Question 1

Which type of laboratory glassware is specifically designed for highly accurate measurements and is manufactured with strict standards?

Accepted Answer

Volumetric flasks

Question 2

A student needs to measure 10 mL of a reagent with the highest possible accuracy. Which piece of labware should they use?

Accepted Answer

Volumetric pipette

Question 3

Why is it important to always inspect glassware for chips or cracks before use in the laboratory?

Accepted Answer

Broken glassware poses a safety hazard and can lead to injury or contamination.

Question 4

Which of the following statements about 'to contain' (TC) and 'to deliver' (TD) pipettes is correct?

Accepted Answer

TC pipettes are calibrated to contain a specific volume, but some liquid may remain on the walls after delivery.

Question 5

A laboratory technician is preparing a buffer solution for a quantitative analytical procedure. Which type of laboratory reagent water should be used?

Accepted Answer

Type I reagent water

Question 6

Which of the following is a disadvantage of using plasticware instead of glassware in laboratory analyses?

Accepted Answer

Plasticware may be attacked or degraded by certain chemicals, affecting results.

Question 7

During centrifugation of blood samples, what is the correct procedure if tube breakage occurs?

Accepted Answer

Leave the lid closed for 30 minutes to reduce aerosol risk, then decontaminate following safety protocols.

Question 8

Which equation best describes the relationship between centrifugal force ($$F_c$$), mass ($$m$$), radius ($$r$$), and angular velocity ($$\omega) in a $$centrifuge?

Accepted Answer

$$F_c = m \$$omega^2$$ r$$

Question 9

A researcher needs to store Type II reagent water for later use. Which of the following is the best practice?

Accepted Answer

Store in borosilicate glass or polyethylene bottles, tightly stoppered to prevent contamination.

Question 10

Which laboratory device is used to sterilize items by heating them under pressure, typically at $$121^\circ C$$ and 15 psi for 20 minutes?

Accepted Answer

Autoclave

Question 11

A student is using a manual pipette to transfer liquid. What is the correct technique for ensuring accurate measurement?

Accepted Answer

Fill above the top graduation, adjust the meniscus to the calibration mark at eye level, and release liquid vertically.

Question 12

Which purification method for laboratory water involves passing water under pressure through a semipermeable membrane?

Accepted Answer

Reverse osmosis

Question 13

Why should acids and bases be stored separately in a laboratory?

Accepted Answer

To avoid dangerous chemical reactions and ensure safe storage.

Question 14

Which type of glassware is most suitable for heating substances due to its resistance to thermal shock?

Accepted Answer

Borosilicate glass

Question 15

A laboratory technician is preparing a reagent and needs to ensure the entire measured substance is transferred for dilution. What is this process called?

Accepted Answer

Quantitative transfer

Question 16

Which of the following is NOT a recommended safety precaution when using laboratory centrifuges?

Accepted Answer

Stop the centrifuge with your hand while it is spinning.

Question 17

Which laboratory water type is most appropriate for washing or rinsing glassware?

Accepted Answer

Type III reagent water

Question 18

A laboratory is using a ready-made immunoreagent kit for a diagnostic test. What must be maintained to ensure reliable results?

Accepted Answer

Quality control protocols must be followed.

Question 19

Which of the following is a critical measurement in laboratory practice?

Accepted Answer

Using a volumetric pipette to measure a precise volume

Question 20

Which laboratory device is used to maintain a constant temperature for biological samples and must be monitored daily with a calibrated thermometer?

Accepted Answer

Incubator

Laboratory Equipment and Labware: Types, Use, and Safety in General Biology

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