MCQOPTIONS
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MCQOPTIONS
This section includes 170 Mcqs, each offering curated multiple-choice questions to sharpen your Avionics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The height to diameter ratio (H/D) for the column fermenters is |
| A. | >3 |
| B. | <3. |
| C. | >1.5 |
| D. | <1.5 |
| Answer» B. <3. | |
| 102. |
Chromatography is derived from word which means |
| A. | special writing |
| B. | colour writing |
| C. | ink writing |
| D. | black writing |
| Answer» C. ink writing | |
| 103. |
The pattern on the paper in chromatography is called |
| A. | chroming |
| B. | chroma |
| C. | chromatograph |
| D. | chromatogram |
| Answer» E. | |
| 104. |
Stationary phase is described as |
| A. | deceleration of growth and division rate after the growth rate reaches a maximum |
| B. | no further increase in the cell population after a maximum value |
| C. | deceleration of growth and division rate after the growth rate reaches a minimum |
| D. | acceleration of growth and division rate after the growth rate reaches a maximum |
| Answer» C. deceleration of growth and division rate after the growth rate reaches a minimum | |
| 105. |
A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be |
| A. | 2 litres per hour |
| B. | 2 litres |
| C. | 4 litres per hour |
| D. | 2 h-1 |
| Answer» E. | |
| 106. |
Solvent extraction works under the principle of |
| A. | Distribution law |
| B. | chromatography |
| C. | sublimation |
| D. | separation law |
| Answer» B. chromatography | |
| 107. |
A microorganism which is subjected to the Crabtree effect is most likely to |
| A. | respire in the presence of low sugar and high dissolved oxygen concentrations |
| B. | ferment in the presence of low concentrations of sugar and dissolved oxygen |
| C. | respire in the presence of high sugar and low dissolved oxygen concentrations |
| D. | ferment in the presence of high concentrations of sugar and dissolved oxygen |
| Answer» E. | |
| 108. |
Bacterial growth curve is obtained by plotting |
| A. | number fo spores versus time |
| B. | number of cells versus time |
| C. | log of number of cells survived versus time |
| D. | log of number of cells versus time |
| Answer» E. | |
| 109. |
In the stationary phase |
| A. | growth rate is equal to death rate |
| B. | growth is proportional to death |
| C. | no co-relation exist between death rate and growth rate |
| D. | growth rate is lesser than death rate |
| Answer» B. growth is proportional to death | |
| 110. |
Most of the compounds of copper in the __________ oxidation state are insoluble in water. |
| A. | 2 |
| B. | 1 |
| C. | 7 |
| D. | 3 |
| Answer» C. 7 | |
| 111. |
The sublimation is used to purify |
| A. | plasma |
| B. | gases |
| C. | solids |
| D. | liquids |
| Answer» D. liquids | |
| 112. |
The production of an amylase from starch by Aspergillus niger is often performed in a fed batch fermenter. This is due to the reason that |
| A. | fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium |
| B. | fed-batch reactor can be used to minimize starch concentrations and prevent niger from fermenting |
| C. | all of the above |
| D. | continuous reactor can be used to minimize starch concentrations and their inhibitory effects |
| Answer» B. fed-batch reactor can be used to minimize starch concentrations and prevent niger from fermenting | |
| 113. |
In a fluidized bed reactor mixing is achieved by |
| A. | upward movement of the incoming feed |
| B. | gravity flow of fluid |
| C. | both ( and ( |
| D. | diffusion |
| Answer» D. diffusion | |
| 114. |
The first step in the production of nickel from its ore, NiS, is to roast it in the presence of oxygen to form the metal oxide and . What is the coefficient of oxygen when the equation for this reaction is completed and balanced? |
