What is a scalar quantity?

• A scalar quantity is a quantity that changes over time.
• A scalar quantity is a vector quantity.
• A scalar quantity is a physical quantity that has both magnitude and direction.
• A scalar quantity is a physical quantity that has only magnitude and no direction.

What is a vector quantity?

• A vector quantity is a quantity that has both magnitude and direction.
• A vector quantity is a quantity that has magnitude but no direction.
• A vector quantity is a scalar quantity.
• A vector quantity is a quantity that has only magnitude.

Which of the following lists only vector quantities?

• Energy, mass, force

• Energy, mass, power

• Velocity, force, acceleration

• Velocity, power, acceleration

A plumber needs to measure the internal diameter of a water pipe as accurately as possible.

Which instrument should be used?

• measuring tape

• metre rule

• micrometer

• vernier calipers

The diagram shows a micrometer scale. Which reading is shown?

• 5.64 mm

• 7.14 mm

• 7.16 mm

• 7.64 mm

Answer explanation

Reading = 7.5 + 0.14 = 7.64 mm

What is the length of the feather?

• 19 mm

• 29 mm

• 19 cm

• 29 cm

What is the volume of the water?

• 47.0 cm3

• 47.5 cm3

• 49.0 cm3

• 49.5 cm3

A cylindrical can is rolled along the ruler shown in the diagram.

The can rolls over twice.

What is the circumference (distance all round) of the can?

• 13 cm

• 14 cm

• 26 cm

• 28 cm

Answer explanation

Difference = 28-2cm = 26cm

Since the can rolls twice, 26/2 = 13cm

The diameter of a copper wire is thought to be approximately 0.3mm.

Which instrument should be used to obtain a more accurate measurement of the diameter of the wire?

• Ruler
• Measuring tape

• Metre rule

• Micrometer

Which diagram shows the resultant vector R of these two forces?

• 
• 
• 
• 

Answer explanation

Use the parallelogram law to add vectors 3N and 4N to obtain the resultant.