Description : Secondary sewage treatment is mainly a
Last Answer : Secondary sewage treatment is mainly a A. Primary treatements B. Secondary treatement C. Tertiary treatment D. All of the above
Last Answer : Secondary sewage treatment is mainly a A. Biological process B. Physical process C. Mechanical process D. Chemical process
Description : During sewage treatment, effluent from which one of the following treatment units has minimum wt/vol amount of suspended solids? (a) Detritus channel (b) Primary sedimentation tank (c) Secondary sedimentation tank (d) Activated sludge process aeration tank
Last Answer : (d) Activated sludge process aeration tank
Description : The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria. (A) Anaerobic (B) Saprophytic (C) Aerobic (D) Parasitic
Last Answer : (C) Aerobic
Description : Use of chlorine in the treatment of sewage (A) Helps in grease separation (B) Increases the biological oxygen demand (BOD) (C) Causes bulking of activated sludge (D) Aids in flocculation
Last Answer : (A) Helps in grease separation
Description : Lagooning process is mainly a means of the (A) Sludge disposal (B) Reduction of excessive flow in sewers (C) Biological treatment of wastes (D) None of these
Last Answer : (A) Sludge disposal
Description : Which is correct matched ? 1. Arsenic poisoning -Black foot disease. 2. Secondary Effluent treatment-Biological process. 3. Pyrolysis -Solid soil wast
Last Answer : Which is correct matched ? 1. Arsenic poisoning -Black foot disease. 2. Secondary Effluent treatment-Biological process. 3. ... C. 2,3,4,5 D. 1,2,3,4
Description : The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known A. Bio-Chemical Oxygen Demand (B.O.D.) B. Dissolved Oxygen (D.O.) C. Chemical Oxygen Demand (C.O.D.) D. None of these
Last Answer : ANS: B
Description : Difference between primary and secondary sewage treatment? -Biology
Last Answer : answer:
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 : Which of the following in sewage treatment removes suspended solids? (a) Secondary treatment (b) Primary treatment (c) Sludge treatment (d) Tertiary treatment
Last Answer : (b) Primary treatment
Description : Which of the following in sewage treatment removes suspended solids ? (1) Secondary treatment (2) Primary treatment (3) Sludge treatment (4) Tertiary treatment
Last Answer : (2) Primary treatment
Description : The two most practical means of the home owner to control insects and diseases are: a. Mechanical and chemical b. Mechanical and biological c. Chemical and biological d. Biological and natural
Last Answer : Mechanical and biological
Description : Explain any two types of weathering: - 1. Mechanical Weathering 2. Chemical Weathering 3. Biological Weathering. 4. Spheroidal Weathering.
Last Answer : 1. Mechanical Weathering: - a) In mechanical weathering the rock surface is broken into smaller pieces without any chemical change. b) In mechanical weathering the smaller broken smaller rock ... rock. c) The main factor that affects chemical weathering are hydration, carbonizations, oxidation.
Description : Dried sewage after treatment is used as A. Fertilizer B. Building material C. Chemical for lowering B.O.D. D. Base material for paints
Last Answer : ANS: A
Description : The main process to purify water by filtration, is (A) Mechanical straining (B) Flocculation and sedimentation (C) Biological metabolism (D) All the above
Last Answer : (D) All the above
Description : Drained sewage has biological oxygen demand `(BOD)`:
Last Answer : Drained sewage has biological oxygen demand `(BOD)`: A. More than that of water B. Less than that of ... equal to that of water D. None of the above
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
Last Answer : ANS: D
Description : Aerobic biological oxidation ponds used for the purification of polluted water (A) Destroys/removes pathogen from the sewage (B) Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents (C) ... much more effectively if the sewage is chlorinated (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the (A) Bacterial stability factor (B) Relative stability (C) Biological oxygen demand (BOD) (D) Oxygen ion concentration
Last Answer : (B) Relative stability
Description : what All substances have characteristic properties. If one of these properties can be observed without changing the identity of the substance, it must be A. universal property. B. physical property. C. biological property. D. chemical property.?
Last Answer : B: Physical Property
Description : __works to anticipate, identify and evaluate workplace health risk factors associated with chemical, physical, environmental and biological hazards?
Last Answer : Industrial hygienist (IH)
Description : Oparin's theary about origin of life' is related to - (1) chemical evolution (2) physical evolution (3) biological evolution (4) artificial evolution
Last Answer : (1) chemical evolution Explanation: Alexander Oparin was a Russian biochemist, notable for his contributions to the theory of the origin of life on Earth, and particularly for the primordial soup theory of the evolution of life from carbon-based molecules.
