MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Biotechnology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Bacterial leaching is possible with low concentrations and requires little energy inputs. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Which type of ore is the major source of nickel? |
| A. | Oxide |
| B. | Sulfide |
| C. | Carbonate |
| D. | Ferrous |
| Answer» C. Carbonate | |
| 3. |
In the studies of Joffe and Sperll, it was observed that ________ is efficient for solubilizing Ni but the presence of ______ had adverse effect on leaching. |
| A. | T. <i>ferrooxidans</i>; cobalt |
| B. | T.<i>trioxidanes</i>; molybdenum |
| C. | T. <i>ferrooxidans</i>; molybdenum |
| D. | T. trioxidanes; cobalt |
| Answer» D. T. trioxidanes; cobalt | |
| 4. |
Which leaching agent is used for the slow decomposition of refractory gold ores? |
| A. | Nickel |
| B. | Sulphur |
| C. | Cyanide |
| D. | Molybdenum |
| Answer» D. Molybdenum | |
| 5. |
Acidithiobacillus sp. is used to extract what kind of metal ore? |
| A. | Oxide |
| B. | Carbonate |
| C. | Silicate |
| D. | Sulphate |
| Answer» E. | |
| 6. |
Which of the following mechanism is used for bioleaching of uranium? |
| A. | Direct Leaching Mechanism |
| B. | Indirect Leaching Mechanism |
| C. | Acid Leaching Mechanism |
| D. | Alkali Leaching Mechanism |
| Answer» C. Acid Leaching Mechanism | |
| 7. |
Some heterotrophic bacteria are present in the copper dumps which indirectly affect metal ________ by affecting the growth and activity of metal solubilizing _______ |
| A. | solubilization; bacteria |
| B. | solubilization; fungi |
| C. | activity; bacteria |
| D. | activity; fungi |
| Answer» B. solubilization; fungi | |
| 8. |
The maximum temperature that may reach in the interior dump of copper bioleaching is ______ |
| A. | 120 C |
| B. | 100 C |
| C. | 90 C |
| D. | 70 C |
| Answer» D. 70 C | |
| 9. |
What percentage of total world copper production do bioleach of copper alone contributes? |
| A. | 10% |
| B. | 17% |
| C. | 25% |
| D. | 33.3% |
| Answer» D. 33.3% | |
| 10. |
Which commercial bioleaching processes among the following involves piling up of uncrushed waste rock? |
| A. | In Situ |
| B. | Dump Leaching |
| C. | Heap Leaching |
| D. | Vat Leaching |
| Answer» C. Heap Leaching | |