Synthetic fibres and Plastics -10 Multiple Choice Questions

synthetic

Synthetic fibers and plastics are alternatives to cotton which is a natural fibre obtained from the cotton plant.Synthetic fibres are manufactured by a number of processes using  petrochemicals. A polymer is made up of many repeating units called monomers.In contrast , the natural cotton ,  is a form of polymer called cellulose, which is made of a large number of glucose units.Characteristics of synthetic fibers: Test Your Knowledge on Synthetic fibres and Plastics [viral-lock message="After you LIKE [...]

Test Your Knowledge on Physics-Friction

friction

The subject of friction is an important one as many an invention is based on the fundmental principle of friction . The science of Friction is part of physics. Friction opposes the relative motion between two surfaces in contact. The force of friction is greater if a rough surface is involved,  as the number of [...]

Test Your Knowledge on Microorganism -Friend or Foe -Class VIII CBSE

microorganism

A microorganism is a very tiny living organism . They are so small that hundreds of thousands of bacteria could fit onto a pinhead.The microorganisms in and on our bodies are protozoa, algae, fungi, bacteria and viruses. Most of them  are beneficial but some are also dangerous.For example, there are microorganisms in our large intestine that synthesise vitamins and allow them to be absorbed into the bloodstream. However, a tiny [...]

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