Physical Quantities and Measurement Worksheet

Physical quantities are:

• quantities that can be measured and expressed with a number and a unit.

• quantities that cannot be measured.

• only numbers without units.

• only units without numbers.

Similar signs as shown in Figure 1.1 (sign showing clearance limit under a bridge) can also be found in which of the following places?

• At the entrance of tunnels

• At pedestrian crossings

• At bus stops

• At traffic lights

When using a metre rule to measure length, you must be careful to avoid parallax error.

• True

• False

When measuring short distances such as 1 ________ 1 000 000 of a metre, we simply express it as one micrometre. Thus, 0.000 001 m can be expressed as 0.01 mm (micrometre), where μ represents the submultiple 10⁻⁶.

• micrometre

• millimetre

• centimetre

• nanometre

What is the SI unit for length?

• metre

• second

• kilogram

• ampere

What is the smallest unit on a metre rule?

• 1 mm

• 1 cm

• 5 mm

• 1 inch

To avoid errors in measurement when using a metre rule, one should:

• Ensure your eye is at the same level as the measurement marking

• Use the metre rule only in the dark

• Measure from the end of the rule regardless of the zero mark

• Hold the rule at an angle to the object

Physical quantities that have magnitude only are called scalar quantities, while those that have both magnitude and direction are called vector quantities.

• Scalar quantities have magnitude only, and vector quantities have both magnitude and direction.

• Vector quantities have magnitude only, and scalar quantities have both magnitude and direction.

• Both scalar and vector quantities have only magnitude.

• Both scalar and vector quantities have both magnitude and direction.

Distance is a scalar quantity and displacement is a vector quantity because:

• Distance has only magnitude, while displacement has both magnitude and direction.

• Distance and displacement both have only magnitude.

• Distance has both magnitude and direction, while displacement has only magnitude.

• Both distance and displacement have only direction.

Scalars, such as distance and speed, have magnitude and no direction.

• True

• False