Which is the second most abundant element in the universe? 

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

A steam engine converts the heat energy of steam into ______.

What is the scientific name of Banyan Tree? 

What is the chemical composition of Red Lead? 

The ozone layer in the atmosphere is at a height of about

The amount of light entering the eye is controlled by which of the following organs? 

Some tips and related energy conversions are given below?
(i) Electrical Generator - Electrical from Mechanical
(ii) Electric motor - electro-to-mechanical
(iii) Diesel engine - electric from light
(iv) Solar cells - chemical to mechanical
Which of the above pairs is related to it?