Which of the following is not correctly matched?

Why does a solid chunk of iron float in mercury but sink in water?

Lambert's law is related to–

Which one of the following is used to remove Astigmatism for a human eye?

Velocity of the sound is minimum in-

Water Turbine was invented by ________ .

1 unit of Newton is equal to

What component is traditionally used to regulate the speed of a ceiling fan?

The instrument for measuring intensity of earthquakes is called –

The Atom Bomb dropped in Nagasaki is an uncontrolled nuclear fission made up of:

Speed of sound in air is unaffected by change in :