Lyrus Life Science Chemist Quality Control Interview Questions and Answers for Freshers

pH is a measure of the acidity or alkalinity of a solution.

• pH stands for 'potential of hydrogen'.

• It is a logarithmic scale ranging from 0 to 14.

• A pH of 7 is considered neutral, below 7 is acidic, and above 7 is alkaline.

• pH is determined by the concentration of hydrogen ions in a solution.

• Examples: Lemon juice has a pH of around 2, while baking soda has a pH of around 9.

PH represents the concentration of hydrogen ions in a sample.

• PH is measured on a scale of 0-14, with 7 being neutral.

• A lower PH indicates higher acidity, while a higher PH indicates higher alkalinity.

• PH can be measured using a PH meter or through chemical indicators.

• The PH of a sample can affect its chemical properties and reactions.

LOD stands for Limit of Detection. It is the lowest concentration of a substance that can be reliably detected.

• LOD is used to determine the sensitivity of an analytical method.

• It is usually expressed as a concentration or mass.

• Water is a chemical compound composed of hydrogen and oxygen, while LOD is a term used in analytical chemistry.

• LOD is important in environmental testing to determine the presence of contaminants ...read more

SQL query to find managers of employees with single table of employee designation and empid

• Use self join to join the table with itself on manager id and employee id

• Filter the result to only include employees with managers

• Select the manager name and employee name

Issues faced while visualizing on Tableau

• Data not properly formatted

• Incorrect use of chart types

• Inadequate labeling and formatting

• Poor data quality

• Lack of understanding of Tableau features

• Slow performance with large datasets