Description : A pond contains clean water. Which of the following activities will produce least pollution of water? a) Washing clothes in the pond c)domestic waste b) industrial waste d)Swimming in the pond
Last Answer : d)Swimming in the pond
Description : Which of the following is not a feature of potable water? a) It must be clean, colourless and odourless. b) It must be free from bacteria c) It must have excessive sodium ,calcium and magnesium d) It must contain dissolved oxygen and carbon dioxide
Last Answer : c) It must have excessive sodium ,calcium and magnesium
Description : The pollutants in water can be recognized by a) bad taste b)offensive odour c)growth of aquatic weed d)all the above
Last Answer : d)all the above
Description : Portable water should not have a) cannot have smell b)have impurities b) have harmful chemicals d)have microorganisms.
Last Answer : d)have microorganisms.
Description : Growth of __________ is promoted by the presence of manganese in water. (A) Files (B) Algae (C) Micro-organisms (D) Mosquitoes
Last Answer : (C) Micro-organisms
Description : The domestic sewage in large cities (a) has a high BOD as it contains both aerobic and anaerobic bacteria (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in ... sewage contains adequate oxygen (d) has very high amount of suspended solids and dissolved salts.
Last Answer : (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs)
Description : (2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a ... essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.
Last Answer : Metal are good conductors, because – (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface
Description : ch of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth? (A) Nitrogenous fertiliser (B) Potassic fertiliser (C) Phosphatic fertiliser (D) None of these
Last Answer : (A) Nitrogenous fertilise
Description : Phosphatic fertilisers (A) Are useful during early stage of the plant growth (B) Accelerate fruit formation in later stages of growth (C) Lessen the effect of excessive nitrogen application (D) None of these
Last Answer : (B) Accelerate fruit formation in later stages of growth
Description : Potassic fertilisers do not promote the development of (A) Stems & leaves during early stage of plant growth (B) Starches of potatoes & grains (C) Sugar of fruits & vegetables (D) Fibrous materials of plants
Last Answer : (A) Stems & leaves during early stage of plant growth
Description : Potassic fertilisers (A) Are useful during early stage of the plant growth (B) Stimulate early growth and accelerate seeding (C) Help in development of starches of potatoes and grain (D) None of these
Last Answer : (C) Help in development of starches of potatoes and grain
Description : 3 Diffusion of drugs across cell membrane: A. Is dependent upon metabolic activity of the cell B. Is competitively inhibited by chemically related drugs C. Is affected by extent of ionization of drug molecules D. Exhibits saturation kinetics
Last Answer : C. Is affected by extent of ionization of drug molecules
Description : Gram negative organisms are largely insensitive to benzyl penicillin because (a) They produce large quantities of penicillinase (b) They do not utilize D-alanine whose incorporation in the cell wall is ... lipoprotein-peptidoglycan multiplayer cell wall of gram-negative bacteria (d) Both (a) and (b)
Last Answer : Ans: C
Description : Gram negative organisms are largely insensitive to benzyl penicillin because: A. They produce large quantities of penicillinase B. They do not utilise D-alanine whose incorporation in the cell wall is inhibited ... multilayer cell wall of gram negative bacteria D. Both A' and B' are correct
Last Answer : . Benzyl penicillin is not able to penetrate deeper into the lipoprotein-peptidoglycan multilayer cell wall of gram negative bacteria
Description : Before discharging the foul sewage into rivers, it is generally treated by A. Screening B. Sedimentation C. Oxidation D. All the above
Last Answer : ANS: D
Description : Before discharging the foul sewage into rivers, it is generally treated by (a) screening (b) sedimentation (c) Oxidation (d) sludge digestion and disinfection (e) all the above*
Last Answer : e) all the above*
Description : How are algae used in sewage disposal? -Biology
Last Answer : answer:
Description : A lake with an inflow of domestic sewage rich in organic waste may result in
Last Answer : A lake with an inflow of domestic sewage rich in organic waste may result in A. ... increased production of fish due to biodegradable nutreints.
Description : In domestic sewage, suspended solids, colloidal and dissolved materials constitute
Last Answer : In domestic sewage, suspended solids, colloidal and dissolved materials constitute A. 0.1 B. 0.056 C. 0.027 D. 0.001
Description : When domestic sewage mixes with river water
Last Answer : When domestic sewage mixes with river water A. Small animals like rats will die after drinking ... for drinking as impurities are only about 0.1%
Last Answer : A lake with an inflow of domestic sewage rich in organic waste may result in A. Drying up ... to oxygen depletion D. Increased food web organisation.
Last Answer : A lake with an inflow of domestic sewage rich in organic waste may result in A. Drying of the river very ... . D. Death of fish due to lack of oxygen.
