CALORIMETRY INTRODUCTION: Heat is a kind of energy that make a substance colder or
Introduction: When electric current is passed through conducting liquids, then chemical changes take place.
FRICTION INTRODUCTION: When one body moves over the surface of the other, the surface
A lens is a transparent refracting medium bounded by two or at least one spherically
INTRODUCTION: In day-to-day life, we consider any useful physical or mental labour as work. Activities