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Total Questions : 133 | Page 4 of 14 pages
Question 31. Mass spectrometers are used to determine which of the following?
  1.    Composition in sample
  2.    Concentration of elements in sample
  3.    Relative mass of atoms
  4.    Properties of sample
 Discuss Question
Answer: Option C. -> Relative mass of atoms
Answer: (c).Relative mass of atoms
Question 32. In mass spectrometer, the sample that has to be analysed is bombarded with which of the following?
  1.    Protons
  2.    Electrons
  3.    Neutrons
  4.    Alpha particles
 Discuss Question
Answer: Option B. -> Electrons
Answer: (b).Electrons
Question 33. In mass spectrometer, the ions are sorted out in which of the following ways?
  1.    By accelerating them through electric field
  2.    By accelerating them through magnetic field
  3.    By accelerating them through electric and magnetic field
  4.    By applying a high voltage
 Discuss Question
Answer: Option C. -> By accelerating them through electric and magnetic field
Answer: (c).By accelerating them through electric and magnetic field
Question 34. Who invented mass spectrometers?
  1.    J.J Thompson
  2.    Goldstein
  3.    Nikola Tesla
  4.    Aston
 Discuss Question
Answer: Option A. -> J.J Thompson
Answer: (a).J.J Thompson
Question 35. Mass spectrometer separates ions on the basis of which of the following?
  1.    Mass
  2.    Charge
  3.    Molecular weight
  4.    Mass to charge ratio
 Discuss Question
Answer: Option D. -> Mass to charge ratio
Answer: (d).Mass to charge ratio
Question 36. 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
 Discuss Question
Answer: Option B. -> Central grid
Answer: (b).Central grid
Question 37. 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
 Discuss Question
Answer: Option B. -> Potential energy selector
Answer: (b).Potential energy selector
Question 38. 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
 Discuss Question
Answer: Option D. -> All spectrometers have the ability to record the entire mass spectrum at a time
Answer: (d).All spectrometers have the ability to record the entire mass spectrum at a time
Question 39. 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
 Discuss Question
Answer: Option C. -> RF field
Answer: (c).RF field
Question 40. The rf spectrometer contains a magnet.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False

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