MCQOPTIONS
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MCQOPTIONS
This section includes 113 Mcqs, each offering curated multiple-choice questions to sharpen your Avionics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Lag phase is also known as |
| A. | transitional period |
| B. | period of initial adjustment |
| C. | none of these |
| D. | generation time |
| Answer» C. none of these | |
| 52. |
The pH of a buffer solution relies upon concentration of its |
| A. | conjugate base |
| B. | acid |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 53. |
Strontium compounds put on a nichrome wire and heated gives of color |
| A. | scarlet red |
| B. | brick red |
| C. | blue |
| D. | apple green |
| Answer» B. brick red | |
| 54. |
Which of these metal oxides, upon roasting with clay turns into cement? |
| A. | CaO |
| B. | NO |
| C. | MgO |
| D. | BaO |
| Answer» B. NO | |
| 55. |
An organism that expends energy to grow in a habitat with a low water activity in order to maintain internal solute concentrations to retain water is |
| A. | acidophile |
| B. | osmotolerant |
| C. | alkalophile |
| D. | aerotolerant anaerobe |
| Answer» C. alkalophile | |
| 56. |
The presence of benzene ring in an alkylarene can affect the characteristic reactions of its |
| A. | beta chain |
| B. | alkyl-side chain |
| C. | all of them |
| D. | alpha chain |
| Answer» C. all of them | |
| 57. |
The organism which obtain their energy from chemicals are designated as |
| A. | chemotrophs |
| B. | prototrophs. |
| C. | autotrophs |
| D. | organotrophs |
| Answer» B. prototrophs. | |
| 58. |
What was the patent number for tuned or syntonic telegraphy? |
| A. | 1948 |
| B. | 1111 |
| C. | 9999 |
| D. | 7777 |
| Answer» E. | |
| 59. |
Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as |
| A. | chemo-lithotrophs |
| B. | fastidious hetrotrophs |
| C. | photo-organotrophs |
| D. | chemotrophs |
| Answer» C. photo-organotrophs | |
| 60. |
The average size of cells during the exponential phase of growth is |
| A. | lesser than the lag phase |
| B. | greater than the lag phase |
| C. | none of these |
| D. | equal to the lag phase |
| Answer» B. greater than the lag phase | |
| 61. |
A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the |
| A. | organism should be grown in an anaerobic chamber |
| B. | organism are aerobes |
| C. | organism cannot tolerate oxygen |
| D. | organism cannot produce superoxide dismutase and/or catalase |
| Answer» C. organism cannot tolerate oxygen | |
| 62. |
On 2 June 1886 Grover Cleveland married Frances Folsom. He was 49. How old was she? |
| A. | 21 |
| B. | 18 |
| C. | 30 |
| D. | 24 |
| Answer» B. 18 | |
| 63. |
The Nucleophilic substitution reaction is slowest with |
| A. | fluroalkanes |
| B. | iodoalkanes |
| C. | none |
| D. | both a and b |
| Answer» B. iodoalkanes | |
| 64. |
Where did Guglielmo Marconi set up his laboratory? |
| A. | Florence |
| B. | Naples |
| C. | Pontecchio |
| D. | Skopje |
| Answer» D. Skopje | |
| 65. |
Some organisms can use reduced inorganic compounds as electron donors and are termed as |
| A. | phototrophs |
| B. | lithotrophs |
| C. | photo-organotrophs |
| D. | chemotrophs |
| Answer» C. photo-organotrophs | |
| 66. |
The group II elements are metals which form |
| A. | covalent compounds |
| B. | ionic compounds |
| C. | none |
| D. | both a and b |
| Answer» C. none | |
| 67. |
To which political party did Grover Cleveland belong? |
| A. | Green |
| B. | Democratic |
| C. | National |
| D. | Republican |
| Answer» C. National | |
| 68. |
An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is |
| A. | acidophile |
| B. | osmotolerant |
| C. | aerotolerant anaerobe |
| D. | neutrophile |
| Answer» B. osmotolerant | |
| 69. |
Marine animals die due to lack of oxygen in water which disturbs whole |
| A. | ecosystem |
| B. | environment |
| C. | a-biotic factors |
| D. | biotic factors |
| Answer» B. environment | |
| 70. |
All organisms require at least small amounts of carbondioxide, However, some can use CO2 as their sole source of carbon. Such organisms are termed as |
| A. | phototrophs |
| B. | autotrophs |
| C. | photo-organotrophs |
| D. | chemotrophs |
| Answer» C. photo-organotrophs | |
| 71. |
Exponential phase of growth curve of bacteria is of limited duration because of |
| A. | accumulation of toxic metabolites |
| B. | rise in cell density |
| C. | all of these |
| D. | exhaustion of nutrients |
| Answer» D. exhaustion of nutrients | |
| 72. |
Generation time of Escherichia coli is |
| A. | 20 hours |
| B. | 20 minutes |
| C. | 200 hours |
| D. | 20 days |
| Answer» D. 20 days | |
| 73. |
The type of molecular structure of beginning Period 3 elements is |
| A. | giant molecules |
| B. | giant metallic structure |
| C. | individual atoms |
| D. | simple molecules |
| Answer» C. individual atoms | |
| 74. |
Down the Halogen Group, the reactivity |
| A. | decreases |
| B. | increases |
| C. | constant |
| D. | becomes zero |
| Answer» B. increases | |
| 75. |
What did Guglielmo Marconi invent? |
| A. | Telegraph |
| B. | Radio |
