Lakhmir Singh and Manjit Kaur Solutions for Chapter: Motion and Time, Exercise 1: Very Short Answer Type Questions

How many seconds are there in one hour?

Name the device whose periodic motion was used for making clocks till recently. (Sundial/ Simple Pendulum/ Hourglass)

What name is given to the metallic ball of a simple pendulum?

What is the smallest time interval which can be measured accurately with commonly available clocks and watches?

(Choose from: $1 \mathrm{second}$/$1 \mathrm{minute}$)

Which of the two is a bigger unit of time?

Which of the two measures time more accurately?

Which of the two requires an electric cell for its working?

A bus takes $30 \mathrm{minutes}$ to travel a distance of $25 \mathrm{kilometres}$. Calculate the speed of the bus in $\mathrm{k}\mathrm{m}/\mathrm{h}.$