Measurement of Length

A girl uses a rule to measure the length of a metal rod. Because the end of the rule is damaged, she places one end of the rod at the 1 cm mark as shown.

How long is the metal rod?

• 43 mm

• 46 mm

• 53 mm

• 56 mm

Which of these is a fundamental quantity?

• weight

• force

• distance

• work done

The diagram shows part of a vernier scale.

What is the reading on the vernier scale?

• 6.50 cm

• 6.55 cm

• 7.00 cm

• 7.45 cm

Which of these represents a reading taken by a meter rule?

• 21.25 cm

• 3.225 mm

• 7.9 cm

• 6.24 5 m

Which of these is not a derived quantity?

• force

• area

• temperature

• pressure

which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a tube?

• a meter rule

• a pair of calipers

• a micrometer screw gauge

• a tape rule

Which of these is a fundamental quantity?

• Density

• energy

• speed

• length

Which of these is a derived unit?

• Ampere

• kilogramme

• second

• watt

In an experiment, a ball is rolled down a curved track that is about half a metre long.

Which measuring device should be used to measure the length accurately?

• metre rule

• micrometer

• tape measure

• vernier calipers

Vernier calipers read to one tenth of a millimetre.

Which reading shows this precision?

• 3.3 cm

• 3.31 cm

• 3.310 cm

• 3.312 cm