Environmental Engineering MCQs | Environmental Engineering Multiple Choice Questions & Answers

1 Assertion A : The consumption of water increases with increase in the distribution pressure.

Reason R : Higher distribution pressure causes more loss and waste of water.

Select your answer according to the coding system given below

A Both A and R are true and R is the correct explanation of A
B Both A and R are true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

Answer: Both A and R are true and R is the correct explanation of A
2 Which of the following causes a decrease in per capita consumption ?
A use of metering system
B good quality of water
C better standard of living of the people
D hotter climate

Answer: use of metering system
3 If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be
A 100000m3
B 150000m3
C 180000m3
D 270000 m3

Answer: 270000 m3
4 The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
A 9500
B 9800
C 10100
D 10920

Answer: 10920
5 Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
A N = y + R
B y = N + R
C R = N + y
D R > (N + y)

Answer: N = y + R
6 The maximum discharge of a tube-well is about
A 5 litres/sec
B 50 litres/sec
C 500 litres/sec
D 1000 litres/see

Answer: 50 litres/sec
7 Which of the following is not a water borne disease ?
A Dysentery
B Cholera
C Typhoid
D Maleria

Answer: Maleria
8 The most common cause of acidity in water is
A Carbon Dioxide
B Oxygen
C Hydrogen
D Nitrogen

Answer: Carbon Dioxide
9 The maximum permissible limit for flouride in drinking water is
A 0.1 mg/litre
B 1.5 mg/litre
C 5 mg/litre
D 10 mg/litre

Answer: 1.5 mg/litre
10 If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is i) presumptive coliform test ii) confirmed coliform test iii) completed coliform test The correct answer is
A only (i)
B both (i) and (ii)
C both (i) and (iii)
D all (i), (ii) and (iii)

Answer: 0.01 sec
11 Turbidity is measured on
A Standard Silica Scale
B Standard Cobalt Scale
C Standard Platinum Scale
D Platinum Cobalt Scale

Answer: Standard Silica Scale
12 On standard silica scale, the turbidity in drinking water should be limited to
A 10 ppm
B 20 ppm
C 30 ppm
D 50 ppm

Answer: 10 ppm
13 Orthotolidine test is used for determination of
A Dissolved Oxygen
B Residual Chlorine
C Biochemical Oxygen Demand
D Dose Of Coagulant

Answer: Residual Chlorine
14 The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A 0.01 to 0.05 ppm
B 0.05 to 0.5 ppm
C 0.5 to 1.0 ppm
D 1.0 to 5.0 ppm

Answer: 0.05 to 0.5 ppm
15 The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
A 1 mg/litre
B 10 mg/litre
C 100 mg/litre
D 1000 mg/litre

Answer: 10 mg/litre
16 The length of rectangular sedimentation tank should not be more than
B 2B
C 4B
D 8B

Answer: 4B
17 For a given discharge, the efficiency of sedimentation tank can be increased by
A Increasing The Depth Of Tank
B Decreasing The Depth Of Tank
C Increasing The Surface Area Of Tank
D Decreasing The Surface Area of tank

Answer: Increasing The Surface Area Of Tank
18 The amount of coagulant needed for coagulation of water increases with i) increase in turbidity of water ii) decrease in turbidity of water iii) increase in temperature of water iv) decrease in temperature of water The correct answer is
A (i) and (ii)
B (i)and(iv)
C (ii) and (iii)
D (ii) and (iv)

Answer: (i)and(iv)
19 Alum as a coagulant is found to be most effective when pH range of water is
A 2 to 4
B 4 to 6
C 6 to 8
D 8 to 10

Answer: 6 to 8
20 The chemical most commonly used to increase speed of sedimentation of sewage is
A Sulphuric Acid
B Copper Sulphate
C Lime
D Sodium Permanganate

Answer: Lime

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