| C. | Television |
| D. | Photocopier |
| Answer» C. Television | |
| 76. |
Which of the following is not the characteristic of a growth curve? |
| A. | Plotted with logarithmic numbers |
| B. | Shows development of microbial population under relatively stable environmental conditions |
| C. | Each growth curve consists of four distinct phases |
| D. | Graphs numbers of microbes versus time |
| Answer» D. Graphs numbers of microbes versus time | |
| 77. |
Bromine is released during reactions as |
| A. | blue gas |
| B. | reddish brown gas |
| C. | reddish green gas |
| D. | white gas |
| Answer» C. reddish green gas | |
| 78. |
Postgates assay technique is useful in determining if a cell is viable even though it is |
| A. | too small to see |
| B. | incapable of cell division |
| C. | a thermophile |
| D. | an obligate aerobe |
| Answer» C. a thermophile | |
| 79. |
The atomic number of Barium (Ba) is |
| A. | 38 |
| B. | 12 |
| C. | 56 |
| D. | 20 |
| Answer» D. 20 | |
| 80. |
Bacteria and fungi multiply best |
| A. | between 16-38°C |
| B. | below 16°C |
| C. | none of these |
| D. | above 38°C |
| Answer» B. below 16°C | |
| 81. |
The fragmentation occurs in |
| A. | Nocardia species |
| B. | Streptomyces species |
| C. | None of these |
| D. | Bacillus subtilis |
| Answer» C. None of these | |
| 82. |
The microorganisms that grow best in a low-oxygen environment is called a (n) |
| A. | anaerobe |
| B. | aerobe |
| C. | microaerophile |
| D. | facultative |
| Answer» D. facultative | |
| 83. |
Catalytic converters can not help in any way to reduce |
| A. | nitrogen oxides |
| B. | carbon monoxide |
| C. | unburnt hydrocarbons |
| D. | carbondioxide |
| Answer» E. | |
| 84. |
In the exponential phase, the cells and cell mass |
| A. | decreases |
| B. | first increases then decreases |
| C. | double at a constant rate |
| D. | are constant |
| Answer» D. are constant | |
| 85. |
The reproduction by budding occur in |
| A. | Hyphomicrobium vulgare |
| B. | Rhodopseudomonas acidophila |
| C. | Both (a) and (b) |
| D. | Bacillus subtilis |
| Answer» B. Rhodopseudomonas acidophila | |
| 86. |
Halogenoalkanes reacts with water in silver nitrate solution to give off |
| A. | yeast |
| B. | alcohol |
| C. | ketone |
| D. | ester |
| Answer» C. ketone | |
| 87. |
Five d orbitals having same energy level in an isolated transition metal atom is described as |
| A. | spectator |
| B. | degenerate |
| C. | all of them |
| D. | non-degenerate |
| Answer» C. all of them | |
| 88. |
Which company was set up by Guglielmo Marconi in 1897? |
| A. | The Wireless Telegraph & Signal Company Limited |
| B. | American Telephone & Telegraph |
| C. | Italian Telegraph |
| D. | British Telecom |
| Answer» B. American Telephone & Telegraph | |
| 89. |
Which of these elements uses all outer shell electrons in bonding with oxygen? |
| A. | Na |
| B. | S |
| C. | None of Above |
| D. | both of these |
| Answer» E. | |
| 90. |
The cell reproduction in bacteria may occur by |
| A. | budding |
| B. | binary fission |
| C. | all of these |
| D. | fragmentation |
| Answer» D. fragmentation | |
| 91. |
Which of the following has more tolerance for acidic pH (lower pH)? |
| A. | Bacteria |
| B. | Yeast and moulds |
| C. | None of these |
| D. | E. coli |
| Answer» C. None of these | |
| 92. |
An electron entering the outermost shell of Fluorine will |
| A. | experience most shielding from the positive nuclear charge |
| B. | experience least shielding from the positive nuclear charge |
| C. | experience most shielding from the negative nuclear charge |
| D. | experience least shielding from the negative nuclear charge |
| Answer» C. experience most shielding from the negative nuclear charge | |
| 93. |
The growth is normally expressed as __________ in turbidimetric measurement |
| A. | cfu/ml |
| B. | cells per ml |
| C. | mg N2 /ml |
| D. | optical density |
| Answer» E. | |
| 94. |
Where was Guglielmo Marconi born? |
| A. | Turin |
| B. | Bologna |
| C. | Venice |
| D. | Milan |
| Answer» C. Venice | |
| 95. |
Consider the reaction: Al(s) + Cl2 → Al2Cl6(s). How many moles of Al(s) will be needed to balance the equation? |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 3 |
| Answer» B. 1 | |
| 96. |
What is the primary source of food for marine life? |
| A. | Zooplankton |
| B. | Phytoplankton |
| C. | Grass |
| D. | Sea weed |
| Answer» C. Grass | |
| 97. |
Greater number of electrons in halogens are indicative of |
| A. | least volatility |
| B. | greater van der Wall's forces |
| C. | None of Above |
| D. | both of these |
| Answer» E. | |
| 98. |
Bacteria of genus Nitrosomonas use __________ as their electron source. |
| A. | H2S |
| B. | ammonia |
| C. | light |
| D. | succinate |
| Answer» C. light | |
| 99. |
Acidic oxides of sulfur and nitrogen can fall pH of rainwater to |
| A. | 6 |
| B. | 4 |
| C. | 5 |
| D. | 1 |
| Answer» C. 5 | |
| 100. |
The straightforward method of binary fission explains how bacteria |
| A. | evolve |
| B. | grow in nutrient agar |
| C. | reproduce |
| D. | move |
| Answer» D. move | |