Quiz  /  Mass Spectroscopy Gate & PSU MCQ Questions With Answers

  • 1. 
    Where is the molecular ion peak?

  • 57 amu
  • 29 amu
  • 72 amu
  • 43 amu

  • 2. 
    Which of the following cannot be used as a MALDI matrix compound?

  • α-Cyano-4-hydroxycinnamic acid
  • SA
  • 3-Hydroxypicolinic acid
  • 2,3-Dihydroxybenzoic acid

  • 3. 
    Based on the mass spec data, which Iron isotope is the most abundant?

  • Fe-54
  • Fe-56
  • Fe-57
  • Fe-58

  • 4. 
    Who discovered the mass spectrometer?

  • Francis Aston
  • J. J Thomson
  • Ernest O. Lawrence
  • Walter Kaufmann

  • 5. 
    How many isotopes of this element are shown in the mass spectrum?

  • 98
  • 7
  • 100
  • 95.9 g/mol

  • 6. 
    The average atomic mass for nitrogen is 14.0067 amu. If you have a sample of nitrogen atoms, what is the chance that one randomly selected atom will have a mass of 14.0067 amu?

  • 0.0%
  • 0.0067%
  • 90%
  • 100%

  • 7. 
    How many isotopes are shown in this mass spectrum?

  • 1
  • 84
  • 86
  • 4

  • 8. 
    What do the peaks on the mass spectrum represent?

  • anions
  • different isotopes
  • atoms with differing numbers of electrons
  • numbers of electrons

  • 9. 
    Based on the mass spectrum, which isotope of chlorine is most abundant?

  • 35Cl
  • 37Cl
  • 70Cl
  • 72Cl

  • 10. 
    How many isotopes are shown in this mass spec?

  • 1
  • 2
  • 6
  • 7

  • 11. 
    A sample of pure chlorine gas is analyzed in the MS. Which of the following is a correct interpretation?

  • Chlorine has an isotope with a mass of 70 amu
  • Chlorine has three known isotopes
  • Chlorine is diatomic
  • Chlorine is highly reactive

  • 12. 
    What do you expect the molar mass to be for this element?

  • 91.4 g/mol
  • 90.0 g/mol
  • 4 g/mol
  • 50. g/mol

  • 13. 
    Which of the following ionization technique uses a short laser pulse to achieve ionization?

  • ESI
  • Chemical Ionization
  • EI
  • MALDI

  • 14. 
    Choose the correct sequence of MS procedure ?p. The ion signal is processed into mass spectra.q. The ions are detected usually by a quantitative method.r. The ions are separated according to their mass to charge ratio in an analyzer by electromagnetic fields.s. The components of the sample are ionized by one of a variety of methods (e.g. by impacting them with an electron beam) which result in the formation of charged particles.t. A sample is loaded into the MS instrument and undergoes vaporization

  • p→q→r→s→t
  • t→s→r→q→p
  • p→t→r→s→q
  • q→t→r→s→p

  • 15. 
    Which of the following main component of mass spectroscopy deal with resolving the ions into their characteristics mass components according to their mass-to-charge ratio?

  • Ion Source
  • Analyzer
  • Detector System
  • Recorder

  • 16. 
    Which of the following classifies Chemical Ionization most accurately

  • A hard ionization technique
  • A soft ionization technique
  • neither hard or soft ionization
  • A desorption ionization technique

  • 17. 
    What is the molecular mass of the compound?

  • 83 g/mol
  • 99 g/mol
  • 98 g/mol
  • 55 g/mol

  • 18. 
    What are the main criteria on which mass spectrometer used for?

  • Composition in sample
  • Relative mass of atoms
  • Concentration of elements in the sample
  • Properties of sample

  • 19. 
    Where is the base peak?

  • 57 amu
  • 29 amu
  • 72 amu
  • 43 amu

  • 20. 
    Which mass analyzer is most frequently used with MALDI?

  • Magnetic sector
  • Quadrupole
  • Ion trap
  • TOF

  • 21. 
    Name an ionization technique which uses a capillary tube to form molecular ions prior to charge transfer with an analyte

  • Electrospray Ionization
  • Atmospheric Pressure Photoionization
  • Matrix –Assisted Laser Desorption Ionization
  • Atmospheric Pressure Chemical Ionization

  • 22. 
    Sublimation occurs in which of the following ionization methods?

  • ESI
  • FAB
  • Chemical Ionization
  • MALDI

  • 23. 
    Carbon has three known isotopes. Which is the most abundant?

  • carbon-12.011
  • carbon-12
  • carbon-13
  • carbon-14
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