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.
| 51. |
Stirred tank fermenter (STF) can be employed for |
| A. | anaerobic fermentation of a wide range of cells including microbial, animal and plant cells |
| B. | aerobic fermentation of a wide range of cells including microbial, animal and plant cells |
| C. | anaerobic fermentation of plant cells only |
| D. | Both ( and ( |
| Answer» E. | |
| 52. |
For organisms growing in a chemostat, the specific growth rate |
| A. | can be determined from the dilution rate |
| B. | cannot be determined |
| C. | none of the above |
| D. | equals to the maximum specific growth rate of the culture |
| Answer» B. cannot be determined | |
| 53. |
The solid which undergoes sublimation is |
| A. | argon |
| B. | iodine |
| C. | sodim chloride |
| D. | water |
| Answer» C. sodim chloride | |
| 54. |
Ether layer is used to separate |
| A. | fibres |
| B. | inorganic impurities |
| C. | organic impurities |
| D. | none |
| Answer» D. none | |
| 55. |
In paper chromatography the stationary phase is |
| A. | water |
| B. | solid or liquid |
| C. | gas |
| D. | solution |
| Answer» B. solid or liquid | |
| 56. |
The Whatmann filter paper used for paper chromatography is about |
| A. | 30 cm |
| B. | 20 cm |
| C. | 50 cm |
| D. | 35cm |
| Answer» C. 50 cm | |
| 57. |
The specific growth rate (μ) is defined as |
| A. | rate of increase of total biomass in a reactor |
| B. | the concentration of biomass in the reactor |
| C. | the rate of cell death |
| D. | the rate of individual cells division or increase in their biomass |
| Answer» E. | |
| 58. |
The stationary phase forms a thin |
| A. | film |
| B. | coating |
| C. | slide |
| D. | none |
| Answer» B. coating | |
| 59. |
Where did Ezra Pound move in 1924? |
| A. | London |
| B. | Berlin |
| C. | Chicago |
| D. | Rapallo |
| Answer» E. | |
| 60. |
Which of the statement is true for continuous reactor at steady state? |
| A. | Biomass, substrate and product concentrations are zero |
| B. | The rates of biomass, substrate and product concentrations are zero |
| C. | Biomass, substrate and product concentrations change with time |
| D. | Biomass, substrate and product concentrations do not change with time |
| Answer» E. | |
| 61. |
An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called |
| A. | chemostat |
| B. | manostat |
| C. | culturostat |
| D. | turbidostat |
| Answer» B. manostat | |
| 62. |
Cooling during crystallization must be done at |
| A. | fast rate |
| B. | slow rate |
| C. | moderate rate |
| D. | very high rate |
| Answer» D. very high rate | |
| 63. |
A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system. |
| A. | batch |
| B. | continuous |
| C. | semi continuous |
| D. | fed-batch |
| Answer» D. fed-batch | |
| 64. |
The solvent used for crystallization must be |
| A. | expensive |
| B. | inexpensie |
| C. | moderate |
| D. | low quality |
| Answer» C. moderate | |
| 65. |
The funnel shoud be at top ofcircumference of the paper by |
| A. | 3-4cm |
| B. | 1-2cm |
| C. | 4-5cm |
| D. | 5-6cm |
| Answer» C. 4-5cm | |
| 66. |
A mixed fermentation is one, which produces |
| A. | both acid and carbon dioxide |
| B. | both alcohol and carbon dioxide |
| C. | several different kinds of acid |
| D. | both acid and alcohol |
| Answer» E. | |
| 67. |
In an airlift bioreactor, the air sparging region is called |
| A. | disengagement zone |
| B. | downcomer |
| C. | none of these |
| D. | air riser |
| Answer» E. | |
| 68. |
The fastest route of NADH reoxidation is |
| A. | anaerobic respiration |
| B. | aerobic respiration |
| C. | decomposition |
| D. | fermentation |
| Answer» E. | |
| 69. |
An agent used for decoulourization is |
| A. | sulphuric acid |
| B. | animal charcoal |
