The most abundant element in the earth's crust is 

An example of natural polymer

A small metal ball is suspended in a uniform electric field with the help of an insulated thread. If high energy X-ray beam falls on it.

One of the following is not a criteria for the award of 'Green School Award'. Find it out 

The botanical name of Seemai Karuvel is 

Who is the author of the book "The D Word"