Bureau Veritas Lab Chemist Interview Questions and Answers

Reflection is the bouncing back of light waves from a surface, while refraction is the bending of light waves as they pass through a medium.

• Reflection occurs when light waves hit a surface and bounce back, like a mirror reflecting an image.

• Refraction occurs when light waves pass through a medium with a different density, causing them to bend, like a straw appearing bent in water.

• Electrolytes are substances that conduct...read more

To prepare 0.1N HCl, dilute 8.3 mL of concentrated HCl to 1 liter with distilled water.

• Measure 8.3 mL of concentrated HCl using a graduated cylinder.

• Add the concentrated HCl to a 1 liter volumetric flask.

• Fill the flask with distilled water up to the 1 liter mark.

• Mix the solution thoroughly to ensure uniformity.

• The resulting solution will be 0.1N HCl.

Anode and cathode are electrodes used in electrochemical cells to facilitate the flow of electrons.

• Anode is the electrode where oxidation occurs and electrons are lost.

• Cathode is the electrode where reduction occurs and electrons are gained.

• In a battery, the anode is the negative terminal and the cathode is the positive terminal.

• In an electrolytic cell, the anode is the positive terminal and the cathode is the negative

H2O and HCl exhibit different behaviors due to their chemical properties.

• H2O is a polar molecule, while HCl is a polar covalent molecule.

• H2O has a higher boiling point and melting point than HCl.

• HCl is a strong acid, while H2O is a neutral molecule.

• H2O can act as a solvent for many substances, while HCl is mainly used in chemical reactions.

• H2O has a higher density than HCl.

Testing is a process of evaluating the performance or characteristics of a substance or system.

• Testing involves conducting experiments or analyses to gather data and draw conclusions.

• It is used to ensure the quality, safety, and effectiveness of products or processes.

• Chemical testing may involve analyzing the composition, purity, or properties of substances.

• Testing methods can include physical, chemical, or biological ...read more

Environmental testing is crucial for ensuring the safety of our surroundings and preventing harm to human health.

• Identifies potential hazards and risks to human health and the environment

• Helps in developing and implementing effective pollution control measures

• Ensures compliance with environmental regulations and standards

• Examples include testing for air and water quality, soil contamination, and hazardous waste disposa...read more

AFR stands for Air Fuel Ratio, a critical parameter in combustion processes.

• AFR is the ratio of air to fuel in an internal combustion engine.

• It is measured using a device called an oxygen sensor.

• The ideal AFR varies depending on the type of fuel and engine.

• A lean AFR (more air, less fuel) can improve fuel efficiency but may cause engine damage.

• A rich AFR (more fuel, less air) can improve performance but may increase em...read more

AFR testing is a process of measuring the air-to-fuel ratio in an engine to optimize its performance and reduce emissions.

• AFR stands for Air-Fuel Ratio

• It is commonly used in automotive and aviation industries

• The ideal AFR varies depending on the type of fuel and engine

• AFR testing can be done using a wideband oxygen sensor or a gas analyzer

I know various parameters related to chemistry such as temperature, pressure, concentration, pH, etc.

• Temperature

• Pressure

• Concentration

• pH

• Molarity

• Molality

• Density

• Viscosity

• Refractive index