Explore topic-wise MCQs in Environmental Engineering.

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.
Discussion
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.
Discussion
3.

Efficiency of dilution decreases rapidly when the coefficient of dilution is ____________

A. 0
B. 1
C. <1
D. >1
Answer» E.
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
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
Discussion
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
Discussion
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.
Discussion
13.

Efficiency_of_dilution_decreases_rapidly_when_the_coefficient_of_dilution_is$

A. 0
B. 1
C. <1
D. >1
Answer» E.
Discussion
14.

State_whether_the_following_statement_is_true_or_false.

A.
B. True
Answer» C.
Discussion
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
Discussion
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
Discussion
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
Discussion
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>
Discussion
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.
Discussion
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)
Discussion
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
Discussion