Description : Which of the following is bactericidal? A.Membrane filtration B.Ionizing radiation C.Freeze-drying D.Deep freezing
Last Answer : B.Ionizing radiation
Last Answer : onizing radiation
Description : Which one of the following best describes the growth conditions for a typical fungus? a. pH 3; 23°C; no oxygen gas present b. pH 8; 30°C; no oxygen gas present c. pH 6; 30°C; oxygen gas present d. pH 3; 23°C; oxygen gas present
Last Answer : c. pH 6; 30°C; oxygen gas present
Description : A microbe that is a microaerophilic mesophile would grow optimally at and a. high 02; 30°C b. low 02; 20°C c. no 02; 30°C d. low 02; 37°C
Last Answer : d. low 02; 37°C
Description : The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of A.300-400nm B.400-500nm C.500-600nm D.600-700nm
Last Answer : D.600-700nm
Description : Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface ... C will be at a temperature of __________ °C. (A) 40 (B) 95 (C) 70 (D) 50
Last Answer : (C) 70
Description : What happens when the temperature of water falls from 30°C and 0°C? (a) The volume of ice formed will be less than volume of water (b) The volume of ice formed will be more than the volume of water (c) Water will not freeze at 0°C (d) None of the above
Last Answer : Ans:(b)
Description : Which of the following is NOT a way to prevent food from being contaminated? a. Control The Initial Number Of Bacteria Present b. Prevent The Small Number From Growing c. Destroy Bacteria By Cooking Properly d. Avoid Recontamination After Cooking e. Re-Freeze Food After Cooking
Last Answer : e. Re-Freeze Food After Cooking
Description : The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the ... temperature of the right face in °C is (A) 77.2 (B) 71.2 (C) 63.8 (D) 48.7
Last Answer : (D) 48.7
Description : The size of a single plant cell is usually within the range of A.10-20μm in diameter and 25-100μm long B.20-40μm in diameter and 100-200μm long C.40-60μm in diameter and 200-300μm long D.60-80μm in diameter and 300-400μm long
Last Answer : B.20-40μm in diameter and 100-200μm long
Description : Optimum temperature for maximum crop development in wheat is (a) 10-15°C(b) 20-25°C (c) 25-30°C (d) 30-35°C
Last Answer : (b) 20-25°C
Description : Which is not a major defense mechanism in the stomach? A.Proteolytic enzymes B.Low pH C.Dense normal flora D.All of these
Last Answer : C.Dense normal flora
Description : Following are the defenses of the colon except A- sIgA B- fast flow rate C- dense resident microbiota D- mucus
Last Answer : fast flow rate
Description : Good quality of edible salt is obtained from brine by the process of (A) Solar evaporation (B) Vacuum evaporation (C) Freeze drying (D) Electrolysis
Last Answer : (B) Vacuum evaporation
Description : With the ever forward-marching advance of genetic engineering, how long do you estimate, until you can buy vials of engineered diseases that have targeted symptoms?
Last Answer : 50 years ago.
Description : What do you think of the tv preacher with a wig and facelift who sends out vials of holy water for free?
Last Answer : “Wow, he surely scary, especially he sends out holy water”
Description : On concrete roads, the camber generally provided, is (A) 1 in 20 to 1 in 24 (B) 1 in 30 to 1 in 48 (C) 1 in 36 to 1 in 48 (D) 1 in 60 to 1 in 72
Last Answer : Answer: Option D
Description : What precaution should be taken with a vessel's impressed current cathodic protection system after a drydocking period during which the hull has been painted? A. Output currents should be carefully monitored ... slight (10-15%) overcurrent to the anodes should be allowed in order to speed drying.
