MCQOPTIONS
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MCQOPTIONS
This section includes 533 Mcqs, each offering curated multiple-choice questions to sharpen your Dairy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
'Plague' is caused mostly by |
| A. | Yersinia specie |
| B. | Serratia specie |
| C. | Brucella specie |
| D. | Shigella specie |
| Answer» B. Serratia specie | |
| 152. |
Lag phase is also known as |
| A. | period of initial adjustment |
| B. | transitional period |
| C. | generation time |
| D. | none of these |
| Answer» B. transitional period | |
| 153. |
The reproduction by budding occur in |
| A. | Rhodopseudomonas acidophila |
| B. | Hyphomicrobium vulgare |
| C. | Bacillus subtilis |
| D. | Both (a) and (b) |
| Answer» E. | |
| 154. |
Which of the following(s) is/are obligate anaeorbes? |
| A. | C septicum |
| B. | C novyi |
| C. | C tetani |
| D. | All of these |
| Answer» E. | |
| 155. |
Which of the following gram-negative bacteria is/are not aerobic? |
| A. | Pseudomonas |
| B. | Neisseria |
| C. | Escherichia |
| D. | None of these |
| Answer» D. None of these | |
| 156. |
McFadyean's reaction is employed for the presumptive diagnosis of |
| A. | anthrax |
| B. | tetanus |
| C. | typhoid |
| D. | all of these |
| Answer» B. tetanus | |
| 157. |
Botulinum toxin produces in wounds and food, causing a disease named as botulism, that is produced by |
| A. | Clostridium botulinum |
| B. | Bacillus anthracis |
| C. | Clostridium sordellii |
| D. | Clostridium tetani |
| Answer» B. Bacillus anthracis | |
| 158. |
In bacterial growth, growth rate slowed down due to toxic products or depletion of nutrients, resulting phase is known as |
| A. | Lag phase |
| B. | Log phase |
| C. | Stationary phase |
| D. | Death phase |
| Answer» D. Death phase | |
| 159. |
The average size of cells during the exponential phase of growth is |
| A. | greater than the lag phase |
| B. | lesser than the lag phase |
| C. | equal to the lag phase |
| D. | none of these |
| Answer» C. equal to the lag phase | |
| 160. |
Streptococcus are catalase-positive. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 161. |
Which of the following species of Mycobacterium is positive for nitrate reduction test? |
| A. | M chelonei |
| B. | M fortuitum |
| C. | Mycobacterium tuberculosis |
| D. | All of these |
| Answer» E. | |
| 162. |
The bacteria which are inhibited on crystal violet (1:500,000) blood agar, is/are |
| A. | Streptococci |
| B. | Staphylococci |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» C. Both (a) and (b) | |
| 163. |
The bacteria which is novobiocin resistant is |
| A. | Staphylococcus aureus |
| B. | S epidermidis |
| C. | S saprophyticus |
| D. | None of these |
| Answer» D. None of these | |
| 164. |
Bacteria that depends on oxygen for their 'ATP' generation is called |
| A. | Facultative aerobes |
| B. | Obligate aerobes |
| C. | Anaerobes |
| D. | Aerobes |
| Answer» C. Anaerobes | |
| 165. |
The test(s) used for the assay of cholera toxin is/are |
| A. | Radioimmunoassay |
| B. | Enzyme-linked immunosorbent assay |
| C. | Morphological changes in Chinese hamster ovary cells |
| D. | All of the above |
| Answer» E. | |
| 166. |
The mycoplasmas require which of the following substance for growth? |
| A. | Nitrogen |
| B. | Carbon |
| C. | Cholesterol |
| D. | Glucose |
| Answer» D. Glucose | |
| 167. |
