Which instrument is used to transfer small amounts of liquid by drawing up into a small tube and releasing?

Which instrument is used to transfer small amounts of liquid by drawing up into a small tube and releasing?

• A. Pipette Pump blue
• B. Medicine Dropper
• C. Pipetting Bulb
• D. Pipette Filler-Dispenser

Answer: (B)

The concept being tested is identifying a device that transfers small amounts by drawing liquid into a tube and releasing it by squeezing. A medicine dropper fits this description perfectly. When you squeeze the rubber bulb, you push air out; releasing creates suction that draws liquid into the narrow tube. Squeezing again releases the liquid, typically in drops. This simple mechanism is ideal for dispensing small, variable amounts without requiring precise volume measurement. Other tools like those used with pipettes are designed for precise volumes via air displacement and calibrated tips, which is more than what a dropper provides. Droppers are favored for quick, casual transfer of small amounts where exact precision isn’t needed.

The concept being tested is identifying a device that transfers small amounts by drawing liquid into a tube and releasing it by squeezing. A medicine dropper fits this description perfectly. When you squeeze the rubber bulb, you push air out; releasing creates suction that draws liquid into the narrow tube. Squeezing again releases the liquid, typically in drops. This simple mechanism is ideal for dispensing small, variable amounts without requiring precise volume measurement.

Other tools like those used with pipettes are designed for precise volumes via air displacement and calibrated tips, which is more than what a dropper provides. Droppers are favored for quick, casual transfer of small amounts where exact precision isn’t needed.