| A. | 2 |
| B. | 1 |
| C. | 5 |
| D. | 3 |
| Answer» E. | |
| 115. |
A functional relationship between the specific growth rate and essential compounds concentration was proposed by Monod in |
| A. | 1946 |
| B. | 1958 |
| C. | 1950 |
| D. | 1942 |
| Answer» E. | |
| 116. |
The distribution co efficient is related to |
| A. | decreasing factor |
| B. | colouring factor |
| C. | retardation factor |
| D. | separating factor |
| Answer» D. separating factor | |
| 117. |
By using fluted filter paper rate of filtration is |
| A. | no effect |
| B. | remains same |
| C. | decreased |
| D. | increased |
| Answer» E. | |
| 118. |
The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to |
| A. | increase the overall yield of biomass |
| B. | increase the overall fermentation time |
| C. | decrease the overall yield of product |
| D. | decrease the overall fermentation time |
| Answer» E. | |
| 119. |
Suspended particles are collected on |
| A. | filter paper |
| B. | sieve |
| C. | surface |
| D. | funnel |
| Answer» B. sieve | |
| 120. |
A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a __________ culture. |
| A. | batch |
| B. | continuous |
| C. | semi continuous |
| D. | fed-batch |
| Answer» E. | |
| 121. |
The relative amounts of elements are discussed in |
| A. | Testing |
| B. | quantitative analysis |
| C. | Qualitative analysis |
| D. | Physical test |
| Answer» C. Qualitative analysis | |
| 122. |
The function of the disengagement zone in an airlift fermenter is to |
| A. | reduce the velocity of the bubbles |
| B. | prevent CO2 rich bubbles from entering the downcomer |
| C. | all of the above |
| D. | reduce liquid loss as aerosols |
| Answer» D. reduce liquid loss as aerosols | |
| 123. |
After collection crystals are washed with solvent which should be |
| A. | hot |
| B. | cold |
| C. | dilute |
| D. | polar |
| Answer» C. dilute | |
| 124. |
The example of drying agent is |
| A. | silicon dioxide |
| B. | acetic acid |
| C. | sulphuric acid |
| D. | phosphorus pentaoxide |
| Answer» E. | |
| 125. |
The sintered glass crucible needs no |
| A. | lid |
| B. | preparation |
| C. | cover |
| D. | apparatus |
| Answer» C. cover | |
| 126. |
The Greek word from which chromatography is derived is |
| A. | chroma |
| B. | chroming |
| C. | cromatus |
| D. | Khromatos |
| Answer» E. | |
| 127. |
An interstitial alloy contains nitrogen that occupies one-quarter of the octahedral holes of the closest-packed structure of the metal manganese. What is the formula of the alloy? |
| A. | MnN2 |
| B. | Mn2N |
| C. | MnN |
| D. | Mn4N |
| Answer» E. | |
| 128. |
Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because |
| A. | particles move with the fluid in a fluidized bed bioreactor |
| B. | mixing is higher in fluidized bed bioreactors |
| C. | all of the above |
| D. | immobilized particles are smaller in the fluidized bed bioreactors |
| Answer» B. mixing is higher in fluidized bed bioreactors | |
| 129. |
Where was Ezra Pound in 1946-1958? |
| A. | Alcatraz Prison |
| B. | Saint Elizabeth’s Hospital |
| C. | Saint Bartholomew’s Hospital |
| D. | Spandau Prison |
| Answer» C. Saint Bartholomew’s Hospital | |
| 130. |
Solvent should dissolve large amount of solute at |
| A. | cold temperaure |
| B. | room temperature |
| C. | elting point |
| D. | boiling point |
| Answer» E. | |
| 131. |
Which of the following is used to calculate mass of substrate in the reactor? |
| A. | Volume of reactor x substrate concentration in reactor |
| B. | Flow rate x substrate concentration in the reactor |
| C. | Volume of reactor x Flow rate |
| D. | Flow rate x mass of reactor |
| Answer» B. Flow rate x substrate concentration in the reactor | |
| 132. |
The pore size of filter paper depends upon size of |
