question_answer

Which one of the following statements is correct for measuring the length of an object by using a ruler?

A) Ruler should be placed away from the object whose length is to be measured.

B) Worn out portions of the ruler should be used for measuring.

C) There should be a gap of at least 4 cm between the ruler and the object whose length is to be measured.

D) All the above

E) None of these