Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

Environmental Engineering
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

Both A and R is true and R is the correct explanation of A

A is true but R is false

A is false but R is true

Both A and R is true but R is not the correct explanation of A

Both A and R is true and R is the correct explanation of A

A is true but R is false

A is false but R is true

Both A and R is true but R is not the correct explanation of A

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Environmental Engineering
The polluted water is one which

Is safe and suitable for drinking and domestic use

Is contaminated

Consists of undesirable substances rendering it unfit for drinking and domestic use

Contains pathogenic bacteria

Is safe and suitable for drinking and domestic use

Is contaminated

Consists of undesirable substances rendering it unfit for drinking and domestic use

Contains pathogenic bacteria

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Environmental Engineering
The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Only (i)

Both (i) and (iii)

Both (i) and (ii)

Only (iii)

Only (i)

Both (i) and (iii)

Both (i) and (ii)

Only (iii)

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Environmental Engineering
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(ii) and (iv)

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(ii) and (iv)

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Environmental Engineering
Which of the following values of pH represents a stronger acid?

3

5

4

2

3

5

4

2

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Environmental Engineering
Standard BOD is measured at

20°C - 5 day

20°C - 1 day

30°C - 5 day

25°C - 3 day

20°C - 5 day

20°C - 1 day

30°C - 5 day

25°C - 3 day

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Environmental Engineering

Environmental Engineering Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

Environmental Engineering The polluted water is one which

Environmental Engineering The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Environmental Engineering As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

Environmental Engineering Which of the following values of pH represents a stronger acid?

Environmental Engineering Standard BOD is measured at

Environmental Engineering
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

Environmental Engineering
The polluted water is one which

Environmental Engineering
The disinfection efficiency of chlorine increases by (i) Decreasing the time of contact (ii) Decreasing the temperature of water (iii) Increasing the temperature of water

Environmental Engineering
As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

Environmental Engineering
Which of the following values of pH represents a stronger acid?

Environmental Engineering
Standard BOD is measured at