| C. | acetic acid |
| D. | alcohol |
| Answer» C. acetic acid | |
| 70. |
Which of the following would not be subjected to the \"glucose effect\"? |
| A. | Saccharomyces cerevisiae |
| B. | Aspergillus fumigatus |
| C. | Aspergillus niger |
| D. | Escherichia coli |
| Answer» E. | |
| 71. |
The lowest biomass yield in a culture of Escherichia coli will be in |
| A. | an aerated batch reactor containing an initial low concentration of glucose |
| B. | an aerated batch culture containing a initial high concentration of glucose |
| C. | an aerated continuous reactor having a low glucose concentration |
| D. | an aerated fed-batch reactor having a low glucose concentration |
| Answer» C. an aerated continuous reactor having a low glucose concentration | |
| 72. |
The science of chemical chracterization is |
| A. | Analytical chemistry |
| B. | Physical chemistry |
| C. | Organic chemistry |
| D. | Inorganic chemistry |
| Answer» B. Physical chemistry | |
| 73. |
The angle of the apex of filter paper should be slightly greater than |
| A. | 35 degree |
| B. | 40 degree |
| C. | 60 degree |
| D. | 50 degree |
| Answer» D. 50 degree | |
| 74. |
In the accelerated phase, cell starts to |
| A. | decrease and the division rate increases to reach a maximum |
| B. | increase and the division rate increases to reach a maximum |
| C. | increase and the division rate increases to reach a minimum |
| D. | increase and the division rate decreases to reach a maximum |
| Answer» C. increase and the division rate increases to reach a minimum | |
| 75. |
Turbidostat is recommended when continuous fermentation needs to be carried out at |
| A. | low dilution rates near the washout point |
| B. | high dilution rates near the washout point |
| C. | any intensity of dilution rates near the washout point |
| D. | moderate dilution rates near the washout point |
| Answer» C. any intensity of dilution rates near the washout point | |
| 76. |
Another method used occasionally for drying crystals is |
| A. | vacuum dessicator |
| B. | hot plate |
| C. | water bath |
| D. | none |
| Answer» B. hot plate | |
| 77. |
Crystals are collected by Gooch crucible with help of |
| A. | force |
| B. | water bath |
| C. | vacuum pump |
| D. | centrifuge |
| Answer» D. centrifuge | |
| 78. |
An alloy in which small, usually nonmetallic atoms fit between the metallic atoms of a crystal is a(n) _________ alloy. |
| A. | compositional |
| B. | interstitial |
| C. | metallic |
| D. | substitutional |
| Answer» E. | |
| 79. |
The solvents used in crystallization should be |
| A. | miscible |
| B. | immiscible |
| C. | polar |
| D. | non polar |
| Answer» B. immiscible | |
| 80. |
One of the most common solvent used for crystallization is |
| A. | water |
| B. | syrup |
| C. | normal saline |
| D. | sulphuric acid |
| Answer» B. syrup | |
| 81. |
Inorganic impurities during solvent extraction remains in the |
| A. | ether layer |
| B. | aqueous layer |
| C. | middle |
| D. | at bottom |
| Answer» C. middle | |
| 82. |
Pseudo-steady state in a continuous reactor refers to a reactor in which |
| A. | concentration oscillate around a mean value |
| B. | Pseudomonads are being cultured |
| C. | concentration decrease with time |
| D. | concentration increase with time |
| Answer» B. Pseudomonads are being cultured | |
| 83. |
Which book of Ezra Pound was published in 1910? |
| A. | ABC of Economics |
| B. | Hugh Selwyn Mauberley |
| C. | What Is Money For? |
| D. | The Spirit of Romance |
| Answer» E. | |
| 84. |
Which of the following is a false statement about copper? |
| A. | Copper was one of the first metals to be isolated and used by humans. |
| B. | Unlike many metals, copper can be found in its Copper was one of the first metals to be isolated and used by humans. elemental form. . |
