Question

Which of the following instruments measures time most accurately.
1. pendulum clocks
2. sundial
3. quartz watch
4. an hour glass

The basic unit of speed in SI unit is.
1. km/h
2. m/min
3.m/s
4. km/min
​

Answer 1

Answer:

(1) Option 3 Quartz Watch.

(2) Option 3 Metre per sec (m/s)

:D