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MCQs

Total Questions : 57 | Page 2 of 6 pages
Question 11. Which of the following formulae gives the expression for half-life of a radioactive isotope when ‘λ’ is the decay constant?
  1.    0.762/λ
  2.    0.693/λ
  3.    0.937/λ
  4.    0.258/λ
 Discuss Question
Answer: Option B. -> 0.693/λ
Answer: (b).0.693/λ
Question 12. Which of the following emissions have low ionizing power?
  1.    Alpha particles
  2.    Beta particles
  3.    Gamma particles
  4.    X-ray particles
 Discuss Question
Answer: Option C. -> Gamma particles
Answer: (c).Gamma particles
Question 13. Which of the following acts as ionising gas in Geiger Muller counter?
  1.    Alcohol
  2.    Argon gas
  3.    Krypton
  4.    Hydrogen
 Discuss Question
Answer: Option B. -> Argon gas
Answer: (b).Argon gas
Question 14. Which of the detectors is similar to Geiger Muller counter in construction but is filled with heavier gas?
  1.    Proportional counter
  2.    Flow counter
  3.    Semiconductor detector
  4.    Scintillation counter
 Discuss Question
Answer: Option A. -> Proportional counter
Answer: (a).Proportional counter
Question 15. Scintillation detector is a large flat crystal of which of the following materials?
  1.    Sodium chloride
  2.    Sodium iodide
  3.    Sodium sulphate
  4.    Sodium carbonate
 Discuss Question
Answer: Option A. -> Sodium chloride
Answer: (a).Sodium chloride
Question 16. Which of the following is the main disadvantage of solid state semiconductor detector?
  1.    Low accuracy
  2.    Low sensitivity
  3.    It should be maintained at low temperature
  4.    High pressure has to be produced
 Discuss Question
Answer: Option C. -> It should be maintained at low temperature
Answer: (c).It should be maintained at low temperature
Question 17. Which of the following gases are used in the proportional counter as the ionising gas?
  1.    Alcohol
  2.    Argon gas
  3.    Krypton
  4.    Hydrogen
 Discuss Question
Answer: Option C. -> Krypton
Answer: (c).Krypton
Question 18. Which of the following components adds all the signals and determines where each scintillation event occurred in the detector?
  1.    Collimator
  2.    Detector crystal
  3.    Photo multiplier tubes
  4.    Position circuitry
 Discuss Question
Answer: Option D. -> Position circuitry
Answer: (d).Position circuitry
Question 19. Gamma camera uses which of these components to produce a position intensity picture of a radioactive area?
  1.    Collimator
  2.    Scintillation detector
  3.    Photo multiplier tubes
  4.    Position circuitry
 Discuss Question
Answer: Option B. -> Scintillation detector
Answer: (b).Scintillation detector
Question 20. Gamma camera uses one scintillation detector.
  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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