The velocity of sound in the air (vacuum) is:

The instrument that measures and records the relative humidity of air is:

Which of the following produces more flame?

The best conductor of heat is?

On increasing the pressure on ice, what will be its melting point?

One horse power is equal to how many watts?

An iron needle floats on the surface of water. What is the reason for this phenomenon?

Which scientist first melted two pieces of ice by rubbing them together?