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Corrosion of Metals - We have learnt that metals that are chemically active get corroded in the presence of a moist atmosphere. Corrosion is an oxidation reaction with atmospheric oxygen in the presence of water on the surface of a metal. Iron corrodes more quickly than most other transition metals..

>When the intervals are unequal, we construct each rectangle with the class interval as the base and frequency density as the height. Frequency density In the above example, take second class interval, its frequency density Similarly for the last interval, the frequency densi..

. Such series demonstrate as to how various forms of life have changed gradually over a period of millions of years. As a result, the evolution of a number of animals such as horse, camel and elephant, has been clearly understood. Plenty of fossil evidence is now available so as to establish human ..

Question: In the figure, ABC and DBC are two triangles on the same base BC. If AD intersects BC at O, then prove that [3 Mark] Answer: Construction: Draw AE BC and DF BC Proof: ..

Formation of Image by a Plane Mirror - Ray Diagrams - The following rays are usually considered while constructing ray diagrams: A ray of light incident on a plane mirror at 90 degree gets reflected from the mirror along the same path. A ray of light falling on a plane mirror at any angle..

Enlargement or Dilatation - Let us construct Take any point x. Join XA, XB, XC and produce them to points P, Q, R respectively, such that XP = 3XA XQ = 3XB XR = 3XC Join PQ, QR and PR The sides of the are three times the corresponding sides of The sides of t..