Lesson – Chemistry
Q901. Which is abundant in Gobar gas?
(a) Carbon dioxide
Q902. The working of a dry cell is based on
(a) Decomposition reaction
(b) Spontaneous oxidation-reduction reaction
(c) Combination reaction
Q903. Terylene is a condensation polymer of ethylene glycol and which acid?
(a) Benzoic Acid
(b) Salicylic acid
(c) Phthalic acid
(d) Terephthalic acid
Q904. A solution is
(a) a homogeneous mixture of two or more substances
(b) a solid dissolved in a liquid
(c) a solid dissolved i water
(d) a mixture of two liquids
Q905. A nibble is equal to_____ bits.
Q906. The enormous amount of energy released in an explosion of an atmoic bomb is due to the
(a) conversion of mass into energy
(b) conversion of chemical energy into heat energy
(c) conversion of mechnical energy into nuclear energy
(d) conversion of neutrons into protons
Q907. The particle required to continue the chain process of Uranium fission is :
Q908. The basic chemical building block of natural rubber obtained from trees is
Q909. Supersonic jet causes pollution by thinning of
(a) O3 layer
(b) O2 layer
(c) SO2 layer
(d) CO2 layer
Q910. Which gas is used as fire extinguisher ?
(a) Carbon dioxide
(b) Carbon monoxide
(c) Carbon suboxide
(d) Sulphur dioxide
Q911. The gas used in the artificial ripening of fruits is
Q912. The metallic constituents of hard water are :
(a) Magnesium, calcium and tin
(b) Iron, tin and calcium
(c) Calcium, magnesium and iron
(d) Magnesium, tin and iron
Q913. Which one of the following nonmetals shows allotropy in the liquid state?
Q914. Photo chemical smog is a resultant of the reaction among
(a) High concentration of NO2, O3, and CO in the evening
(b) CO, CO2 and NO2 at low temperature.
(c) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
(d) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
Q915. The percentage of litrogen in Air is
Q916. Which of the following has the highest penetrating power?
Q917. Which of the following metals is used in Space Crafts to withstand high temperatures ?
Q918. Brass is made of
(a) copper and tin
(b) tin and lead
(c) copper and zinc
(d) copper, tin and zinc
Q919. The material used in solar cells contains
Q920. The BOD values of water indicate the
(a) amount of organic debris
(b) amount of oxygen used for biochemical oxidation
(c) amount of oxygen used for biochemical reduction
(d) amount of ozone used for biochemical oxidation
Q921. Zinc sulphide is commonly used as
Q922. Which of the following is used to remove rust stains on cloth?
(c) Oxalic acid solution
Q923. Fertiliser having high nitrogen content is :
(b) Ammonium sulphate
(c) Ammonium nitrate
(d) Calcium citrate
Q924. Which one of the following forms of phosphorus is most reactive?
(a) Black phosphorus
(b) White phosphorus
(c) Violet phosphorus
(d) Red phosphorus
Q925. The “King of Metals” is :
Q926. Hydrochloric acid is also known as
(a) Galic acid
(b) Picric acid
(c) Muriatic acid
(d) Chloric acid
Q927. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
Q928. Which of the following imparts a blue colour to glass ?
(a) Cabalt oxide
(b) Copper oxide
(c) Iron oxide
(d) Nickel oxide
Q929. In a nuclear reactor the material use for absorbing neutrons is
Q930. Which one of the following is not a fertilizer?
(a) Ammonium sulphate
(b) Calcium sulphate
(c) Calcium ammonium nitrate
(d) Potassium nitrate
Q931. An atomic clock is based on transitions in
Q932. Sour milk contains
(a) acetic acid
(b) tartaric acid
(c) citric acid
(d) lactic acid
Q933. The major harmful gas emitted by automobile vehicle which causes air pollution is
(a) Carbon Monoxide
(c) Carbon dioxide
(d) Ozone gas
Q934. Glycol is used to manufacture which of the following ?
(b) Artificial silk
Q935. J.J. Thomson’s proposed model of action is generally called ………………. model.
(a) Cream and cake
(b) Plum and pudding
(d) Plum and cake
Q936. The first organic compound synthesised in the laboratory was
(b) Uric acid
(c) Lactic acid
Q937. The non-metal found in the liquid state is
Q938. The manufacture of iron from iron ore involves the process of
(c) fractional distillation
Q939. The total energy of revolving electron in an atom
(a) cannot be negative
(b) can have any value above zero
(c) can never be positive
(d) will always be positive
Q940. The chemical name of “laughing gas’ is
(a) Nitric oxide
(b) Nitrogen dioxide
(c) Nitrogen pentoxide
(d) Nitrous oxide