What has been chosen as the standard unit of length? Where is the sample of unit length kept at? Describe a correct method of measuring length.

Distinguish between periodic and non-periodic motion.

How should we be careful while taking readings on a scale with the zero mark broken?

Look at the given picture of a pond. Consider the plant as a fixed object and list four objects each

(i) at rest, and

(ii) in motion.

Thousand times of a metre.

Name the following: Motion in a straight line.

(Choose from the following: Rectilinear motion/ Rotational motion)

A motion which is repeated after different intervals of time. (Non-periodic motion/periodic motion)