A Pen That Jumps Materials Required: A pencil A square of paper, 6 inch x 6 inch A tape rubber band A ballpoint pen with cap (as in the illustration) A pen can be made to jump back into its cap, as though pulled by a invisible hand, a magnet or a rubber band.  Take the pencil and roll a square of paper around it, like a tube about six inches...

A Hanging Pencil Materials Required: A pencil that has metal on the eraser A plastic cup with opaque sides A small magnet Hide a small magnet between your fingers and hold a plastic cup in the same hand. Having done so, turn the plastic cup upside down. With the other hand, insert the eraser end of the pencil into the cup. The pencil should be placed on the side, where the...

Conserving Electricity Materials Required: Paper and Pencil We use the appliances that we have at home, to reduce our workload, by a great extent. Little do we realize though that these appliances run on energy viz. electrical energy. Make a list of all the appliances that you have at your house and do not forget to add appliances like torches and portable radios, which run on batteries, which contain electric charges...

Convection and Temperature Materials Required: Two clear drinking glasses Water Bottle of red food colouring Bottle of blue food colouring A refrigerator When a body of air becomes warmer than the air around it, that body of air rises. It rises because it is lighter and less dense than the other. Warm air rises and cold air falls. When air flows this way, it’s called Convection. On a hot summer day,...

Saving Electricity Materials Required: Your Home Pencil and paper Electrical energy has been such a boon to mankind that we generally take its use for granted. We expect it to be there all the time and therefore pay no heed to it, until the time it is lost. The reasons for the loss of electrical power can range from a fault with the electric utility equipment, when strong winds can blow...

Water Purification Materials Required: An adult Smallest-size flat tuna can Salt Water Spoon Large, wide-mouth jar with lid A sunny window Use of refrigerator Most of the oceans and seas in the world are made up of salt water. When the water evaporates, what is left behind is salt. But is evaporated water still salty? Let us evaporate some salt water and check if it is still salty, or whether the...

Using Solar Cells Materials Required: Three hobby solar cells Small DC hobby motor Insulated jumper leads with alligator clips on each end Several wooden blocks The solar cell, also known as the Photovoltaic cell, has the ability to convert light into electricity. Due to the difficulty in manufacturing, they are used as the last resort to obtain electricity. It is only a ‘series’ of solar cells that can generate adequate electricity....

Trapping Solar Heat Materials Required: Five glasses of the same size Water Construction papers of different colors Adhesive tape Thermometer Energy from sunlight makes heat. Light from the sun is trapped when it hits an object, making it warm, but it bounces back after hitting something light. Take five glasses of water filled to the brim and wrap a black construction paper around one. Similarly, wrap a different colored paper around...