Question

The given figure shows a ruler represented in millimeters (mm). It is used to measure the length of the pencil. Determine the length of the pencil in centimeters.

• A. 0.75 cm
• B. 75 cm
• C. 7.5 cm
• D. 0.075 cm

Answer 1

The correct option is C 7.5 cm

The relationship between the SI unit and other units of length are:
1 mm = 0.001 m
1 cm = 0.01 m
1 dm = 0.1 m
1 km = 1000 m
Here, the length of the pencil measured in (mm) is 75 millimetres. The relation between millimetre and centimetre is 1 mm = 0.1 cm. Thus, 75 mm $=0.1\times 75cm=7.5cm$