What is the first step before using a burette for titration?

• Fill the burette with distilled water.

• Rinse the burette with the titrant solution.

• Check the burette for cracks.

• Calibrate the burette using a standard solution.

• Clean the burette using soap and water.

What is the correct way to read the burette's volume?

• From the top of the meniscus at eye level.

• From the bottom of the meniscus at eye level.

• From any angle that is comfortable.

• From the middle of the meniscus at eye level.

• From the scale nearest to the meniscus.

How should you fill the burette with the titrant?

• Use a beaker and pour directly into the burette.

• Use a funnel and pour the solution carefully.

• Dip the burette into the solution container.

• Use a pipette to transfer the solution.

• Fill the burette directly from the stock solution bottle.

Why is it important to clean the burette immediately after use?

• To prevent the solution from drying and clogging the burette.

• To make it easier to use next time.

• To avoid errors in future titrations.

• To maintain the transparency of the burette.

• To comply with safety regulations.

When storing a burette, what is the recommended position?

• Horizontal, to avoid air bubbles.

• Vertical, with the stopcock closed.

• Upside down, with the tip open.

• Lying flat on a clean surface.

• Vertical, with the stopcock open.

Why should you avoid using tap water to clean your contact lenses?

• It can stain the lenses.

• It may cause irritation to the eyes.

• It contains harmful microorganisms.

• It can dissolve the lenses.

• It makes the lenses dry out quickly.

How long can you wear daily disposable contact lenses?

• Until they feel uncomfortable.

• For a maximum of 12 hours.

• Only once and then discard them.

• For one week if stored properly.

• For one month if disinfected regularly.

How often should you replace your contact lens case?

• Once a month.

• Every three months.

• Every six months.

• Once a year.

• Only when it is damaged.

Why should you avoid wearing contact lenses while sleeping?

• It makes the lenses uncomfortable.

• It can damage the lens case.

• It reduces the life of the lenses.

• It can cause dry eyes and increase infection risk.

• It will make your vision blurry in the morning.

What is the purpose of rubbing your contact lenses with solution during cleaning?

• To warm the lenses for comfortable wear.

• To prevent the lenses from drying out.

• To remove protein and dirt buildup.

• To disinfect the lens case.

• To reshape the lenses.