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WorksheetsApparatus
Total questions: 10
Worksheet time: 6mins
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 (a) 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