'Borrelia' is causative agent for |
| A. | Pneumonia |
| B. | Whooping cough |
| C. | Lymph disease |
| D. | Alopecia |
| Answer» D. Alopecia | |
| 168. |
Which of the following is the suitable temperature range for mesophiles? |
| A. | 20-30°C |
| B. | 25-40°C |
| C. | >40°C |
| D. | None of these |
| Answer» C. >40°C | |
| 169. |
__________ protein keeps the prophage dormant and prevents virus reproduction. |
| A. | Operator |
| B. | Promotor |
| C. | Repressor |
| D. | Enhancer |
| Answer» D. Enhancer | |
| 170. |
Autotrophic bacteria are those which |
| A. | make their own food |
| B. | form a long chain glycocalyx |
| C. | are highly susceptible to penicillin |
| D. | produce a blue-green pigment |
| Answer» B. form a long chain glycocalyx | |
| 171. |
Which of the following species is associated with spoilage of canned goods? |
| A. | B.stearothermophiles |
| B. | B.cereus |
| C. | B.subtilis |
| D. | B.sphaericus |
| Answer» B. B.cereus | |
| 172. |
Which of the following bacteria is gram-negative cocci? |
| A. | Veillonella |
| B. | Peptococcus |
| C. | Peptostreptococcus |
| D. | Sporosarcina |
| Answer» B. Peptococcus | |
| 173. |
Postgates assay technique is useful in determining if a cell is viable even though it is |
| A. | incapable of cell division |
| B. | too small to see |
| C. | an obligate aerobe |
| D. | a thermophile |
| Answer» B. too small to see | |
| 174. |
The genus Desulfotomaculum obtain energy by anaerobic respiration. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» B. False | |
| 175. |
Which of the following cross-reacts with cell wall carbohydrate of Streptococcus pyogenes? |
| A. | Cardiac valves |
| B. | Synovial fluid |
| C. | Myocardium |
| D. | Vascular intima |
| Answer» B. Synovial fluid | |
| 176. |
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. | osmotolerant |
| B. | acidophile |
| C. | aerotolerant anaerobe |
| D. | alkalophile |
| Answer» B. acidophile | |
| 177. |
Klebsilla, E.coli, Enterobacters and pseudomonas are causative agent for |
| A. | Cancer |
| B. | Urinary tract infections |
| C. | Anthrax |
| D. | Peritonitis |
| Answer» C. Anthrax | |
| 178. |
Which of the following organisms typically get their carbon for biosynthesis from organic compounds? |
| A. | Aerobic, glucose-respiring bacteria (aerobic respiration) |
| B. | Ammonia-oxidizing bacteria (chemolithotrophic bacteria) |
| C. | Photosynthetic cyanobacteria (phototrophic metabolism) |
| D. | None of the above |
| Answer» B. Ammonia-oxidizing bacteria (chemolithotrophic bacteria) | |
| 179. |
Which of the following Clostridium species has the ability to fix Nitrogen? |
| A. | C.difficile |
| B. | C.pasteurianum |
| C. | C.tetani |
| D. | C.thermosaccharolyticum |
| Answer» C. C.tetani | |
| 180. |
The most pathogenic Brucella spp for man is |
| A. | B melitensis |
| B. | B abortus |
| C. | B suis |
| D. | B canis |
| Answer» B. B abortus | |
| 181. |
Reddening of meat in cooked meat broth is produced by |
| A. | C tetani |
| B. | C histolyticum |
| C. | Clostridium perfringens |
| D. | C sporogenes |
| Answer» D. C sporogenes | |
| 182. |
'Anthrax' is caused by gram positive rod, named as |
| A. | Bacillus |
| B. | Bacillus anthracis |
| C. | Bacillus sabtlis |
| D. | Bacillus cereus |
| Answer» C. Bacillus sabtlis | |
| 183. |
A positive Mantoux test indicates an area of induration of |
| A. | 4-9 mm in diameter |
| B. | 1-4 mm in diameter |
