Chapter one review questions

What is a physical quantity?

•  A qualitative property of an object.

• A measurable property of a phenomenon or body.

• A unit of measurement.

• A mathematical equation.

Which of the following is a basic physical quantity?

• Area

• Velocity

• Mass

•  Force

What is the SI unit of time?

•  Hour

• Minute

• Second

• Day

What is the process of comparing a physical quantity with a standard called?

• Calculation

• Estimation

• Measurement

• Approximation

Which of the following is a derived physical quantity?

• Length

• • Time

• Mass

• Volume

What is the uncertainty in a measurement?

• The exact value of the measurement.

• The range of possible values of the measurement.

• The error in the measuring instrument.

• The standard deviation of the measurements.

What is a scalar quantity?

• A quantity that has both magnitude and direction.

• A quantity that has only magnitude.

• A quantity that has only direction.

• A dimensionless quantity.

What is a vector quantity?

• A quantity that has both magnitude and direction.

• A quantity that has only magnitude.

• A quantity that has only direction.

• A dimensionless quantity.

How can vectors be added graphically?

• By multiplying their magnitudes.

• By subtracting their magnitudes.

• By placing the tail of one vector at the head of the other.

• By drawing a perpendicular line between the two vectors.

What is the parallelogram law of vector addition?

• The resultant of two vectors is the sum of their magnitudes.

• The resultant of two vectors is the difference of their magnitudes.

• The resultant of two vectors is the diagonal of the parallelogram formed by the two vectors.

• The resultant of two vectors is the perpendicular bisector of the line joining their tails.