C2: Measurements (I)

Which is the symbol for mass?

• g

• m

• M

• kg

What is the SI unit for mass?

What is the time shown on the digital stopwatch?

• 1.58 seconds

• 118 seconds

• 1.58 minutes

• 158 minutes

Answer explanation

1:58 = 1 min 58 s = 60 + 58 = 118 s

1:58 is not the same as 1.58.

1.58 min = 1.58 of a minute = 60 + (0.58)(60) = 94.8 s

Another example:

1.50 min = 1 min 30 s

1:50 = 1 min 50 s

A piece of cotton is measured between two points on a ruler.

When the length of cotton is wound closely around a pen, it goes round six times.

What is the distance once around the pen?

What is 7.5 mm in metres?

Which instrument is most appropriate for measuring a diameter of a thin piece of wire?

• digital caliper

• measuring tape

• metre rule

Which instrument is most appropriate for measuring the mass of a brick?

• electronic balance

• electronic weighing scale

• weighing machine

• weighing scale

What is the reading shown on the thermometer here? (Write the numerical value)

........... °C

What is the volume of the liquid in cm³?

(Write the numerical value)

What is the precision of a laboratory thermometer?

• 0.01

• 0.05

• 0.1

• 0.5