester exam.I want to ask this question from Ion Transducers in portion Mass Spectrometer of Analytical Instrumentation

Which of the following should be in a position to split the effluent?(a) Interface(b) Ion source(c) Makeup gas(d) MicroboreI got this question in exam.This key question is from Liquid Chromatograph- Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation

The rf spectrometer contains a magnet.(a) True(b) FalseThis question was addressed to me in class test.Question is taken from Radiofrequency Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation

Which of the following is not a component of quadrupole mass filter?(a) Electrodes(b) Choke(c) DC potential(d) DetectorI had been asked this question at a job interview.I would like to ask this question from Quadrupole Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation

Inlet system is also known as which of the following?(a) Initial system(b) Sample reservoir(c) Sample handling system(d) Element injection systemI got this question in class test.My question is taken from Components of Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation

Which of the following probes are used for the introduction of the sample?(a) Silica(b) Quartz(c) Graphite(d) SilverI have been asked this question in class test.This is a very interesting question from Components of Mass Spectrometer topic in chapter Mass Spectrometer of Analytical Instrumentation

The isobaric interference is not caused in which of the following elements?(a) Argon(b) Oxygen(c) Helium(d) NitrogenThe question was asked at a job interview.The doubt is from Inductively Coupled Plasma Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation