MCQOPTIONS
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MCQOPTIONS
This section includes 108 Mcqs, each offering curated multiple-choice questions to sharpen your Operating System knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Why high concentration of sugars are not employed in the fermentation medium? |
| A. | Calcium lactate is not produced |
| B. | Calcium lactate crystallizes from the medium and slows down the process of fermentation |
| C. | High sugar concentration itself crystallizes |
| D. | None of the above |
| Answer» C. High sugar concentration itself crystallizes | |
| 52. |
Which of the following substance is employed to neutralize the lactic acid as it is produced (because lactic acid bacteria do not tolerate high concentrations of acid? |
| A. | CaCO3 |
| B. | (NH4)2 HPO4 |
| C. | MgSO4 |
| D. | Na2SO4 |
| Answer» B. (NH4)2 HPO4 | |
| 53. |
The micro-organism used for industrial production of lactic acid using corn dextrose as media is |
| A. | Lactobacillus bulgaricus |
| B. | Lactobacillus delbrueckii |
| C. | Lactobacillus pentosus |
| D. | Streptococcus lactis |
| Answer» C. Lactobacillus pentosus | |
| 54. |
Which of the following are true for the heterofermentative microorganism producing lactic acid? |
| A. | Only trace amounts of end products other than lactic acid |
| B. | Some lactic acid with carbon dioxide, ethyl alcohol, acetic acid and trace amount of few other products |
| C. | They are used for commercial lactic acid production |
| D. | None of the above |
| Answer» C. They are used for commercial lactic acid production | |
| 55. |
Which of the following microorganism produces only L(+) - lactic acid without further racemization ? |
| A. | Leuconostoc mesenteroides |
| B. | Lactobacillus delbrueckii |
| C. | Rhizopus oryzae |
| D. | Lactobacillus bulgaricus |
| Answer» D. Lactobacillus bulgaricus | |
| 56. |
The man who first discovered the chemical that causes souring of milk was |
| A. | Pasteur |
| B. | Scheele |
| C. | Watson |
| D. | Ronald Ross |
| Answer» C. Watson | |
| 57. |
The method of distillation used to obtain alcohol greater than 95 percent is called |
| A. | fractional distillation |
| B. | flash evaporation |
| C. | azeotropic distillation |
| D. | successive distillation |
| Answer» D. successive distillation | |
| 58. |
The maximum concentration of ethanol that is achieved by successive distillation of fermentation broth in continuous stills is |
| A. | 60% |
| B. | 95% |
| C. | 70% |
| D. | 99% |
| Answer» C. 70% | |
| 59. |
Which of the following is not a principal media for industrial alcohol production by fermentation? |
| A. | Black strap molasses |
| B. | Sulphite waste liquor |
| C. | Wood waste |
| D. | Glucose |
| Answer» E. | |
| 60. |
The production of alcohol from lactose of whey is generally carried out by |
| A. | Saccharomyces cerevisiae |
| B. | Candida pseudotropicalis |
| C. | Candida utilis |
| D. | none of these |
| Answer» C. Candida utilis | |
| 61. |
The sulphite waste liquor fermentation employs use of Candida utilis because of its ability to ferment |
| A. | sucrose |
| B. | pentose |
| C. | glucose |
| D. | maltose |
| Answer» C. glucose | |
| 62. |
Which of the following agents involve biosensors linking with electronic circuit? |
| A. | Microorganisms |
| B. | Microbially derived enzymes |
| C. | Either microorganisms or microbially derived enzymes |
| D. | Neither microorganisms nor microbially derived enzymes |
| Answer» C. Either microorganisms or microbially derived enzymes | |
| 63. |
