A student wants to measure the outer diameter of a cylindrical wooden rod as accurately as possible. Which combination of apparatus should be used to obtain this measurement?
a ruler and a piece of thread
a ruler and two rectangular wooden blocks
a measuring cylinder and some water
a protractor and a set square
164 exam-style questions on CIE IGCSE Physics Physical quantities and measurement techniques, covering Physical quantities and measurement techniques. Each one has a worked solution and a mark scheme showing where the marks go.