176: There are more anti-bacterial drugs than anti-viral drugs because
(a) Bacterial diseases are intra-cellular.
(b) Viral diseases are intra-cellular.
(c) Virus are smaller than bacteria.
(d) Drugs can penetrate bacteria more effectively
177: Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to
(a) The formation of hydrochloric acid when chlorine is added to, water
(b) The formation of hypochlorous acid when chlorine is added to water
(c) The formation of nascent oxygen when chlorine is added to water
(d) The formation of hydrogen when chlorine is added to water
178: Which one of the following statements regarding starch and cellulose is not correct ?
(a) Both of them are of plant origin
(b) Both of them are polymers
(c) Both of them give colour with iodine
(d) Both of them are made up of glucose molecules
179: Which one of the following fuels causes minimum environmental pollution ?
(a) Diesel
(b) Coal
(c) Hydrogen
(d) Kerosene
Explanation:
Coal Diesel and Kerosene on combustion releases CO'2, SO'2 and other Nitroge oxides in the atmosphere unlike 'Hydrogen' which is having highest fuel value (150 KJ/g) and is least harmful to the environment among fuels.
180: Natural rubber is a plant product which is chemically known as
(a) Mucilage
(b) Gum
(c) Latex
(d) Resin