Sail E0 Webinar

MCQs

Total Questions : 57 | Page 4 of 6 pages
Question 31. The signal reaching which of the following components is the one lying in the window of pulse height analyser?
  1.    Pre-amplifier
  2.    Linear amplifier
  3.    Counter
  4.    Discriminator
 Discuss Question
Answer: Option C. -> Counter
Answer: (c).Counter
Question 32. Which of the following is used when the number of channels is ten or less?
  1.    Two discriminators in series
  2.    Two discriminators in parallel
  3.    Series array of discriminators
  4.    Parallel array of discriminators
 Discuss Question
Answer: Option D. -> Parallel array of discriminators
Answer: (d).Parallel array of discriminators
Question 33. In liquid scintillation counter, which of the following is a fluorescent substance?
  1.    Solvent
  2.    Solute
  3.    Crystal
  4.    Reagent
 Discuss Question
Answer: Option B. -> Solute
Answer: (b).Solute
Question 34. When UV light is absorbed by the fluor molecules the light emitted is in which of the following colours?
  1.    Pink
  2.    Red
  3.    Green
  4.    Blue
 Discuss Question
Answer: Option D. -> Blue
Answer: (d).Blue
Question 35. The reduction in counting efficiency of the scintillation detector is called as __________
  1.    Disintegration
  2.    Decay
  3.    Quenching
  4.    Reduction
 Discuss Question
Answer: Option C. -> Quenching
Answer: (c).Quenching
Question 36. Which of the following is not a type of quenching?
  1.    Chemical quench
  2.    Interference quench
  3.    Colour quenching
  4.    Self-absorption
 Discuss Question
Answer: Option B. -> Interference quench
Answer: (b).Interference quench
Question 37. In liquid scintillation counter, which of the following is used to convert light into electrical signals?
  1.    Photo multiplier tube
  2.    Photo emissive tube
  3.    Photo voltaic cell
  4.    Photo reflector
 Discuss Question
Answer: Option A. -> Photo multiplier tube
Answer: (a).Photo multiplier tube
Question 38. Due to the presence of red, green and yellow colour in the vial, which of the following occurs?
  1.    Chemical quench
  2.    Interference quench
  3.    Colour quenching
  4.    Self-absorption
 Discuss Question
Answer: Option C. -> Colour quenching
Answer: (c).Colour quenching
Question 39. Variation of gain with temperature does not cause instability.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 40. In which type of quenching, the radiation emitted by the isotope is not detected due to absorption of the radiation by the sample itself?
  1.    Chemical quench
  2.    Interference quench
  3.    Colour quenching
  4.    Self-absorption
 Discuss Question
Answer: Option D. -> Self-absorption
Answer: (d).Self-absorption

Latest Videos

Latest Test Papers