Inian and Ezhilan argue about the light year. Inian tells that it is 9.46 × 10¹⁵ m and Ezhilan argues that it is 9.46 × 10¹² km. Who is right? Justify your answer.

Find the thickness of a five rupee coin with the screw gauge, if the pitch scale reading is 1 mm and its head scale coincidence is 68.

Explain a method to find the thickness of a hollow tea cup.

Find out any ‘ten words’ related to measurement from the grid

Calculate the diameter of the sphere which is shown in the Figure. Assume the scale has no zero error.