| C. | Copper is not recyclable, but is found in abundant deposits |
| D. | Copper and tin form a common alloy known as bronze. |
| Answer» D. Copper and tin form a common alloy known as bronze. | |
| 85. |
Blood has an approximate pH of |
| A. | 7 to 8 |
| B. | 3 to 4 |
| C. | 13 to 14 |
| D. | 10 to 11 |
| Answer» B. 3 to 4 | |
| 86. |
The function of a mechanical seal is to |
| A. | prevent cells from leaving the reactor |
| B. | prevent contaminants entering the reactor |
| C. | prevent air to enter |
| D. | both ( and ( |
| Answer» E. | |
| 87. |
The insoluble impurities from solution during crystallization are removed by |
| A. | drying |
| B. | filtration |
| C. | heating |
| D. | cooling |
| Answer» C. heating | |
| 88. |
What is the term of FBI Director since 1976? |
| A. | Six years |
| B. | Four years |
| C. | Twelve years |
| D. | Ten years |
| Answer» E. | |
| 89. |
The optical density sometimes drops during the lag phase because |
| A. | of fast cell growth causing them to fill up with DNA |
| B. | cells tend to grow without dividing leading to a decrease in the surface area to volume ratio |
| C. | cells swell up with RNA |
| D. | cells swell up with water |
| Answer» C. cells swell up with RNA | |
| 90. |
Bigger crystals are yield by |
| A. | heating |
| B. | no cooling |
| C. | fast cooling |
| D. | slow cooling |
| Answer» E. | |
| 91. |
The process in which solid is directly converted to vapors state is called |
| A. | sublimation |
| B. | filtration |
| C. | drying |
| D. | cooling |
| Answer» B. filtration | |
| 92. |
Paper is dipped in solvent mixture at about |
| A. | 6-7cm |
| B. | 5-6cm |
| C. | 3-4cm |
| D. | 4-8cm |
| Answer» C. 3-4cm | |
| 93. |
The components which have small value of K have affinity for |
| A. | mobile phase |
| B. | stationary phase |
| C. | no phase |
| D. | solution |
| Answer» C. no phase | |
| 94. |
Diauxie is |
| A. | microbiological die off |
| B. | growth factors |
| C. | the stagewise uptake of nutrients |
| D. | the simultaneous uptake of nutrients |
| Answer» D. the simultaneous uptake of nutrients | |
| 95. |
An alloy in which one metal atom substitutes for another in the crystal structure is a(n) _________ alloy. |
| A. | substitutional |
| B. | interstitial |
| C. | metallic |
| D. | compositional |
| Answer» B. interstitial | |
| 96. |
Most common example of extraction is with help of |
| A. | Ether |
| B. | alcohol |
| C. | benzene |
| D. | chloroform |
| Answer» B. alcohol | |
| 97. |
The type of crucibles used for filtration is usually |
| A. | two |
| B. | seven |
| C. | six |
| D. | five |
| Answer» C. six | |
| 98. |
Which Act passed in 1910 significantly increased the Bureau of Investigation’s jurisdiction over interstate crime? |
| A. | Espionage Act |
| B. | White Slave Traffic Act |
| C. | Prevention of Corruption Act |
| D. | Freedom of Information Privacy Act |
| Answer» C. Prevention of Corruption Act | |
| 99. |
What is the FBI motto? |
| A. | Purity, Charity, Duty |
| B. | Fidelity, Bravery, Integrity |
| C. | Charity, Unity, Fraternity |
| D. | Poverty, Chastity, Obedience |
| Answer» C. Charity, Unity, Fraternity | |
| 100. |
During the exponential phase the maximum specific growth rate equals specific growth rate as |
| A. | concentration of growth limiting substrate is much greater than the monod constant |
| B. | concentration of the growth limiting substrate is much less than the monod constant |
| C. | concentration of the growth limiting substrate is equal to the monod constant |
| D. | specific growth rate increases exponentially |
| Answer» B. concentration of the growth limiting substrate is much less than the monod constant | |