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MCQs

Total Questions : 147 | Page 11 of 15 pages
Question 101. Molar absorbtivity is the measure of the
  1.    amount of light reflected and absorbed per unit concentration
  2.    None of these
  3.    amount of light absorbed per unit length
  4.    amount of light absorbed per unit concentration
 Discuss Question
Answer: Option D. -> amount of light absorbed per unit concentration
Question 102. In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the
  1.    None of these
  2.    light is faster today that it used to be
  3.    the Fourier Transfer Algorithm allows us to scan all frequencies at once
  4.    absence of broad spectrum of wavelenth
 Discuss Question
Answer: Option C. -> the Fourier Transfer Algorithm allows us to scan all frequencies at once
Question 103. Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?
  1.    None of these
  2.    Because %T cannot be measured as accurately as absorbance
  3.    Because %T is dependant on the power of the incident radiation
  4.    Because absorbance is proportional to the concentration of the analyte, whereas %T is not
 Discuss Question
Answer: Option D. -> Because absorbance is proportional to the concentration of the analyte, whereas %T is not
Question 104. Molar absorbtivities of compounds exhibiting charge transfer absorption are
  1.    none of these
  2.    small
  3.    large
  4.    moderate
 Discuss Question
Answer: Option C. -> large
Question 105. Which of the following relationships between absorbance and %transmittance is incorrect?
  1.    All are correct
  2.    A = log10 100 / %T
  3.    A = log10 1 / T
  4.    A = 2 - log10 %T
 Discuss Question
Answer: Option C. -> A = log10 1 / T
Question 106. Which of the following will oscillate the fastest?
  1.    A large mass on a weak spring
  2.    A small mass on a weak spring
  3.    A large mass on a stiff spring
  4.    A small mass on a stiff spring
 Discuss Question
Answer: Option D. -> A small mass on a stiff spring
Question 107. In the equation, A = ε bc, what quantity is represented by "ε"?
  1.    Molar absorbtivity
  2.    None of these
  3.    Path length
  4.    Absorbtivity
 Discuss Question
Answer: Option A. -> Molar absorbtivity
Question 108. Where does a carbonyl (C=0) stretch appear in an IR spectrum?
  1.    3640-3250
  2.    1870-1650
  3.    160-110
  4.    1740-1720
 Discuss Question
Answer: Option B. -> 1870-1650
Question 109. Why must the voltage supplied to a tungsten lamp be very stable?
  1.    All of these
  2.    Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
  3.    Because the lamp will only function at a specific voltage
  4.    Because if it wasn't, the lamp would bum out
 Discuss Question
Answer: Option B. -> Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
Question 110. Which of the following is not an IR vibrational mode?
  1.    Rolling
  2.    Stretching
  3.    Scissoring
  4.    Rocking
 Discuss Question
Answer: Option A. -> Rolling

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