Question

While measuring the length of a steel needle, the reading of the scale at one end is 3.0 cm and at the other end is 44.2 cm. Determine the length of the needle.

• A. 41.2 cm
• B. 4.12 cm
• C. 412 cm
• D. 4.12 m

Answer 1

The correct option is A

41.2 cm

To calculate the length of the needle we have to subtract the reading at one end from the reading at the other end. Since, 44.2 cm greater than 3.0 cm we subtract 3.0 cm from 44.2 cm. This gives use, 44.2 - 3.0 = 41.2 cm. So the required length of the steel needle is 41.2 cm.