Thermo Fisher Scientific Senior Chemist Interview Questions and Answers

Designing a vacuum pump involves selecting the appropriate type, determining the required flow rate and pressure, and sizing the components.

• Choose the type of vacuum pump based on the application (e.g. rotary vane, diaphragm, scroll, etc.)

• Determine the required flow rate and pressure for the system

• Size the components, including the pump, motor, and piping, to meet the flow rate and pressure requirements

• Consider factors...read more

TFF is a measure of cash generated from operations, while CFF is a measure of cash generated from financing activities.

• TFF stands for 'Total Funds From Operations' and measures the cash generated from a company's core business operations.

• CFF stands for 'Cash Flow From Financing' and measures the cash generated from financing activities such as issuing stocks or bonds.

• TFF is an important metric for evaluating a company'...read more

Risk assessment involves identifying potential risks and evaluating their likelihood and impact.

• Identify potential risks and their likelihood of occurring

• Evaluate the potential impact of each risk

• Develop strategies to mitigate or manage identified risks

• Regularly review and update risk assessments

• Examples: financial risk assessment, cybersecurity risk assessment

I worked as a Quality Analyst at XYZ Company for 2 years.

• Conducted quality assurance testing on software applications

• Identified and reported bugs and issues to development team

• Collaborated with stakeholders to ensure product met quality standards

There are three types of validations: front-end, back-end, and database. Each type requires a different approach.

• Front-end validation is done on the client-side and checks for user input errors before submitting the form.

• Back-end validation is done on the server-side and checks for errors in the data submitted by the user.

• Database validation checks for data integrity and consistency in the database.

• Handling of validati...read more

Calibration of instruments is a crucial process to ensure accuracy and reliability of measurements.

• Calibration involves comparing the measurements of an instrument to a known standard.

• It helps in identifying and correcting any deviations or errors in the instrument's readings.

• Calibration ensures that the instrument is performing within acceptable limits and provides accurate results.

• It is necessary to calibrate instrum...read more

HPLC is a technique used to separate, identify, and quantify components in a mixture based on their interaction with a stationary phase and mobile phase.

• HPLC stands for High-Performance Liquid Chromatography.

• The principle of HPLC involves the separation of components in a mixture based on their affinity for the stationary phase and mobile phase.

• The instrumentation of HPLC includes a pump to deliver the mobile phase, a ...read more

GC stands for Gas Chromatography, a principle and instrumentation used for separating and analyzing volatile compounds.

• GC is a technique used in analytical chemistry to separate and identify components of a mixture.

• It involves injecting a sample into a gas chromatograph, which vaporizes the sample and carries it through a column.

• The column contains a stationary phase that interacts with the sample components, causing t...read more

UV spectroscopy is a technique that uses ultraviolet light to analyze the chemical composition of substances.

• UV spectroscopy is based on the principle that molecules absorb ultraviolet light at specific wavelengths.

• The Beer-Lambert law relates the concentration of a substance to the amount of light it absorbs.

• UV spectroscopy is commonly used in pharmaceutical, environmental, and forensic analysis.

• It is used to determin...read more

Molarity, molality, and normality are measures of concentration in chemistry. UV range refers to the range of ultraviolet light.

• Molarity is the number of moles of solute per liter of solution.

• Molality is the number of moles of solute per kilogram of solvent.

• Normality is the number of equivalents of solute per liter of solution.

• UV range refers to the range of wavelengths of ultraviolet light, typically between 10 and 40