Description : Any change in physical (smell, colour taste), chemical and biological characteristics of water is called
Last Answer : water pollution
Description : An undesirable change in the physical, chemical and biological characteristics of the environment is called
Last Answer : pollution.
Description : Sun drying is — method of pest control. a. Physical b. Chemical c. Biological d. Cultural
Last Answer : a. Physical
Description : Cultivation of resistant variety is —- method of pest control. a. Physical b. Chemical c. Biological d. Cultural
Last Answer : d. Cultural
Description : Which of the following is NOT one of the 3 main types of water pollution? a. Physical pollution b. Chemical pollution c. Thermal pollution d. Biological pollution
Last Answer : c. Thermal pollution
Description : Spatial variation in horizontal and vertical directions is caused due to: (A) Physical weathering of rocks (B) Chemical weathering of rocks (C) Biological weathering of rocks (D) All of these
Last Answer : Answer: Option D
Description : Selectivity achieved due to changes in functional group is called a). Physical b). Biological c). Chemical d). Chronological
Last Answer : d). Chronological
Description : The environment friendly weed control method a). Biological b). Physical c). Chemical d). None
Last Answer : a). Biological
Description : What are the methods of treatment & disposal of radioactive wastes? (A) Evaporation & chemical precipitation (B) Biological methods & adsorption in ion exchange materials (C) Fixing into a solid mass with cement and sinking deep in the sea (D) All (A), (B) & (C)
Description : When sufficient energy through mechanical mixing is supplied to keep the entire contents, including the sewage solids, mixed and aerated, the reactor is termed : (a) An aerobic lagoon (b) An aerobic pond (c) A facultative lagoon (d) A facultative pond
Last Answer : (a) An aerobic lagoon
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 : The biochemical treatment applied to sewage effluents is a process of (A) Dehydration (B) Reduction (C) Oxidation (D) Polymerisation
Last Answer : (C) Oxidation
Description : Indicate which of the statement is incorrect (a) The detritus tank is type of a grit chamber (b) In detritus tank, velocity of flow is further reduced (c) Grit chambers are provided in the sewage ... to remove the heavier inorganic matter as grit, sand etc. from the sewage (d) None of them*
Last Answer : (d) None of them*
Description : The resources which can be renewed or reproduced by physical, chemical or mechanical processes. -SST 10th
Last Answer : (i) Stock (ii) Renewable
Description : Mechanical digestion is the fragmentation of food aided by specialized physical structures, such as teeth, previous to extracellullar digestion. The mechanical fragmentation of food helps digestive ... there are mandibles and chewing muscles to triturate food previous to the chemical digestion.
Last Answer : Concerning extracellular digestion what is meant by chemical digestion?
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 : A well oxidized sewage contains nitrogen mainly as A. Nitrates B. Nitrites C. Free ammonia D. None of these
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 : Which of the following is not a secondary evidence? a) Copy prepared from original by mechanical process which has been compared with original. b) Copy prepared from original by mechanical ... contents of document who has seen document d) Copy prepared from original and compared with it.
Last Answer : c) Oral evidence of a person about contents of document who has seen document
Description : Hazards and Disasters are mainly classified as a. Physical and chemical b. Natural and Human induced c. Physical and Human d. Social and cultural
Last Answer : b. Natural and Human induced
Description : Are micropipette biological or mechanical?
Last Answer : Mechanical
Description : Mary’s biological concept of species is mainly based on: (a) Morphological traits (b) Reproductive isolation (c) Modes of reproduction (d) Morphology and reproduction
Last Answer : Ans. ((b))
Description : Electrophoresis is mainly used for: (a) Differentiate the biological sample (b) To perform the human specific presumptive tests (c) DNA isolation from biological material (d) Separates the molecules
Last Answer : Ans: (d). Separate the molecules
Description : Pick out the wrong statement. (A) Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties (B) Low carbon steel does not respond to ... are also used for surface hardening (D) Martempering of a material is a hardening process
Last Answer : Option C
Description : Main function of biofertilizer is— (A) To increase chemical process (B) To increase physiological process (C) To increase biological process (D) To increase photosynthesis process
Last Answer : (C) To increase biological process
Description : Main function of biofertilizer is a) To increase chemical process b) To increase physiological process c) To increase biological process d) To increase photosynthesis process
Last Answer : c) To increase biological process
Description : The following is the physical characteristic of sewage A. Turbidity B. Colour C. Odour D. All the above