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Science and Technology

What is Force,Work,Energy and Power?

Force is a physical quantity which when applied to a body tries to displace or displaces it. This quantity is equal to the product of the mass of the body and its acceleration. The unit for measuring force is Newton or Dyne…. [… More info ..]

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Science and Technology

How can we Extinguish Fire?

A fire is basically a chemical reaction during which heat and light are produced. Three factors are necessary for a fire to start – Fuel oxygen or air and heat to raise the temperature of the fuel to its ignition temperature….. [… More info ..]

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Science and Technology

How are different Dyes made?

Dyes are colour substances which impart their colour to the fabrics on which they are applied and for which they have a chemical affinity. Until the middle of the last century the dyes available were natural products obtained…. [… More info ..]

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Science and Technology

What is Dry Cleaning?

Dry cleaning is method of cleaning fabrics with chemical solvents instead of soap and water. Petrol is the most important of them. Benzene is also used in dry cleaning. Some safer synthetic chemicals such as polychloroalkanes and alkanes have also been developed…. [… More info ..]

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Science and Technology

What is Doppler Effect?

When we hear the sound of a police car speeding past us with its siren blaring or a train roaring past another tain we experience something strange happening to the pitch of the sound. The sound seems to get higher as the car approches and lower as it goes past…. [… More info ..]

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Science and Technology

What are different types of telescopes?

A telescope is an optical instrument used to see distant objects clearly and magnified. The telescope was invented in 1608 by a Dutch optician Hans Lippershey. In 1609 the italian astronomer Galileo made his first telescope and observed the rings of saturn and jupiter’s moon….. [… More info ..]

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Science and Technology

How do Detergents perform the Cleaning Action?

The first detergent was developed was in 1916 by a German scientist called Fritz Gunther. Since then their use has been on the constant increase. A Detergent is an organic substance composed of carbon, oxygen sulphar and hydrogen compounds. When combined with water it helps to clean soiled materials…. [… More info ..]

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Science and Technology

What are the Contact Lenses?

The first contact lenses to be used as an eye aid were made by A.E. Fick in 1887. These early lenses were first made by blowing the glasses and then by grinding and polishing bottoms of glass test tubes. These lenses were not successful and for a long time remained just a subject of academic study…. [… More info ..]

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Science and Technology

What is Compact Disk?

Compact Disc is a new kind of disc which is recored and plated by laser beam. Compact Disc has silvery, mirror-like surfaces which reflect lingt in a rainbow spectrum. The laser Disk has a very reflective metallic surface, covered by a protective coating of clear plastic…. [… More info ..]