Species of the genus Streptomyces are known for |
| A. | the production of antibiotics |
| B. | the production of beer |
| C. | the production of cheese |
| D. | nitrification |
| Answer» B. the production of beer | |
| 64. |
Commercial scale production of amino acids is typically carried out using |
| A. | regulatory mutants to cause overproduction of biochemical intermediates |
| B. | creation of an intentional increase in membrane permeability to increase release of the amino acids |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 65. |
A major organic acid produced by a microbial process used in foods is |
| A. | sulfuric acid |
| B. | citric acid |
| C. | oxalic acid |
| D. | uric acid |
| Answer» C. oxalic acid | |
| 66. |
The immediate precursor for glumatic acid production by Corynebacterium glutamicum is |
| A. | lysine |
| B. | oxoacetate |
| C. | citrate |
| D. | 2-oxo-glutarate |
| Answer» E. | |
| 67. |
Most biopolymers produced by micro-organisms are |
| A. | cell wall constituents |
| B. | nucleic acids |
| C. | histones |
| D. | exopolysaccharides |
| Answer» E. | |
| 68. |
Microbially produced streptokinase is used to |
| A. | remove spots from laundry products |
| B. | dissolve clots for patients with coronary blockages |
| C. | clarify fruit juice |
| D. | breakdown starch molecules into smaller sugars |
| Answer» C. clarify fruit juice | |
| 69. |
The organism B. brevis can be used commercially for the production of |
| A. | gramicidin A |
| B. | tyrothricin(bacitracin tyrocidin complex) |
| C. | tyrocidin |
| D. | all of the above |
| Answer» E. | |
| 70. |
Malt used to ferment beer is prepared by |
| A. | roasting barley |
| B. | washing the barley with water and drying it in air |
| C. | soaking barley in water followed by germination and drying |
| D. | treating barley with bovine amylase followed by roasting |
| Answer» D. treating barley with bovine amylase followed by roasting | |
| 71. |
Anaerobic bacteria undergoes butyric isopropyl fermentation in carbohydrates to yield |
| A. | glycol |
| B. | butyric acid |
| C. | acetic acid |
| D. | all of these |
| Answer» E. | |
| 72. |
The address of the next instruction to be executed by the current process is provided by the __________ |
| A. | CPU registers |
| B. | Program counter |
| C. | Process stack |
| D. | Pipe |
| Answer» C. Process stack | |
| 73. |
A process stack does not contain __________ |
| A. | Function parameters |
| B. | Local variables |
| C. | Return addresses |
| D. | PID of child process |
| Answer» E. | |
| 74. |
A set of processes is deadlock if __________ |
| A. | each process is blocked and will remain so forever |
| B. | each process is terminated |
| C. | all processes are trying to kill each other |
| D. | none of the mentioned |
| Answer» B. each process is terminated | |
| 75. |
A process can be terminated due to __________ |
| A. | normal exit |
| B. | fatal error |
| C. | killed by another process |
| D. | all of the mentioned |
| Answer» E. | |
| 76. |
In operating system, each process has its own __________ |
| A. | address space and global variables |
| B. | open files |
| C. | pending alarms, signals and signal handlers |
| D. | all of the mentioned |
| Answer» E. | |
| 77. |
The systems which allow only one process execution at a time, are called __________ |
| A. | uniprogramming systems |
| B. | uniprocessing systems |
| C. | unitasking systems |
| D. | none of the mentioned |
| Answer» C. unitasking systems | |
| 78. |
A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10,000 in one hour, the calling rate is |
