Mention any two important properties of lasers.

The figure showing discharge tube experiment with perforated cathode is shown below: Mention any two properties of each rays.

Write any two important uses of noble gas elements.

The quest for finding out the complete DNA sequence of human genome lead to a mega project called HGP. Mention any four important goals of HGP.

Vapour pressure is an important property of liquids. pressure cooker is used for cooking food at higher altitudes. Give reason.

Vapour pressure is an important property of liquids . Pressure cooker is used for cooking food at higher altitudes. Give reason.