MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The temperature of disinfection is inversely proportional to the killing of organisms. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
When the coefficient of dilution is 1, then which of the following statement is correct? |
| A. | Time of contact is more important than dosage |
| B. | The dosage is more important than time of contact |
| C. | Concentration and time are equally important |
| D. | Efficiency of dilution decreases. |
| Answer» D. Efficiency of dilution decreases. | |
| 3. |
Efficiency of dilution decreases rapidly when the coefficient of dilution is ____________ |
| A. | 0 |
| B. | 1 |
| C. | <1 |
| D. | >1 |
| Answer» E. | |
| 4. |
The number of organisms in disinfection process can be expressed by ____________ |
| A. | Cn *t p = Constant |
| B. | C n / tp = Constant |
| C. | C q * Np = Constant |
| D. | C q / Np = Constant |
| Answer» D. C q / Np = Constant | |
| 5. |
For changing the concentration of disinfectant, the disinfecting efficiency is expressed by ____________ |
| A. | C n *t p = Constant |
| B. | C n/ t p = Constant |
| C. | C q * Np = Constant |
| D. | C q / Np = Constant |
| Answer» B. C n/ t p = Constant | |
| 6. |
The expression loge N1/N = – kt m Where m is a constant such that m>1 represents ____________ |
| A. | Rate of the kill will remains constant with time |
| B. | Rate of the kill will increase with time |
| C. | Rate of the kill will decrease with time |
| D. | Rate of the kill is directly proportional to time |
| Answer» C. Rate of the kill will decrease with time | |
| 7. |
The number of organisms destroyed is equal to the number of organisms remaining at time t = __________ |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 10 |
| Answer» B. 1 | |
| 8. |
The dimensional formula of rate constant used in Chicks law is ____________ |
| A. | 1/t |
| B. | 1/t2 |
| C. | 1/t3 |
| D. | t2 |
| Answer» B. 1/t2 | |
| 9. |
The integration of the expression of Chicks law is given by ____________ |
| A. | N1/N = ekt |
| B. | N1/N = kt |
| C. | N1/N = k/t |
| D. | N1/N = e-kt |
| Answer» E. | |
| 10. |
Consider the following variables.i. Concentration of disinfectantii. Concentration of organismsiii. Temperatureiv. Time of contactDisinfection is the function of which of the following variables? |
| A. | i, ii |
| B. | i, ii, iii |
| C. | i, ii, iii, iv |
| D. | ii, iii, iv |
| Answer» D. ii, iii, iv | |
| 11. |
THE_NUMBER_OF_ORGANISMS_IN_DISINFECTION_PROCESS_CAN_BE_EXPRESSED_BY?$ |
| A. | C<sup>n</sup> *t <sub>p</sub> = Constant |
| B. | C <sup>n</sup>/ t<sub>p</sub> = Constant |
| C. | C <sup>q</sup> * N<sub>p</sub> = Constant |
| D. | C <sup>q</sup> / N<sub>p</sub> = Constant |
| Answer» D. C <sup>q</sup> / N<sub>p</sub> = Constant | |
| 12. |
When the coefficient of dilution is 1, then which of the following statement is correct?$ |
| A. | Time of contact is more important than dosage |
| B. | The dosage is more important than time of contact |
| C. | Concentration and time are equally important |
| D. | Efficiency of dilution decreases. |
| Answer» D. Efficiency of dilution decreases. | |
| 13. |
Efficiency_of_dilution_decreases_rapidly_when_the_coefficient_of_dilution_is$ |
| A. | 0 |
| B. | 1 |
| C. | <1 |
| D. | >1 |
| Answer» E. | |
| 14. |
State_whether_the_following_statement_is_true_or_false. |
| A. | |
| B. | True |
| Answer» C. | |
| 15. |
For changing the concentration of disinfectant, the disinfecting efficiency is expressed b? |
| A. | C n *t p = Constant |
| B. | C n/ t p = Constant |
| C. | C q * Np = Constant |
| D. | C q / Np = Constant |
| Answer» B. C n/ t p = Constant | |
| 16. |
The expression loge N1/N = – kt m Where, m is a constant such that m>1 represents$ |
| A. | Rate of the kill will remains constant with time |
| B. | Rate of the kill will increase with time |
| C. | Rate of the kill will decrease with time |
| D. | Rate of the kill is directly proportional to time |
| Answer» C. Rate of the kill will decrease with time | |
| 17. |
The number of organisms destroyed is equal to the number of organisms remaining at time t= |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 10 |
| Answer» B. 1 | |
| 18. |
The dimensional formula of rate constant used in Chicks law is |
| A. | 1/t |
| B. | 1/t<sup>2</sup> |
| C. | 1/t<sup>3</sup> |
| D. | t<sup>2</sup> |
| Answer» B. 1/t<sup>2</sup> | |
| 19. |
The integration of the expression of Chicks law is given by |
| A. | N1/N = e<sup>kt</sup> |
| B. | N1/N = kt |
| C. | N1/N = k/t |
| D. | N1/N = e<sup>-kt</sup> |
| Answer» E. | |
| 20. |
Which of the following is the expression of Chicks law? |
| A. | Dy/Dt = k (N – y) |
| B. | Dy/Dt = k/(N – y) |
| C. | Dy/Dt = k (N + y) |
| D. | Dy/Dt = k (N * y) |
| Answer» B. Dy/Dt = k/(N ‚Äö√Ñ√∂‚àö√ë‚àö¬® y) | |
| 21. |
According to which of the following, organism destroyed by disinfection is proportional to organism remaining? |
| A. | Hazens equation |
| B. | Chicks law |
| C. | Darcy’s law |
| D. | Rose equation |
| Answer» C. Darcy‚Äö√Ñ√∂‚àö√ë‚àö¬•s law | |