introduction of science 1

when a ray of light travelling in one medium enters another medium of different optical densit..

Electricity is one of the most important sources of energy. Lights, fans, motors, radios and television are some common appliances which work on electricit..

We have learnt that a force changes or tends to change the state of rest, speed or direction of motion of an object, i.e., force produces an acceleration. In this chapter, we are going to identify one of the forces which produces acceleration in all objects on the surface of the Earth irr..

Man is surrounded by an ocean of energy but he has been able to tap only a fraction of it. The most colossal dynamo of all energy is the sun, an unimaginable vast powerhouse which affects everything on earth. But then, why do we hear about energy crisis? We know that energy can be converted from h..

Every organism whether plant or animal is unique in itself. There is a wide diversity in the flora (plants) and fauna (animals) in the world. The diversity we see today is the result of 3.5 billion years of organic evolution. During the course of this evolution several species vanished from the sur..

In the previous chapter we have seen how light gets reflected when it is incident on a surface. Now let us see what happens when a ray of light travelling in one medium enters another medium of different optical density. It is a matter of common experience that a spoon placed in a gl..

Appliances used in our day to day life are based on the principles of electricity and magnetism. Electricity is one of the most important sources of energy. Lights, fans, motors, radios and television are some common appliances which work on electricity. Historically, it was friction..

Introduction - We have learnt that a force changes or tends to change the state of rest, speed or direction of motion of an object, i.e., force produces an acceleration. In this chapter, we are going to identify one of the forces which produces acceleration in all objects on the..

Introduction - In the physical world, one of the most common phenomena is motion. The branch of Physics, which deals with the behaviour of moving objects, is known as mechanics. Mechanics is further divided into two sections namely Kinematics and Dynamics. Kinematics deals with ..

Introduction - Once, a very beautiful actress met the famous English playwright, George Bernard Shaw. She wanted to propose to him and whispered, "Will it not be wonderful if our child has my beauty and your brains?" To this Bernard Shaw retorted, "What if the child has your brains and my..