Last Answer : When domestic sewage mixes with river water A. The increased microbial activity releases micronutrients ... rats will die after drinking river water
Last Answer : A lake with an inflow of domestic sewage rich in organic waste may result in A. Drying ... D. Increased population of aquatic food web organisms
Description : What is domestic sewage and haze does it threaten water supplies?
Last Answer : What is the answer ?
Description : The liquid waste from kitchens and baths, of residences is known as: (1) Domestic sewage (2) Storm water (3) Sullage (4) Refuse
Last Answer : (3) Sullage Explanation: The liquid waste from kitchens and baths, of residence is known as sullage.
Description : Heavy metal pollution of water is caused by: (1) Paints (2) Wood burning (3) Acid Plants (4) Domestic sewage
Last Answer : (1) Paints Explanation: Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with ... these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
Description : Dry water flow in a combined sewer, is A. Industrial sewage B. Domestic sewage C. Storm water D. Inclusive of domestic and industrial sewage but excludes storm water
Last Answer : ANS: C
Description : The water carried sewerage system removes A. Domestic sewage B. Industrial sewage C. Storm sewage D. All the above
Description : When domestic sewage mixes with river water (a) small animals like rats will die after drinking river water (b) the increased microbial activity releases micronutrients such as iron (c) the increased ... (d) the river water is still suitable for drinking as impurities are only about 0.1%.
Last Answer : (c) the increased microbial activity uses up dissolved oxygen
Description : A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen ( ... of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.
Last Answer : (d) increased population of aquatic food web organisms.
Description : Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from (a) domestic sewage (b) dairy industry (c) petroleum industry (d) sugar industry.
Last Answer : c) petroleum industry
Description : A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen (c) drying of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.
Last Answer : (b) death of fish due to lack of oxygen
Last Answer : (c) petroleum industry
Description : Solid content in most of the domestic sewage is about __________ percent. (A) 0.001 (B) 0.1 (C) 5 (D) 10
Last Answer : (B) 0.1
Description : Fresh domestic sewage is __________ in color. (A) Grey (B) Dark brown (C) Red (D) Black
Last Answer : (A) Grey
Description : The liquid waste from kitchens and baths, of residences is known as : (1) Domestic sewage (2) Storm water (3) Sullage (4) Refuse
Last Answer : Sullage
Last Answer : Paints
Description : There were various factors that promoted the growth of Nationalism in India in the 19th century. -SST 10th
Last Answer : Nationalism means patriotism. A person who is patriotic loves his country and feels loyal towards it. The Nationalist Movement started as a revolt against Racial discrimination and repressive policies of Lord Lytton and Ilbert Bill controversy etc.
Description : Secretion of somatotrophin is promoted by (A) Somatomedin C (B) Somatostatin (C) Growth hormone releasing hormone (D) Hypoglycaemia
Last Answer : Answer : C
Description : Secretion of Insulin-like Growth Factor-I is promoted by (A) Insulin (B) Glucagon (C) Growth hormone (D) Somatomedin C
Description : Sludge banks are formed if sewage is disposed of in A. Rivers B. Seas C. Lakes D. None of these
Last Answer : ANS: B
Description : Which of the following is the largest source of water pollution in major rivers of India? (A) Untreated sewage (B) Agriculture run-off (C) Unregulated small scale industries (D) Religious practices
Last Answer : (A) Untreated sewage
Description : Secretion of growth hormone is inhibited by (A) Somatomedin C (B) Somatostatin (C) Feedback inhibition(D) All of these
Last Answer : Answer : B
Description : Sewage treatment process in which part of decomposer bacteria is recycled into starting of the process is called :
Last Answer : Sewage treatment process in which part of decomposer bacteria is recycled into starting of the ... C. Primary treatement D. Tertiary treatment.
Description : Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?
Last Answer : Which of the following is mainly produced by the activity of anaerobic bacteria on sewage? A. Marsh gas B. Laughing gas C. Propane D. Mustard gas
Description : The temperature affects the A. Biological activity of bacteria in sewage B. Solubility of gases in sewage C. Viscosity of sewage D. All the above
Description : Select the correct statement from the following. (a) Biogas is produced by the activity of aerobic bacteria on animal waste. (b) Methanobacterium is an aerobic bacterium found in rumen of ... sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.
Last Answer : (d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.
Description : Which of the following is mainly produced by the activity of anaerobic bacteria on sewage? (a) Laughing gas (b) Propane (c) Mustard gas (d) Marsh gas
Last Answer : (d) Marsh gas
Description : Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is (A) H2 (B) CH4 (C) CO2 (D) N2
Last Answer : (B) CH4