Materials for rain-proof coats and tents owe their water proof properties to 

In the human body, fats are stored in the 

An element that does not occur in nature but can be produced artificially is 

The 'Greenhouse effect' is produced due to the presence of excess amount of  

Which of the following is biodegradable? 

Acid rain is caused due to pollution of atmosphere by 

A mixture of water and alcohol can be separated by 

Energy possessed by a body due to its stationary is called its