| A. | funnel |
| B. | medium |
| C. | precipitate |
| D. | solvent |
| Answer» D. solvent | |
| 133. |
When did Ezra Pound publish A lume spento? |
| A. | 1908 |
| B. | 1912 |
| C. | 1901 |
| D. | 1906 |
| Answer» B. 1912 | |
| 134. |
Residence time distribution (RTD) of a reactor is independent of |
| A. | volume of reactor |
| B. | micro mixing |
| C. | width of the reactor |
| D. | height of the reactor |
| Answer» C. width of the reactor | |
| 135. |
The contents in stirred tank rector are mixed through |
| A. | a mechanical agitator |
| B. | compressed air |
| C. | any of these |
| D. | external pumping |
| Answer» B. compressed air | |
| 136. |
Which of the following is an example of a mathematical model? |
| A. | The Monod Model |
| B. | Volume of cuboid = length x breadth x height |
| C. | All of the above |
| D. | The Michaelis Menten Equation |
| Answer» D. The Michaelis Menten Equation | |
| 137. |
In a plug flow reactor, the highest concentration of substrates is exposed to the cells that |
| A. | are in the mid way along the reactor |
| B. | are near the effluent or exit of the reactor |
| C. | are near the wall of the reactor |
| D. | are located near entrance of feed |
| Answer» E. | |
| 138. |
Which of the following organisms will continue their metabolism at high substrate concentrations? |
| A. | Saccharomyces cerevisiae |
| B. | Pseudomonas aeruginosa |
| C. | Escherichia coli |
| D. | Bacillus subtilis |
| Answer» C. Escherichia coli | |
| 139. |
Who was FBI Director from 1924 to 1972? |
| A. | William Webster |
| B. | James Adams |
| C. | Louis Freeh |
| D. | John Edgar Hoover |
| Answer» E. | |
| 140. |
If tip of the funnel touches side of beaker it avoids |
| A. | splashing |
| B. | bubbling |
| C. | bumping |
| D. | backflow |
| Answer» B. bubbling | |
| 141. |
18 karat gold contains __________% gold. |
| A. | 25 |
| B. | 18 |
| C. | 75 |
| D. | 89 |
| Answer» D. 89 | |
| 142. |
Selectively dissolving a metal into solution is called ________. |
| A. | smelting |
| B. | roasting |
| C. | flux |
| D. | leaching |
| Answer» E. | |
| 143. |
Paper chromatography is done by |
| A. | 5 ways |
| B. | 2 ways |
| C. | 3 ways |
| D. | 4 ways |
| Answer» D. 4 ways | |
| 144. |
During the lag phase |
| A. | cells synthesize new proteins and membrane components |
| B. | cells just start growing |
| C. | cells simply grow slowly |
| D. | cells produce antibiotics to kill competing organisms |
| Answer» B. cells just start growing | |
| 145. |
Heat transfer rates (per unit volume) will be lowest in |
| A. | Continuous air lift bioreactor |
| B. | Stirred tank bioreactor with biomass recycle |
| C. | Continuous fluidized bed bioreactor |
| D. | Continuous packed bed reactor |
| Answer» E. | |
| 146. |
Mixing profiles closest to plug flow are observed in |
| A. | stirred tank reactor with biomass recycles |
| B. | continuous packed bed reactor |
| C. | all of these |
| D. | continuous fluidized bed bioreactor |
| Answer» C. all of these | |
| 147. |
The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of |
| A. | a small sparge ring |
| B. | higher oxygen transfer rates |
| C. | all of these |
| D. | better heat transfer efficiencies |
| Answer» E. | |
| 148. |
The maximum oxidation state in the first transition series is __________. |
| A. | 4 |
| B. | 2 |
| C. | 7 |
| D. | 5 |
| Answer» D. 5 | |
| 149. |
Tower fermentors are used for |
| A. | continuous beer production |
| B. | continuous penicillin production |
| C. | batch production of beer |
| D. | production of enzymes |
| Answer» B. continuous penicillin production | |
| 150. |
The lowest yield of ATP /is in |
| A. | aerobic respiration |
| B. | fermentation |
| C. | same in (, ( and ( |
| D. | anaerobic respiration |
| Answer» C. same in (, ( and ( | |