The most abundant metal in the earth's crust is:

Telephone was invented by:

Our immunity system is based on:

Which gas do plants exhale during night?

Study of living things on other planets is called?

Hepatitis C is the Disease of:

Diabetes is caused due to the deficiency of:

Fear of bathing is called:

Solder is an alloy of:

Which mammal can fly?

Which planet is known as the Red Planet?

Which vitamin deficiency causes night blindness?

Compass is used for:

Which vitamin is responsible for blood clotting?

Rickets is a disease due to deficiency of vitamins. It is related to:

1 Horse Power is equal to:

Which among the following is a good conductor of electricity?

A longsighted person cannot see:

Which is the largest organ of the human body?

The Earth is the _________ largest planet of the Solar System.

Birds are: