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Frictional Electricity The word electricity is derived from the Greek word electron which means amber. In the sixth century BC,…
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Frictional Electricity: The word electricity is derived from the Greek word 'electron' which means amber. In the sixth century BC,…
Physics XI | Frame of Reference
Frame of Reference: Suppose someone asked you a question “How far is India?” your reaction would be “from where?” Then…
Physics XI | Rest and Motion
Rest and Motion What is motion? An object is said to be in motion if it changes its position continuously…
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REFLECTION OF LIGHT A highly polished surface, such as a mirror, reflects most of the light falling on it. You…
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EVOLUTION SHOULD NOT BE EQUATED WITH ‘PROGRESS’ In an exercise of tracing the family trees of species, we need to…
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Evolution by Stages A question that arises here is – if complicated organs, such as the eye, are selected for…
Biology X | Heredity and Evolution | Fossils
Fossils Such studies of organ structure can be done not only on current species, but also on species that are…