Who was the inventor of Radar?

Solar radiation is measured by_____?

Relative humidity is measured by____?

Transformer is used____?

Who developed the atom bomb?

Who was the inventor of telescope?

Who gave the first experimental value of G?

Ultrasonics are sound waves of frequency lies______

Who was the inventor of lightning conductor?

_______ Particles has the least penetrating power?

Atom bomb is based on the principle of_____?