Apparatus

Which type of balance is most accurate for weighing small masses (up to ±0.001 g)?

• A. Mechanical balance

• B. Auxiliary balance

• C. Analytical electronic balance

• D. Triple beam balance

What is the standard temperature for volumetric glassware calibration?

• A. 10°C

• B. 20°C

• C. 25°C

• D. Room temperature

Which type of pipette delivers one fixed volume accurately and is bulb-shaped?

• A. Serological pipette

• B. Graduated pipette

• C. Mohr pipette

• D. Volumetric pipette

Which reagent cleaning solution is made from sodium dichromate and sulfuric acid and is very hazardous?

• A. Aqua regia

• B. Warm detergent

• 
  C. Dichromate-sulfuric acid solution
  

• D. Nitric acid

The ____________ technique is preferred for hygroscopic solids to avoid moisture uptake during weighing.

Which type of water is suitable for ultra-trace analytical techniques like HPLC?

• A. Tap water

• B. Grade 3 water

• C. Grade 2 water

• C. Grade 2 water

Why should pipettes be rinsed with the solution they will transfer before use?

• A. To prevent contamination

• B. To lubricate the pipette

• C. To warm the pipette

• D. To clean the outside

What is the primary function of a desiccator in a laboratory?

• A. To sterilize labware

• B. To weigh samples

• C. To remove impurities from water

• D. To keep samples dry and moisture-free

Which marking on volumetric glassware indicates it is calibrated to contain a specific volume?

• A. TD

• B. TC

• C. TDC

• D. TV

Which of the following is a correct safety practice when using an analytical balance?

• A. Place the balance near an open window for ventilation

• B. Use fingers to transfer chemicals to the weighing pan
  
  

• C. Weigh chemicals directly on the balance pan

• D. Ensure the balance is on a stable surface away from drafts