31901. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas ?
31902. Pick out the wrong statement pertaining to 'green house' for the plants.
31903. In water treatment, alum[Al2(SO4)3] is used for the process of
31904. Pick out the one which is not a chemical coagulant.
31905. Presence of iron and manganese in water causes
31906. Septic tanks are used for the __________ of the deposited solids.
31907. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
31908. Which of the following acts as a natural source of air pollution ?
31909. Higher concentration of CO2 in atmosphere
31910. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
31911. Radioactive substances present in the polluted water stream can be removed by
31912. In the context of the chemical process industries, the term BOD is normally associated with the
31913. Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
31914. Inhalation of silica dust causes a disease called
31915. Solid content in most of the domestic sewage is about __________ percent.
31916. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
31917. High noise level in a chemical plant can be controlled by the
31918. Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
31919. Main pollutants released from petroleum refineries is
31920. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
31921. Which of the following is a green house gas other than CO2 ?
31922. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for
31923. Lagooning process is mainly a means of the
31924. Carbon monoxide is a pollutant, which causes
31925. Pollution by particulate matter emission in the atmosphere does not take place during metal
31926. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
31927. In how many weights can you measure 31 kgs of rice if you are just given one measuring weight of 1 kg?
31928. BOD of raw municipal sewage may be in the range of about __________ mg/litre.
31929. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
31930. When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.
31931. Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
31932. If Ramola ranks 14th in a class of 26,what is her rank from the last?
31933. Which of the following is not an air pollutant ?
31934. Presence of high concentration of ozone and smog in atmospheric air causes the
31935. Algae growth in water is controlled by
31936. __________ is removed from water by lime-soda process.
31937. Most of the bacteria in sewage are
31938. Which of the following is the most major constituents of air pollutants ?
31939. Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
31940. Carbonaceous particles having size less than 1 μm are called
31941. __________ substances present in sewage are removed in grit chamber during sewage treatment.
31942. The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
31943. Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
31944. TLV of aldrin in public water supply system is about __________ μg/litre.
31945. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
31946. Removal of __________ is accomplished by aeration of water.
31947. Green house effect is accentuated by
31948. Thermal pollution due to excessive heat & temperature in the working place causes
31949. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
31950. World environment day is observed every year on the 5th of
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