MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Chlorides are estimated by titration with a standard silver nitrate solution by using _______as indicator. |
| A. | Potassium manganate |
| B. | Potassium chloride |
| C. | Potassium chromate |
| D. | Potassium dichromate |
| Answer» D. Potassium dichromate | |
| 2. |
State whether the following statement is True or False.Gelatin liquefying bacteria are helpful in the manufacturing of photographic films. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
What is the concentration of H+ ions in moles/L in water if the pOH value is 6? |
| A. | 10-6 |
| B. | 10-7 |
| C. | 10-8 |
| D. | 10-9 |
| Answer» D. 10-9 | |
| 4. |
State whether the following statement is True or False.Carbonate hardness can be removed by adding lime to water. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
What is the indicator used in EDTA method? |
| A. | Potassium chromate |
| B. | Potassium dichromate |
| C. | Potassium chloride |
| D. | Erio chrome, black T |
| Answer» E. | |
| 6. |
In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced? |
| A. | Clark's method |
| B. | Hehner's method |
| C. | Versenate method |
| D. | EDTA method |
| Answer» B. Hehner's method | |
| 7. |
Which of the following statement is/are correct regarding coliform bacteria?1. It is gram negative2. It is rod shaped bacteria3. It is a harmless aerobic microorganism |
| A. | 1, 2, 3 |
| B. | 2, 3 |
| C. | 1, 3 |
| D. | 1,2 |
| Answer» B. 2, 3 | |
| 8. |
State whether the following statement is True or False.Threshold odour number testing is preferred in hot water. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Which of the following statement is wrong regarding turbidity? |
| A. | It is an extent to which light is absorbed by particles in the water |
| B. | It is expressed in ppm |
| C. | It depends on the fineness of particle present in the water |
| D. | Turbidity rod is a laboratory method to measure turbidity |
| Answer» E. | |
| 10. |
Which of the following statement is wrong regarding permanent hardness? |
| A. | It is also called carbonate hardness |
| B. | It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium |
| C. | It cannot be removed by boiling |
| D. | It requires special methods of water softening to get removed |
| Answer» B. It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium | |
| 11. |
If the PO value is 6, what does it imply? |
| A. | No perceptible odour |
| B. | Very faint odour |
| C. | Very distinct odour |
| D. | Extremely strong odour |
| Answer» E. | |
| 12. |
If the acid and gas are formed in the multiple tube fermentation technique, the test is _____ |
| A. | Positive |
| B. | Continued |
| C. | Negative |
| D. | Discarded |
| Answer» B. Continued | |
| 13. |
The permissible limit of pH preferred for potable water is ___ppm. |
| A. | 6.5-9 |
| B. | 7-8.5 |
| C. | 10-14 |
| D. | 0-7 |
| Answer» B. 7-8.5 | |
| 14. |
One JTU is equivalent to turbidity produced by |
| A. | 1mg of fine silica dissolved in 1L of distilled water |
| B. | 1g of fine silica dissolved in 1L of distilled water |
| C. | 1g of fine silica dissolved in 1ml of distilled water |
| D. | 1mg of fine silica dissolved in 1ml of distilled water |
| Answer» B. 1g of fine silica dissolved in 1L of distilled water | |
| 15. |
Which bacteria results in the corrosion of iron and steel pipes embedded in soil? |
| A. | Escherichia coli bacteria |
| B. | Bacterium coli bacteria |
| C. | Iron bacteria |
| D. | Sulphur bacteria |
| Answer» E. | |
| 16. |
The range of temperature of water that is required to do the temperature test is__ 0C. |
| A. | 10-25 |
| B. | 0-25 |
| C. | 10-30 |
| D. | 20-30 |
| Answer» B. 0-25 | |
| 17. |
One degree of hardness is equivalent to ___ ppm |
| A. | 2 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» C. 10 | |