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The technological development of any society is very closely related with the application of physics and other branches of science. The study of heat and thermodynamics is one of the main initiators of the industrial revolution. Today we see the applications of physics in eve..

The equilibrium established between two physical forms of a chemical substance, is called physical equilibrium, viz. change of water into vapour at normal temperature in a closed vessel. Water and vapour are same as chemical substance but their physical forms are liq..

Consider water kept in a closed vessel at a given temperature. Water in the vessel will evaporate with time and form water vapour. Concentration of water vapour over water surface will increase gradually. After some time, the molecules of vapour will be transformed into water due to mutual attrac..

1. Physical state : Pure acetic acid is a colourless liquid. 2. Odour : Characteristic pungent smell. 3. 3oiling point: It boils at 118C...

1) The boiling points of haloalkanes are in the order RF < RC1 < RBr < RI, The change in physical state is due to increase in van der Waal's forces between the molecules. These forces increase with increase in molecular mass. 2) Among the isomeric alkyl halides, the bo..

Physical Properties 1. Sulphur is a pale yellow solid. 2. It exists in different allotropic forms. 3. It is insoluble in water but soluble in carbon disulphide. 4. It melts at 114 C and boils at 444C 5. It does not conduct heat or electricity. Sulphur exists in t..

">The above investigations helped Watson and Crick to design a model of DNA molecule in 1953. Incidently, the conclusions of Watson and Crick and the findings of Wilkins and his associates were published in the same issue of the British journal "Nature 4 ". Just 1-page paper of Watson and..

> 33. The electric meter used in our house actually measures a) current strength b) energy c) voltage d) resistance. [b] 34. A device in art electric circuit that helps to mak^r break a circuit is a) Cell b) Fuse c) Switch d) Tester. [c] 35. An electric wire carries a current ofl A when a..

X-rays were discovered by Rontgen in 1895. Becquerel, in 1896, performed some experiments. He observed that salts of uranium affect a photographic plate covered with black paper after several hours of exposure. Becquerel further discovered that such radiations are the property of uranium salt. As..