1. What is the best way to prevent contamination when transferring liquids?

Use your handsUse a pipette or a syringeUse an open containerNone of the above

2. Which tool is essential for accurate measurements of small liquid volumes?

BeakerGraduated cylinderMicropipetteTest tube

3. What can be done to prevent spilling when using a centrifuge?

Overload the centrifugeEnsure all lids are secured tightlyLeave the lid openUse the highest speed setting

4. When should you use a fume hood?

When mixing solid reagentsWhen working with volatile chemicals or fumesWhen using distilled waterWhen measuring solids

5. What is the purpose of using a water bath in experiments?

To cool down samplesTo maintain a stable temperature for reactionsTo dissolve solidsTo sterilize equipment

6. How can you efficiently clean glassware?

Rinse with water onlyUse detergent and hot waterUse a paper towelUse only a sponge

7. What is a common method for ensuring accurate pipetting?

Use a pipette that has not been calibratedPre-wet the pipette tipUse a very slow speedAvoid using the stop button

8. Which of the following is a good practice for storing chemicals?

Store all chemicals in the same cabinetLabel all containers clearlyLeave containers unsealedStore flammable materials near heat sources

9. What is the best way to handle glassware to avoid breakage?

Use excessive forceCarry multiple items at onceHandle with care and avoid sudden movementsUse your elbows

10. When is it appropriate to use a balance?

Only when weighing solidsFor both solids and liquids, as neededOnly when measuring large quantitiesWhen you feel it's necessary