The water from a hand pump is warm in winter because______
Ball pen function on the principle of _____.
Which of the following quantities is the measure of ‘inertia’?
The sky appears blue because______.
When a light wave is reflected from a mirror, there is a change in its
An object which absorbs all colours and reflects none appears is ______.
A small drop of oil spreads over water because :
Pressure cooker is fast in cooking rice because
Who was the first person to measure the speed of light?
One finds it more difficult to walk on ice than on a concrete road because