Last Answer : Answer: C
Description : Which of the following bacteria dies quickly after drying? A.Treponemapallidium B.Mycobacterium tuberculosis C.Staphylococcusaureus D.Pseudomonasaeruginosa
Last Answer : A.Treponemapallidium
Description : Which of the following bacteria dies quickly after drying? A- .Treponema palladium B- Mycobacterium tuberculosis C- Staphylococcus aureus D- Pseudomonas aeruginosa
Last Answer : .Treponema palladium
Description : Knife clips are placed with wearing plates spaced to apart a) 20 to 30 b) 45 to 60 c) 20 to 35 d) 30 to 40
Last Answer : 20 to 30
Description : Approximately 33% of all preserved food in the United States is______. a. canned b. frozen c. dehydrated d. pasteurized
Last Answer : b. frozen
Description : At 160°C, it takes about minutes to kilt bacterial spores in a hot-air oven. a. 30 b. 60 c. 90 d. 120
Last Answer : d. 120
Description : If water contracts on freezing, which of the following would happen? (a) Icebergs will completely float on the surface of water (b) Ice would become more dense (c) Lakes would freeze from top to bottom (d) Rocks will crack due to freezing of internal water
Description : What is the recommended time and pressure for sterilization of media using an Autoclave A 15 min 10 lbs B 60 min 5 lbs C 15 min 15 lbs D 15 min 20 lbs
Last Answer : C 15 min 15 lbs
Description : A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural ... , are a) 0.471 and 1.19 Hz b) 0.471 and 7.48 Hz c) 0.666 and 1.35 Hz
Last Answer : a) 0.471 and 1.19 Hz
Description : A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural ... .19 Hz b) 0.471 and 7.48 Hz c) 0.666 and 1.35 Hz d) 0.666 and 8.50 Hz
Description : From the following situation which is considered as deemed to suspension of government servant a. A Government Employee is under police custody on a Criminal charge exceeds 48 Hours b A Government ... Hours c A Government Employee is under police custody on a Criminal charge exceeds 12 Hours
Last Answer : a. A Government Employee is under police custody on a Criminal charge exceeds 48 Hours
Description : Pick out the wrong statement: (A) Reboiler is not used in open steam distillation (B) The separation of solutes of different molecular sizes in a liquid solution by use of a ... is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition
Last Answer : (D) Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition
Description : Mechanism of moisture removal in case of freeze drying of food stuff is by (A) Evaporation (B) Sublimation (C) Dehydration (D) Adsorption
Last Answer : (B) Sublimation
Description : In freeze- drying, water is removed from the product by a. Evaporation b. Sublimation c. Transpiration d. None of these
Last Answer : b. Sublimation
Description : Common salt is generally not produced commonly by __________ method from brine. (A) Freeze drying (B) Electrolytic (C) Solar evaporation (D) Vacuum evaporation
Last Answer : (A) Freeze drying
Description : Common salt is produced from sea water in India generally by the __________ method. (A) Freeze drying (B) Solar evaporation (C) Electrolytic (D) None of these
Last Answer : B) Solar evaporation
Description : The most common drying method is ____ drying. a. freeze- c. spray b. sun or tray drying d. oven
Last Answer : c. spray
Description : Explain The theory of freeze drying and state its application.
Last Answer : Theory:- i) In this process, the material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water vapours is ... antibiotics, blood products, vaccines, enzymes preparation, microbiological cultures & other thermo labile pharmaceutical substances.
Description : Explain principle of freeze drying. Give its advantages.
Last Answer : Principle: i. The material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water is reduced to less than that of material being dried. ii. ... it is properly sealed in an inert atmosphere. vii. The sterility of the product can be maintained.
Description : Give application of freeze drying.
Last Answer : (i) The process is mainly used for drying of biological products such as antibiotics, blood products, vaccines ,enzymes preparation, microbiological cultures etc. (ii) The heat sensitive material can be dried
Description : Discuss the theory, construction, and working of freeze drying apparatus
Last Answer : Theory: Freeze drying or sublimation drying consists of simply reducing the temperature & pressure to values below the triple point .(4.579mm of Hg& temp. of 0.0099 c) Under these ... . 5. Packing: Biological products are dried packed in aseptic condition immediately after drying.
Description : Discuss in brief Freeze drying.
Last Answer : Principle: The material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water is reduced to less than that of material being dried. Thus, it ... special precautions. 3. The period of drying is quite long.(usually not less than 10 hours)
Description : The symptoms of salmonellosis usually last about a. 24 hours. b. 48 hours. c. 5 days. d. 14 days.
Last Answer : b. 48 hours.
Last Answer : a. 24 hours.
Description : The duration of action of insulin-zinc suspension (lente insulin) is: A. 2–4 hours B. 8–10 hours C. 20–24 hours D. 30–36 hours
Last Answer : 20–24 hours
Description : Can I cook Salmon that has been frozen and then freeze again?
Last Answer : You can freeze it again, but I’m not sure the texture will be that good. What the heck, you don’t know until you try.
Description : Is the food itself damaged? What's happening?
Last Answer : Pathogens multiply. The meat may spoil or have a very poor texture / off-taste. It is not recommended to thaw and re-freeze!
Description : Fish can survive inside a frozen lake because (a) fish are warm blooded animals (b) fish hibernate in ice (c) water near the bottom does not freeze (d) ice is a good conductor of heat
Last Answer : Ans:(c)
Description : What is the setting for most autoclaves?a. 121oC at 15 psi for 15-30 minutes b. 100oC at 10 psi for 10-20 minutes c. 110oC at 21 psi for 20-30 min d. 150oC at 20 psi for 10-15 minutes
Last Answer : a. 121oC at 15 psi for 15-30 minutes
Description : In the three domain system of classification, the traditional bacteria are placed in the A- eukarya B- .archaea C- Eubacteria D- none of these
Last Answer : Eubacteria
Description : The L.C.M. of two numbers is 48. The numbers are in the ratio 2 : 3. Then sum of the number is: A.30 B.22 C.40 D.60 E.None of these
Last Answer : Answer – C (40) Explanation – Let the numbers be 2x and 3x. Then, their L.C.M. = 6x. So, 6x = 48 or x = 8. The numbers are 16 and 24. Hence, required sum = (16 + 24) = 40.