MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Food Processing Unit Operations knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Can negative peaks occur in HPLC? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Are these statements about the silica gel are used in TLC true?Statement 1: It is widely used adsorbent and remains the dominant stationary phase. |
| A. | nStatement 2: The silanols are less acidic. |
| B. | True, False |
| C. | True, True |
| D. | False, True |
| E. | False, False |
| Answer» C. True, True | |
| 3. |
What causes peak tailing? |
| A. | Depends on the concentration of solvent |
| B. | Occurrence of more than one mechanism of analytic retention |
| C. | Depends on the concentration of solute |
| D. | No occurrence of more than one mechanism of analytic retention |
| Answer» C. Depends on the concentration of solute | |
| 4. |
Are these statements about the TFA (trifluoroacetic acid) in HPLC true?Statement 1: It is commonly used as mobile phase additive. |
| A. | nStatement 2: It reduces the LC/MS signal. |
| B. | True, False |
| C. | True, True |
| D. | False, True |
| E. | False, False |
| Answer» C. True, True | |
| 5. |
Why acetonitrile is used as solvent in HPLC? |
| A. | Improve chromatographic peak shape |
| B. | Provide a source of protons in reverse phase LC/MS |
| C. | Provide a source of electrons in reverse phase LC/MS |
| D. | Improve chromatographic peak shape and provide a source of protons in reverse phase LC/MS |
| Answer» E. | |
| 6. |
What are the two main types of chromatography? |
| A. | Liquid chromatography and paper chromatography |
| B. | Liquid chromatography and gas chromatography |
| C. | Liquid chromatography and solid chromatography |
| D. | Solid chromatography and gas chromatography |
| Answer» C. Liquid chromatography and solid chromatography | |
| 7. |
What does a high RF value mean in paper chromatography? |
| A. | Substance is very non-polar |
| B. | Substance is medium non-polar |
| C. | Substance is polar |
| D. | Substance is neutral |
| Answer» C. Substance is polar | |
| 8. |
What is the best solvent for paper chromatography? |
| A. | Water |
| B. | Alcohol |
| C. | Vinegar |
| D. | Methanol |
| Answer» B. Alcohol | |
| 9. |
What is Rf value? |
| A. | Ratio of the distance moved by the solvent and the distance moved by the solute |
| B. | Ratio of the distance moved by the solute and the distance moved by the solvent |
| C. | Ratio of the concentration of solute and the concentration of the solvent |
| D. | It Ratio of the concentration of solvent and the concentration of the solute |
| Answer» C. Ratio of the concentration of solute and the concentration of the solvent | |
| 10. |
What is the principle behind paper chromatography? |
| A. | It is based on partition chromatography |
| B. | It is based on ions and its charge |
| C. | It is based on charges only |
| D. | It is based on ions only |
| Answer» B. It is based on ions and its charge | |