The group of solar cells joined together in a definite pattern is called a

The study of origin and evolution of universe is known as ________.

If a ball is thrown up, which of the following does not change?

To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with:

It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because –

Tungsten is used for the manufacture of the filament of an electric bulb, because –

The reason of mirage is

Red light is used in traffic signals because

When a running car stops suddenly, the passengers tends to lean forward because of –

If a boy is sitting in a train, which is moving at a constant velocity throws a ball straight up into the air, the ball will –