Noise pollution measured in:

Which layer protects earth from harmful rays of the Sun?

Which is the absolute temperature scale?

What are metal bearing rocks called?

The percentage of oxygen present in air is approximately

Newton is the unit of:

Acid turns blue litmus paper into which color?

Which of the following enzymes is not present in the human stomach?

Which of the following gland is present in the human mouth?

What is the basic unit of our neural system?