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- Which of the following statements about AAS and AES is FALSE a)Sample used in AAS are usually in the form of aqueous solution b)In flame AAS, the flame is used for atomization as well as excitation purpose c)The graphite furnace is an example of non-flame atomizer d)In flame AES, no light source is required. What is the advantages of Axial torch configuration over Radial configuration in Inductive Couple Plasma-Optical Emission Spectrometer (ICP-OES) a)Increased radiation intensity – a longer path length b)Excellent tolerance to dissolve solids c)Can analyze S, P, and Halogens d)Excellent torch lifetimesWhich of the following stains highlights iron deposits in cells? Question 10 options: A) Prussian blue B) LAP C) TRAP D) alpha-naphthyl butyrate esterasewhat happens to hydrogen peroxide decomposed to oxyen when: a.) stirred slowly b.) Stirred
- Identify the single most correct choice: () a) lodine can inactivate microbial cellular proteins. ( b) Alcohols may dissolve lipids and hence possess antimicrobial activities. c) Moist heat may result in protein denaturation and hence possess antimicrobial activities. 7 d) a and c e) b and c f) a, b and cWhich of the following reagents can be used in the reaction in the photo? A.) pyridinium chlorochromate B.) potassium permanganate C.) sodium dichromate with sulfuric acid D.) potassium chromate with sulfuric acidWhich process conserves energy that would otherwise have been wasted and lost to the environment by recirculating warm air or water to heat a building or a water heater ? A) cogeneration B) combustion recovery C) electrostatic scrubber D) synergistic interaction
- 9) Which one of the below given properties can not be among the material selection criteria for biomaterials preparation ? a) Mechanical properteis b) Cheap and available c) Water Absorption rate d) Biostability durationDefine and differentiate the following terms: a.Halophilic , b.Capnophilic, and c.Microaerophilic20. Since heating is used to deodorize oils in the refining process, what can you conclude about the size and saturation of the odorant molecules relative to fatty acids? A) Odorant molecules should be larger and/or less saturated than typical fatty acids B) Odorant molecules should be smaller and/or less saturated than typical fatty acids C) Odorant molecules should be smaller and/or more saturated than typical fatty acids D) Odorant molecules should be larger and/or more saturated than typical fatty acids
- i) At what wavelengths do most of the bacteria collect? ii) State what is happening at those wavelengths suggested in (i) above to encourage accumulation of bacteria? Why did Englemann need to get rid of the oxygen before the start of the experiment? What conclusion can be drawn about the information shown in the diagram in Figure 3. iii) iv) (Do not repeat any statement made previously).Which statement among A-D is false regarding physical and chemical agents of control? A) O Effective killing of bacteria via irradiation with UV light would likely take longer than if irradiated with gamma rays or x-rays. B) O Detergent-type disinfectants exert their effect by solubilizing membranes. C) O Antiseptics are generally not as strongly concentrated as disinfectants D) O Sterilization and pasteurization are equivalent processes.A5 A6 is simply a flow of huge amount of air, usually from a higher pressure area to a low pressure area. a) Tidal b) Solar c) Wind . Which of the following belongs to the thermochemical process of bioenergy production? a) Anaerobic digestion b) Fermentation d) Geothermal c) Transesterification d) Combustion