Chemistry X | Decomposition Reaction
Decomposition Reaction Activity Take about 2 g ferrous sulphate crystals in a dry boiling tube. Note the colour of the…
CHEMISTRY X | Combination Reaction
Combination Reaction Activity Take a small amount of calcium oxide or quick lime in a beaker. Slowly add water to…
Even JEE has mistakes in it
A senior IIT professor has pointed out ‘‘serious blunders’’ in this year’s IIT-JEE test that concluded on Sunday. He claims…
New MCQ (Multiple Choice Questions) Series
We have started this site to facilitate study material for CBSE students for classes from 9th to 12th. Since in…
Physics XI | Chapter 2 : Units and Measurements : Measurement of Large Distances
2.3.1 Measurement of Large Distances Large distances such as the distance of a planet or a star from the earth…
Physics XI | Chapter 2 : Units and Measurements : THE INTERNATIONAL SYSTEM OF UNITS
2.2 THE INTERNATIONAL SYSTEM OF UNITS In earlier time scientists of different countries were using different systems of units for…
Physics XI | Chapter 2 : Units and Measurements : INTRODUCTION
2.1 INTRODUCTION Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called…
CBSE XI | 1.5 NATURE OF PHYSICAL LAWS
1.5 NATURE OF PHYSICAL LAWS Physicists explore the universe. Their investigations, based on scientific processes, range from particles that are…
Physics XI | 1.4.5 Towards Unification of Forces
1.4.5 Towards Unification of Forces We remarked in section 1.1 that unification is a basic quest in physics. Great advances…
Physics XI | 1.4.4 Weak Nuclear Force
1.4.4 Weak Nuclear Force The weak nuclear force appears only in certain nuclear processes such as the p-decay of a…