Preview Questions Chemical Researcher | Role Specific Skill

Question 1: In High-Performance Liquid Chromatography (HPLC), what is the role of the mobile phase?

Which action should you take?

Choose only one option

To maintain a constant temperature for the analysis

To separate the components based on their interaction with the stationary phase

To enhance the selectivity of the separation

To increase the pressure required for the separation

Question 2: How would you design an experiment to evaluate the corrosion resistance of a material exposed to different chemical environments?

Which action should you take?

Choose only one option

Only test materials under acidic conditions

Limit testing to ambient temperature only

Vary the environmental conditions and material types, and measure corrosion rates

Use a constant temperature and exposure time for all environments

Question 3: How should you present quantitative data in a chemical research report to ensure clarity and accessibility?

Which action should you take?

Choose only one option

Present raw data without any units or explanations

Use well-labeled tables and figures with appropriate units and provide a clear explanation of the data

Present data in unformatted text

Use only graphs and omit raw data entirely

Question 4: What is the importance of calibrating analytical instruments before beginning a chemical experiment?

Which action should you take?

Choose only one option

To waste time and delay the experiment

To adjust the instruments for different types of chemicals

To make the equipment look more reliable

To ensure consistent accuracy in measurements and to reduce instrument drift

Question 5: When conducting an experiment to determine the optimum pH for an enzyme-catalyzed reaction, which approach is most appropriate?

Which action should you take?

Choose only one option

Measure enzyme concentration only

Test only two extreme pH values to observe the maximum effect

Test a wide range of pH values and measure reaction rate at each

Use a fixed pH and measure the enzyme's stability over time

Question 6: How does an electron paramagnetic resonance (EPR) spectrometer detect unpaired electrons in a sample?

Which action should you take?

Choose only one option

By measuring the absorption of microwave radiation by unpaired electrons in a magnetic field

By measuring the heat generated by unpaired electrons

By detecting the light emitted by excited electrons

By analyzing the molecular structure of the sample