Understanding Physical Quantities and Measurements

What are the seven fundamental physical quantities?

• Speed, Volume, Pressure, Density

• Frequency, Acceleration, Torque, Mass Density

• Length, Mass, Time, Electric Current, Temperature, Amount of Substance, Luminous Intensity

• Force, Energy, Power, Work

Define a derived physical quantity and give an example.

• Mass is an example of a derived physical quantity.

• Speed is an example of a derived physical quantity.

• Distance is a derived physical quantity.

• Temperature is a derived physical quantity.

What is the SI unit for mass?

• kilogram

• ounce

• pound

• gram

How do you convert kilometers to meters?

• Add 1000 to the kilometers.

• Divide the kilometers by 1000.

• Subtract 1000 from the kilometers.

• Multiply the kilometers by 1000.

Name a common instrument used to measure temperature.

• hygrometer

• barometer

• anemometer

• thermometer

What does sensitivity refer to in measurement instruments?

• Sensitivity measures the overall accuracy of an instrument.

• Sensitivity refers to the ability of a measurement instrument to detect small changes in the measured quantity.

• Sensitivity indicates the maximum range of measurement.

• Sensitivity refers to the speed of the measurement process.

Explain the difference between accuracy and precision.

• Accuracy is about the number of attempts; precision is about the time taken.

• Accuracy is about correctness; precision is about consistency.

• Accuracy measures the average; precision measures the range.

• Accuracy is subjective; precision is objective.

What is the SI unit for force?

• Pascal (Pa)

• Watt (W)

• Newton (N)

• Joule (J)

How is the range of a measuring instrument defined?

• The range is the average of all measurable values.

• The range is the standard deviation of the measurements.

• The range is the minimum and maximum measurable values of the instrument.

• The range is the total number of measurements taken.

What instrument would you use to measure the volume of a liquid?

• Ruler

• Beaker

• Thermometer

• Graduated cylinder