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Home⇒ Medical Science⇒ Biochemistry⇒ Spectroscopy
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance? Because absorbance is proportional to the concentration of the analyte, whereas %T is not [other wrong options] [Discuss in forum] ![]() ![]() Because %T cannot be measured as accurately as absorbance Because %T is dependant on the power of the incident radiation none of the above |
Q2 ⇒ UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)? n → π* and π → π* [other wrong options] [Discuss in forum] ![]() ![]() σ → σ* n → σ* none of these |
Q3 ⇒ Molar absorbtivity is the measure of the amount of light absorbed per unit concentration [other wrong options] [Discuss in forum] ![]() ![]() amount of light absorbed per unit length amount of light reflected and absorbed per unit concentration None of the above |
Q4 ⇒ Which of the following components of a monochromator is the dispersing element? The diffraction grating [other wrong options] [Discuss in forum] ![]() ![]() The collimating lens The entrance slit None of these |
Q5 ⇒ In the equation, A = ε bc, what quantity is represented by "ε"? Molar absorbtivity [other wrong options] [Discuss in forum] ![]() ![]() Absorbtivity Path length None of these |
Q6 ⇒ Which of the following relationships between absorbance and %transmittance is incorrect? A = log10 1 / T [other wrong options] [Discuss in forum] ![]() ![]() A = log10 100 / %T A = 2 - log10 %T All are correct |
Q7 ⇒ A simple harmonic oscillator may absorb energy when the frequencies match exactly [other wrong options] [Discuss in forum] ![]() ![]() at anytime. when the amplitudes are the same. at no time. |
Q8 ⇒ Which of the following is not an IR vibrational mode? Rolling [other wrong options] [Discuss in forum] ![]() ![]() Stretching Scissoring Rocking |
Q9 ⇒ Why are rotational transitions of little use to a spectroscopist? Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions [other wrong options] [Discuss in forum] ![]() ![]() Because the energy required to induce a rotational transition is so small that it cannot be measured Because rotational transitions are extremely rare All of the above |
Q10 ⇒ Molar absorbtivities of compounds exhibiting charge transfer absorption are large [other wrong options] [Discuss in forum] ![]() ![]() small moderate none of these |
Q11 ⇒ Where does a carbonyl (C=0) stretch appear in an IR spectrum? 1870-1650 [other wrong options] [Discuss in forum] ![]() ![]() 1740-1720 3640-3250 160-110 |
Q12 ⇒ 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 the Fourier Transfer Algorithm allows us to scan all frequencies at once [other wrong options] [Discuss in forum] ![]() ![]() light is faster today that it used to be absence of broad spectrum of wavelenth none of the above |
Q13 ⇒ Vibrational spectroscopy is a class of spectroscopic techniques which analyzes molecular motions [other wrong options] [Discuss in forum] ![]() ![]() a large mass on a weak spring a flashlight through a prism and shake it an Infrared spectroscopy |
Q14 ⇒ Why must the voltage supplied to a tungsten lamp be very stable? Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage [other wrong options] [Discuss in forum] ![]() ![]() Because if it wasn't, the lamp would bum out Because the lamp will only function at a specific voltage All of the above |
Q15 ⇒ Which of the following will oscillate the fastest? A small mass on a stiff spring [other wrong options] [Discuss in forum] ![]() ![]() A large mass on a weak spring A large mass on a stiff spring A small mass on a weak spring |
Q16 ⇒ Beer's Law states that absorbance is proportional to both the path length and concentration of the absorbing species [other wrong options] [Discuss in forum] ![]() ![]() absorbance is proportional to the log of the concentration of the absorbing species absorbance is equal to P0 / P none of the above |