Fact file

ü The first seismograph was made in china .The earthquake made the balls from the pot fall into the mouths of the frogs below.

ü The moon always shows just one side of it to the earth. The moon pulls does. So we would find it very difficult to walk on moon. Unless we are weighed down, we would float.

ü Evaporating sea water is the oldest method of obtaining salt. Sun’s heat evaporates the water & salt is left behind. The salt thus obtained is further purified to make it edible.

ü In a microwave oven, water particles in the food are made to move very fast .heat produced due to the friction between these water particles cooks the food.

ü Dolphins have the best sense of hearing among animals. Their hearing is 14 times sharper than in human beings.

ü Snakes use their tongue to smell things.

ü Talk, a mineral found in talcum powder, is the softest mineral.

ü Shark teeth are actually modified scales.

ü The flying fish is anabas. It is able to leap through the air for long distances. It flies with the help of two wing-like fins attached to either side of its body

ü Insects breathe with the help of a series of tiny holes along the side of their bodies. These holes are called spiracles.

Durga Devi Sharma

 B.sc 2nd year

Why does lightening occur when the thunder takes place in the atmosphere of earth?

Earth is supposed to be zero potential. Above earth surface, there is a vast atmosphere where there is flow of air. Whenever air moves nearby the ground, friction gets raised and electric charge is induced in the air. When there is loss of negative charge particle electron, air gets negatively charged. The same process goes on repeating. In a long run, air carries lots of negative charge in the form of the cloud. As we know there is always attraction between the negative and positive charge. We know the ground acts as a zero potential. Whenever the charge carrying cloud goes very near to the tall objects like tree or tower or hill, then the negative charge cloud induces the positive charge at the top of tall object. Slowly, there is attraction. As a result, negative charge come in contact with the positive charge and tremendous friction takes place. At the moment, great sound is produced which we call thunder and the electrical energy get changed into the heat and light. Since the light travels at very high speed, we see first light and only then the sound. We have so many misconceptions about the thunder and lightning. People think that the axe gets fell during the lightening which is not a fact. Actually, there is a flow of electric charge towards the ground with a very high speed and gets terminate at the zero potential of earth. We have developed the earthing so as to save our life from the dangerous situation of lightning and thunder.

Why does sound produce while clapping?

When we clap with our hands, kinetic and mechanical energy are changed into sound energy at that moment. When we clap with our two hands, the palms get very much closer all of sudden and the air between the palms gets compressed suddenly.  When we go clapping, it happens that the air sometimes gets compressed while other time it gets loosed. Which cause the friction and that friction takes the form of sound energy and reach up to our ear. According to the conservation of energy, the energy neither be created or nor be destroyed. Instead it changes its form from one to another. Here also, the kinetic energy due to the motion of our hands, change in to the sound.

Amazing Facts about Sex.

Did You Know…..

      I.            The average male produces several million new sperm daily, while a female produce no more than that throughout her lifetime. A man will ejaculate about 1 to 2 trillion sperm in his lifetime.

 II.            Unlike other cells, which contain an individual's full DNA, the egg of female and sperm of male each contain only half of the DNA required to reproduce a new human. A single cell contains 6 billion steps of DNA.

III.            Use of the condom was first noted in published literature in the early 1500A.D. It was originally made of linen, and historians believe the legendary lover Casanova used linen condoms. The first legalized condoms in the US were made from vulcanized rubber in the 1870A.D. They were expensive and annoyingly thick and meant to be reused. Today, Japan leads the world in condom use.

Perfect Numbers

A number which is equal to the sum of its divisors except itself:
1) 6 = 1+2+3
2) 28 = 1+2+4+7+14
3) 496
4) 8128