MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following components of a monochromator is the dispersing element? |
| A. | The collimating lens |
| B. | The entrance slit |
| C. | The diffraction grating |
| D. | None of these |
| Answer» D. None of these | |
| 2. |
Where does a carbonyl (C=0) stretch appear in an IR spectrum? |
| A. | 1740-1720 |
| B. | 1870-1650 |
| C. | 3640-3250 |
| D. | 160-110 |
| Answer» C. 3640-3250 | |
| 3. |
Which of the following is not an IR vibrational mode? |
| A. | Stretching |
| B. | Scissoring |
| C. | Rocking |
| D. | Rolling |
| Answer» E. | |
| 4. |
Vibrational spectroscopy is |
| A. | a large mass on a weak spring |
| B. | a flashlight through a prism and shake it |
| C. | a class of spectroscopic techniques which analyzes molecular motions |
| D. | an Infrared spectroscopy |
| Answer» D. an Infrared spectroscopy | |
| 5. |
Why are rotational transitions of little use to a spectroscopist? |
| A. | Because the energy required to induce a rotational transition is so small that it cannot be measured |
| B. | Because rotational transitions are extremely rare |
| C. | Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions |
| D. | All of the above |
| Answer» D. All of the above | |
| 6. |
In the equation, A = bc, what quantity is represented by " "? |
| A. | Absorbtivity |
| B. | Molar absorbtivity |
| C. | Path length |
| D. | None of these |
| Answer» C. Path length | |
| 7. |
A simple harmonic oscillator may absorb energy |
| A. | at anytime. |
| B. | when the frequencies match exactly |
| C. | when the amplitudes are the same. |
| D. | at no time. |
| Answer» C. when the amplitudes are the same. | |
| 8. |
Why must the voltage supplied to a tungsten lamp be very stable? |
| A. | Because if it wasn't, the lamp would bum out |
| B. | Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage |
| C. | Because the lamp will only function at a specific voltage |
| D. | All of the above |
| Answer» C. Because the lamp will only function at a specific voltage | |
| 9. |
Molar absorbtivities of compounds exhibiting charge transfer absorption are |
| A. | small |
| B. | moderate |
| C. | large |
| D. | none of these |
| Answer» D. none of these | |
| 10. |
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance? |
| A. | Because %T cannot be measured as accurately as absorbance |
| B. | Because %T is dependant on the power of the incident radiation |
| C. | Because absorbance is proportional to the concentration of the analyte, whereas %T is not |
| D. | none of the above |
| Answer» D. none of the above | |
| 11. |
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 |
| A. | the Fourier Transfer Algorithm allows us to scan all frequencies at once |
| B. | light is faster today that it used to be |
| C. | absence of broad spectrum of wavelenth |
| D. | none of the above |
| Answer» B. light is faster today that it used to be | |
| 12. |
Molar absorbtivity is the measure of the |
| A. | amount of light absorbed per unit length |
| B. | amount of light absorbed per unit concentration |
| C. | amount of light reflected and absorbed per unit concentration |
| D. | None of the above |
| Answer» C. amount of light reflected and absorbed per unit concentration | |
| 13. |
Which of the following will oscillate the fastest? |
| A. | A large mass on a weak spring |
| B. | A large mass on a stiff spring |
| C. | A small mass on a stiff spring |
| D. | A small mass on a weak spring |
| Answer» D. A small mass on a weak spring | |