7. Estimate the length of this page of your book in the following ways:
(i) by just looking at it (i.e., seeing)
(ii) with the help of your fingers
(iii) by using your ruler (in cm)

8. Why were the clocks of early times inconvenient to use?

9. Why do we need a suitable oil while determining the volume of a piece of rock salt using a graduated cylinder?

10. How many cm3 will be there in one litre?

11. What is the shape of the meniscus of milk in a cylinder?

12. What is the volume of a sphere of radius 7 cm?