| A. | 0.9 |
| B. | 10/9 |
| C. | 0.81 |
| D. | 0.1 |
| Answer» C. 0.81 | |
| 79. |
If random process X(t) and Y(t) are orthogonal then |
| A. | SXY(f) = 0 |
| B. | SXY(f) = SX(f) = SY(f) |
| C. | RXY(τ) = h(τ) |
| D. | H(f) = 0 |
| Answer» B. SXY(f) = SX(f) = SY(f) | |
| 80. |
_____ is the first school where children start their initial learning. |
| A. | Family |
| B. | Primary school |
| C. | Play school |
| D. | Society |
| Answer» B. Primary school | |
| 81. |
A random process X(t) is defined as:X(t) = 2 cos (2πt + Y)Where Y is a discrete random variable with \(P\left( {Y = 0} \right) = \frac{1}{2}\) and \(P\left( {Y = \frac{\pi }{2}} \right) = \frac{1}{2}\).The mean μx(1) is |
| A. | \(\frac{1}{4}\) |
| B. | \(\frac{1}{3}\) |
| C. | \(\frac{1}{2}\) |
| D. | 1 |
| Answer» E. | |
| 82. |
A device has 200 Ω equivalent noise resistance, 300 Ω input resistor, and the bandwidth of the amplifier is 6 MHz. If the operating temperature of the amplifier is 290° K, the noise voltage at the input of a television RF amplifier will be nearly |
| A. | 7 μV |
| B. | 5 μV |
| C. | 3 μV |
| D. | 1 μV |
| Answer» B. 5 μV | |
| 83. |
Cross-correlation function provides: |
| A. | Information about the structure of only one signal |
| B. | Information about the behavior of only one signal in the time domain |
| C. | The measure of dissimilarities between two signals |
| D. | The measure of similarities between two signals |
| Answer» E. | |
| 84. |
Organization set-up of the school influences the learning of students. This factor belongs to which category? |
| A. | Physiological factors |
| B. | Psychological factors |
| C. | Social factors |
| D. | Other factors |
| Answer» D. Other factors | |
| 85. |
In the process of education and socialization, which of the following are transmitted to the students?I. Social hierarchyII. Inherent inequalityIII. Social stratification |
| A. | I and III |
| B. | II and III |
| C. | I and II |
| D. | I, II and III |
| Answer» E. | |
| 86. |
A random process X(t) is called ‘white noise’ if the power spectral density is equal to |
| A. | \(\frac{\eta }{8}\) |
| B. | \(\frac{\eta }{2}\) |
| C. | \(\frac{3\eta }{4}\) |
| D. | η |
| Answer» C. \(\frac{3\eta }{4}\) | |
| 87. |
_____ is a fundamental unit of any community and society that acts as an institution connecting the individual and society. |
| A. | Religion |
| B. | Politics |
| C. | Economy |
| D. | Family |
| Answer» E. | |
| 88. |
Consider a random process ( |
| A. | cos (2π (t1 + t2)) |
| B. | sin (2π (t1 – t2)) |
| C. | sin (2π (t1 + t2)) |
| D. | cos (2π (t1 – t2)) |
| Answer» E. | |
| 89. |
Following are few statements regarding noise in communication system:a) Atmospheric noise, shot noise, solar noise are examples of external noise sourcesb) Noise temperature is useful in dealing with UHF noisec) Thermal agitation is the only source of noise in receiverChoose the correct answer: |
| A. | Only b) |
| B. | and b) |
| C. | and c) |
| D. | and c) |
| Answer» B. and b) | |
| 90. |
______ are defined as a system that controls through its organisations and legal or legitimate use of force |
| A. | Religious institution |
| B. | Economic institution |
| C. | Social institution |
| D. | Political institution |
| Answer» E. | |
| 91. |
If the covariance of two random variable X and Y is μXY, their correlation coefficient ρXY is: |
| A. | In μXY |
| B. | \(ln\;\left( {\frac{{{\mu _{XY}}}}{{{\sigma _X}{\sigma _Y}}}} \right)\) |
| C. | \(\frac{{{\sigma _X}{\sigma _Y}}}{{{\mu _{XY}}}}\) |
| D. | \(\frac{{{\mu _{XY}}}}{{{\sigma _X}{\sigma _Y}}}\) |
