Question

1)the earliest method of measuring time were based on ---------------of events
2)______clock is the most accurate clock
3)we use the idea of speed to distinguish between_____and____objects
4)the graph plotted between distance and time for the uniform motion is always in ____

Answer 1

1) periodic.
2) Atomic.
3) stationary and moving objects.
4) straight line.

Answer 2

Answer:

sun dial , sand dock , water dock