Description : Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes (A) Fire hazards (B) Explosion hazards (C) Persistent foam (D) Depletion of dissolved oxygen
Last Answer : (C) Persistent foam
Description : Presence of __________ in water stream are deleterious to aquatic life. (A) Soluble and toxic organics (B) Suspended solids (C) Heavy metals and cyanides (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause (A) Explosion (B) Non biodegradable foam (C) Undesirable plant growth (D) Corrosion
Last Answer : (A) Explosion
Description : Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes (A) Foaming (B) Odour nuisances (C) Undesirable plant growth (D) Turbidity
Last Answer : (C) Undesirable plant growth
Description : Example of anthropogenic hazards are: (a) Chemical explosion (b) Earthquake (c) Flood (d) Wild fire
Last Answer : (a) Chemical explosion
Description : Lagoons used for purification of polluted water (A) Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds (B) Use micro-organisms/bacteria in presence of dissolved oxygen (C) Gives an ... 1 mg/litre and BOD = 3.8 mg/litre (D) All (A), (B) & (C)
Description : Flash point of an oil gives an idea of the (A) Nature of boiling point diagram of the system (B) Amount of low boiling fraction present (C) Explosion hazards (D) All (A), (B) and (C)
Last Answer : (A) Nature of boiling point diagram of the system
Description : Flash point of a liquid petroleum fuel gives an idea about its (A) Volatility (B) Explosion hazards characteristics (C) Nature of boiling point diagram (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Biological Oxygen Demand (BOD) is a measure of: a. Industrial wastes poured into water bodies b. Extent to which water is polluted with organic compounds c. Amount of carbon monoxide inseparably combined with haemoglobin d. Amount of oxygen needed by green plants during night
Last Answer : Ans: A
Description : Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in (A) Coagulation and flocculation of colloids (B) Oxidation of carbonaceous matter to CO2 (C) ... to the nitrite and eventually to the nitrate (D) All (A), (B) and (C)
Description : Does anyone know why Albertsons has started carrying O Organics food (a Safeway brand)?
Last Answer : O Organics might not be wholly owned by safeway. They could just have had a joint licensing agreement. I say this because I always thought Method was a Target-owned brand, but they signed ... products, which are now popping up everywhere in awesome Karim Rashid-designed packaging. Just a thought.
Description : Presence of phosphorous in metallurgical coal (A) Is not undesirable (B) Reduces its calorific value (C) Badly affects the quality of steel
Last Answer : (C) Badly affects the quality of steel
Description : 54 Pick up the correct statement from the following: A. The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor B. The automatic purification of polluted ... phenomenon C. The photosynthesis is carried out in the presence of sun light D. All the above
Last Answer : ANS: D
Description : Radioactive substances present in the polluted water stream can be removed by (A) Biological oxygen treatment (B) Coagulation and filtration (C) Adsorption in ion exchange materials (D) None of these
Last Answer : (C) Adsorption in ion exchange materials
Description : Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by (A) Natural aeration of water stream (B) Photosynthetic action of algae (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)
Last Answer : (D) CFC (chloro fluoro carbon)
Description : Why it is important to remain alert to the presence of hazards in the whole workplace?
Last Answer : Feel Free to Answer
Description : I would like to know how to convince my roommate that some damaged electronics are fire hazards?
Last Answer : answer:Um, is this a copout? You can unplug the devices to clean the power bars if you want. This is not too much work. You might want to know which plugs seem to be in bad shape, ... if you buy surge protectors that are proper for your situation, you should be able to operate your devices safely.
Description : What can be done to avoid fire hazards caused by bad piping?
Last Answer : One way is to check for bad leakage. A water coming from the leakage can seep into the area of electrical wiring that could cause fire. Keep an eye for high water bill or any form of discoloration that might indicate leak to avoid hazards.
Description : What kind of floor lamps have been recalled for fire hazards?
Last Answer : Over the years there have been several different types of floor lamps that have been recalled for fire hazards. The most common and well known recalls were for Halogen Torchiere floor lamps as the bulb ... OTT-Lite True Color Floor Lamps were both recalled in 2001. All have been for fire hazards.
Description : Industrial hazards comes under the category of: (a) Natural hazards (b) Human induced hazards (c) Meteorological hazard (d) Wild fire hazard
Last Answer : (b) Human induced hazards
Description : Why normal rain is slightly acidic? A. due to presence of dust in air B. carbon dioxide and water in clouds react to form carbonic acid (Answer) C. Ozone depletion D. All of these
Last Answer : B. carbon dioxide and water in clouds react to form carbonic acid (Answer)
Description : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Description : High value of BOD (Biochemical Oxygen Demand) indicates that (a) water is less polluted (b) consumption of organic matter in the water is higher by the microbes (c) water is pure (d) water is highly polluted.