| Answer» E. | |
| 92. |
If the autocorrelation function of the sinusoidal signal x(t) = A cos (ω0 t + ϕ) is R(τ), then R(0) is given by (in terms of power spectral density of R(τ) = S(f)) |
| A. | \(R\left( 0 \right) = \mathop \smallint \limits_{ - \infty }^\infty S\left( f \right)df\) |
| B. | \(R\left( 0 \right) = \mathop \smallint \limits_{ - \infty }^\infty \exp \left\{ {S\left( f \right)} \right\}df\) |
| C. | R(0) = S(f)|f = ∞ |
| D. | \(R\left( 0 \right) = \mathop \smallint \limits_{ - \infty }^\infty lnS\left( f \right)df\) |
| Answer» B. \(R\left( 0 \right) = \mathop \smallint \limits_{ - \infty }^\infty \exp \left\{ {S\left( f \right)} \right\}df\) | |
| 93. |
One of the basic principles of socializing individuals is |
| A. | Religion |
| B. | Caste |
| C. | Education |
| D. | Imitation |
| Answer» D. Imitation | |
| 94. |
An LTI system has a wide-sense stationary (WSS) input signal with zero mean. Its output is: |
| A. | non-zero mean and non-WSS signal |
| B. | zero mean and WSS signal |
| C. | non-zero mean and WSS signal |
| D. | zero mean and non-WSS signal |
| Answer» C. non-zero mean and WSS signal | |
| 95. |
Children's attitudes towards persons of different ethnic groups are generally based upon |
| A. | Their sibling's attitude |
| B. | The attitudes of their peer |
| C. | Their parent's attitudes |
| D. | The influence of television |
| Answer» D. The influence of television | |
| 96. |
If a random process X(t) is ergodic then, statistical averages |
| A. | and time averages are different |
| B. | and time averages are same |
| C. | are greater than time averages |
| D. | are smaller than time averages |
| Answer» C. are greater than time averages | |
| 97. |
Let X(t) be a wide sense stationary random process with the power spectral density SX(f) as shown in Figure (a), where f is in Hertz (Hz). The random process X(t) is input to an ideal lowpass filter with the frequency response:\(H\left( f \right) = \left\{ {\begin{array}{*{20}{c}} {1,}&{\left| f \right| \le \frac{1}{2}Hz}\\ {0,}&{\left| f \right| > \frac{1}{2}Hz} \end{array}} \right.\)This is as shown in Figure (b). The output of the lowpass filter is Y(t).Let E be the expectation operator. Consider the following statements:I. E(X(t)) = E(Y(t))II. E(X2(t)) = E(Y2(t))III. E(Y2(t)) = 2Select the correct option: |
| A. | only I is true |
| B. | only II and III are true |
| C. | only I and II are true |
| D. | only I and III are true |
| Answer» B. only II and III are true | |
| 98. |
A wide sense stationary random process X(t) passes through the LTI system shown in the figure. If the autocorrelation function of X(t) is RX(τ), then the autocorrelation function RY(τ) of the output Y(t) is equal to |
| A. | 2RX (τ) + RX (τ - T0) - RX (τ + T0) |
| B. | 2RX (τ) - RX (τ - T0) - RX (τ + T0) |
| C. | 2RX (τ) + 2RX (τ - 2T0) |
| D. | 2RX (τ) - 2RX (τ - 2T0) |
| Answer» C. 2RX (τ) + 2RX (τ - 2T0) | |
| 99. |
______ is a process through which community transact or educate their members about the norms and values of the society. |
| A. | Social empowerment |
| B. | Social stratification |
| C. | Politicization |
| D. | Socialization |
| Answer» E. | |
| 100. |
If the autocorrelation function of a random process X(t) is R(τ) its power spectral density is: |
| A. | S(f) = In R(τ) |
| B. | S(f) = exp (R(τ)) |
| C. | S(f) = R(τ)*R(τ) |
| D. | \(S\left( f \right) = \mathop \smallint \nolimits_{ - \infty }^\infty R\left( \tau \right)\exp \left\{ { - \left( {j 2\pi f \tau } \right)} \right\}d\tau \) |
| Answer» E. | |