Instruments are in different keys because the length and size of the instrument affect the pitch it produces. Instruments in different keys are designed to play in specific ranges of notes that are most comfortable and sound best for that particular instrument.
There is no instrument on that list that can take any reliable measurements.
Reaction time might significantly affect measurements when using instruments in experiments that require quick responses, such as timing a pendulum swing or recording the onset of a chemical reaction. To minimize its impact, one could practice and familiarize oneself with the instrument and task, automate measurements where possible, and use software or tools that synchronize data collection with the start of the event.
Different instruments may be used for measuring to provide greater accuracy, cover a wider range of values, or measure different aspects of a quantity. Each instrument may have its strengths and limitations, so using multiple instruments can help ensure more comprehensive and precise measurements.
They depend on the design of the instrument.
"Metric" is a whole system of weights and measurements. Many different devices are used to measure things in the system.
the precision of the least precise measuement
They are liquid measurements of different magnitude.They are liquid measurements of different magnitude.They are liquid measurements of different magnitude.They are liquid measurements of different magnitude.
The same reason everyone else uses instruments, for music or for testing and measurements, depending on what type of instruments you are talking about.
A frame of reference is the perspective from which an observer views a situation. It can affect observations and measurements by influencing how distances, velocities, and other physical quantities are perceived and calculated. Different frames of reference can lead to different interpretations of the same event or phenomenon.
They are made using appropriate tools or instruments.
The disadvantage of using a voltmeter and ammeter on circuit measurements is that internal burden in both these instruments can affect circuit operation so much as to make a measurement useless.