| C. | 10 mm or more in diameter |
| D. | None of these |
| Answer» D. None of these | |
| 184. |
Which of the following is/are not a gram-positive bacteria? |
| A. | Streptococci |
| B. | Pseudomonas |
| C. | Mycobacteria |
| D. | None of these |
| Answer» C. Mycobacteria | |
| 185. |
The procapsid is assembled with the aid of __________ proteins. |
| A. | ladder |
| B. | framing |
| C. | scaffolding |
| D. | form |
| Answer» D. form | |
| 186. |
The colonies of Mycoplasmas in agar plate can be observed by means of a __________________. |
| A. | low-power microscope |
| B. | high-power microscope |
| C. | phase contrast microscopy |
| D. | bright-field microscopy |
| Answer» B. high-power microscope | |
| 187. |
Mycoplasmas can be cultivated in vitro on nonliving media as _____________ |
| A. | facultative aerobes |
| B. | obligate aerobes |
| C. | facultative anaerobes |
| D. | microaerophiles |
| Answer» D. microaerophiles | |
| 188. |
Which is the most prevalent sexually transmitted disease in US? |
| A. | syphilis |
| B. | AIDS |
| C. | lymphogranuloma venerum |
| D. | nongonococcal urethritis |
| Answer» E. | |
| 189. |
The smallest cells of mycoplasmas are about ___________ in diameter. |
| A. | 1 micrometre |
| B. | 0.3 micrometre |
| C. | 5 micrometre |
| D. | 1 metre |
| Answer» C. 5 micrometre | |
| 190. |
Which of the following genus of organisms are normal inhabitants of human mouth? |
| A. | Agromyces |
| B. | Arachnia |
| C. | Actinomyces |
| D. | Rothia |
| Answer» E. | |
| 191. |
The most toxic exotoxin is |
| A. | tetanus toxin |
| B. | diphtheria toxin |
| C. | botulinum toxin |
| D. | cholera toxin |
| Answer» D. cholera toxin | |
| 192. |
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. | autotrophs |
| B. | phototrophs |
| C. | chemotrophs |
| D. | photo-organotrophs |
| Answer» B. phototrophs | |
| 193. |
'Pneumonia' is caused by |
| A. | Legionella pneumophila |
| B. | Mycoplasma?pneumoniae |
| C. | None of these |
| D. | Both a and b |
| Answer» E. | |
| 194. |
Which of the following bacteria is susceptible to thiophen-2-carboxylic acid hydrazide? |
| A. | M bovis |
| B. | Mycobacterium tuberculosis |
| C. | M chelonei |
| D. | M fortuitum |
| Answer» B. Mycobacterium tuberculosis | |
| 195. |
Which of the following genus of species occur on the surface of certain cheeses such as brick and Limburger? |
| A. | Brevibacterium |
| B. | Microbacterium |
| C. | Cellulomonas |
| D. | Arthrobacter |
| Answer» B. Microbacterium | |
| 196. |
Which of the following test(s) may establish retrospective diagnosis of streptococcal infection? |
| A. | Anti-DNase B test |
| B. | ASO test |
| C. | Streptozyme test |
| D. | All of these |
| Answer» E. | |
| 197. |
Most strains of Staphylococcus aureus indicate |
| A. | phosphatase production |
| B. | a golden-yellow pigment |
| C. | β-haemolysis on sheep blood agar |
| D. | all of the above |
| Answer» E. | |
| 198. |
Which of the following is the causative agent of dental caries? |
| A. | S.pneumoniae |
| B. | S.pyogenes |
| C. | S.mutans |
| D. | S.faecalis |
| Answer» D. S.faecalis | |
| 199. |
'Syphilis' is caused by |
| A. | Borrelia |
| B. | Treponema |
| C. | Leptosira |
| D. | Mycolasma |
| Answer» C. Leptosira | |
| 200. |
Bacteria capable to produce their own food are known as |
| A. | saprophytes |
| B. | parasites |
| C. | autotrophs |
| D. | penicillin |
| Answer» D. penicillin | |