Last Answer : (b) consumption of organic matter in the water is
Last Answer : (b) consumption of organic matter in the water is higher by the microbes
Description : 10. High biological oxygen demand in a water body means ________ a. Water is not polluted b. Water is polluted c. Waterbody contains lots of lifeforms d. None of the above
Last Answer : Ans: Water is polluted
Description : In general, the limit of inflammability/explosion limit of fuel gases is widened by the (A) Increase in gas pressure (B) Increase in temperature (i.e. preheating) (C) Use of pure oxygen for combustion instead of air (D) All (A), (B) & (C)
Description : The material which on heating in presence of oxygen catches fire easily and produces heat and light energy is known as _________ material. a) combustible b)non-combustible c)conducting d)none
Last Answer : a) combustible
Description : A location with luxuriant growth of lichens on the trees indicates that the (a) trees are very healthy (b) trees are heavily infested (c) location is highly polluted (d) location is not polluted.
Last Answer : d) location is not polluted.
Description : Which gas in polluted air reduces the oxygen carrying capacity of blood in human body ?
Last Answer : Carbon monoxide gas from polluted air reduces the oxygen carrying capacity of blood in human body.
Description : . Presence of iron and manganese in water causes (A) Reduction in its dissolved oxygen content (B) Discoloration of bathroom fixtures (C) Temporary hardness (D) None of these
Last Answer : (B) Discoloration of bathroom fixtures
Description : Presence of carbonaceous matter in the sewage (A) Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures (B) Reduces sulphate ions to sulphides causing obnoxious ... quantity of chlorine used for its purification (D) All (A), (B) and (C)
Description : Irradiation causes undesirable flavor changes in ____ products. a. dairy c. meat b. grain d. vegetable
Last Answer : a. dairy
Description : Structural unemployment is mainly due to (a) Structural changes in the economy ; (b) Technological development (c) Growth in GDP ; (d) Population explosion.
Last Answer : (a) Structural changes in the economy ;
Description : Due to the growth of the internet and the predicted depletion of available addresses, a new version of IP version 6 using _____for the address was developed in 1995: a) 128 Bits b) 129 Bits c) 130 Bits d) None of These
Last Answer : a) 128 Bits
Description : In the lens: a. the potassium concentration is higher than that of the sodium b. the majority of the lens protein are water soluble c. glutathione is increased in the presence of cataract d. all above
Last Answer : all above
Description : In India, highest percentage of damages causes by flood hazards – a) Uttar Pradesh b) Bihar c) West Bengal d) Tripura
Last Answer : b) Bihar
Description : List causes and remedies for toxic hazards in chemical plant.
Last Answer : Toxic Hazards. A Substance is said to be toxic to the human body , if it has the ability to produce any ill effects on the human body when it reaches a susceptible site. The effect of toxic ... toxic hazards in the industry Educate workers about the first aid to be given in case of any emergency.
Description : Sudden mass death of fishes from oxygen depletion is more likely in case of:
Last Answer : Sudden mass death of fishes from oxygen depletion is more likely in case of: A. Eutrophic lake B ... lake C. Oligotrophic lake D. Oxaltrophic lake .
Description : Why death of fish is more common during summer than in winter? It is because of – (1) shortage of food (2) concentration of toxins (3) depletion of oxygen (4) spread of diseases
Last Answer : (3) depletion of oxygen Explanation: Fish die more in summer due to oxygen depletion which refers to low levels of dissolved oxygen (DO) in water. Warm water is much less ... because at high water temperatures their metabolic rates increase, hence their physiologic demand for oxygen increases.
Description : Ultraviolet radiation striking the earth is due to the depletion of – (1) carbon monoxide (2) carbon dioxide (3) ozone (4) oxygen
Last Answer : (3) ozone Explanation: Ozone is a powerful oxidant (far more so than dioxygen) and has many industrial and consumer applications related to oxidation. This same high oxidizing potential, however, ... 100 parts per billion. This makes ozone a potent respiratory hazard and pollutant near ground level.
Description : If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is A. 50 mg/l B. 100 mg/l C. 150 mg/l D. 250 mg/l
Description : If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is A. 50 ppm B. 100 ppm C. 150 ppm D. 200 ppm
Description : If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is A. 200 ppm B. 225 ppm C. 250 ppm D. None of these
Last Answer : ANS: C
Description : If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l
Description : Which of the following actions have to be avoided to prevent the depletion of DO (dissolved oxygen) in aquaculture? [a] Over-aerating, over-warming, over-harvesting [b] Over-seining, over-planting, over- ... c] Over-feeding, over-stocking, over-fertilizing [d] None of these [e] All of the above
Last Answer : [c] Over-feeding, over-stocking, over-fertilizing
Description : This cause the depletion of ozone layer by decomposing ozone to oxygen . a) CFC b)UV radiations c)CO2 d)O2
Last Answer : b)UV radiations
Description : Which one of the following is not a matter a global concern in the removal of tropical forests ? (A) Their ability to absorb the chemicals that contribute to depletion of ozone layer ... , moisture content and reflectivity. (D) Their contribution to the biological diversity of the planet.
Last Answer : (A) Their ability to absorb the chemicals that contribute to depletion of ozone layer.
Description : Why death of fish is more common during summer than in winter? It is because of (1) shortage of food (2) concentration of toxins (3) depletion of oxygen (4) spread of diseases
Last Answer : depletion of oxygen