Why should paper be saved ? Prepare a list of ways by which you can save paper.

Prepare a list of objects around you that are electroplated.

In an examination, the maximum marks for each of the three papers are 50. Maximum marks for the fourth paper are 100. Find the number of ways in which the candidate can score 60% marks in aggregate.

A substance X when heated with sulphuric acid liberates a gas which turns starch paper blue. The substance is

List conditions under which combustion can take place.

A person goes in for an examination in which there are four papers with a maximum of m marks from each paper. The number of ways in which one can get 2m marks is

In a Survey of 5,000 people in town, 2250 were listed as reading English News paper 1750 as reading Hindi News Paper and 875 were listed as reading both Hindi or English news paper. Find how many people do not read Hindi or English News paper. Find how many people only English Nes Paper.

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark again in focus ?