Environmental Engineering - Online Test
Q1. Consider the following statements :
Assertion (A) :Curvature correction must be applied when the sights are long.
Reason (R) : Line of collimation is not a level line but is tangential to the level
line.
Of these statements
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. One hour triangular unit hydrograph of a watershed has the peak discharge of 60
m3 /sec cm at 10 hours and time base of 30 hours. The Φ index is 0.4 cm per hour
and base flow is 15 m3 /sec.
The catchment area of the watershed is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. Two primary air pollutants are
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. Match List-I (Estimation method) with List-II (Corresponding indicator) and
select the correct answer using the codes given below the lists :
List-I List-II
a. Azide modified Winkler method
for dissolved oxygen 1. Eriochrome Black T
b. Dichromate method for chemical
oxygen demand 2. Ferroin
c. EDTA titrimetric method for
hardness 3. Potassium chromate
d. Mohr or Argentometric method
for chlorides 4. Starch
Codes:
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. A weir on a permeable foundation with downstream sheet pile is shown in the
figure below. The exit gradient as per Khosla’s method is
Answer : Option C
Explaination / Solution:
No Explaination.
Q6. Identical surcharges are placed at ground surface at sites X and Y , with soil
conditions shown alongside and water table at ground surface. The silty clay
layers at X and Y are identical. The thin sand layer at Y is continuous and freedraining
with a very large discharge capacity. If primary consolidation at X is
estimated to complete in 36 months, what would be the corresponding time for
completion of primary consolidation at Y ?
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. Total suspended particulate matter (TSP) concentration in ambient air is to be
measured using a high volume sampler. The filter used for this purpose had an
initial dry weight of 9.787g. The filter was mounted in the sampler and the initial
air flow rate through the filter was set at 1.5min/m3. Sampling continued for
24 hours. The airflow after 24 hours was measured to be 1.4 min/m3. The dry
weight of the filter paper after 24 hour sampling was 10.283g. Assuming a linear
decline in the air flow rate during sampling, what is the 24 hour average TSP
concentration in the ambient air?
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. Chlorine gas (8 mg/L as Cl2) was added to a drinking water sample. If the free
chlorine residual and pH was measured to be 2 mg/L (as Cl2) and 7.5, respectively,
what is the concentration of residual OCl- ions in the water? Assume that the
chlorine gas added to the water is completely converted to HOCl and OCl-.
Atomic Weight of Cl: 35.5
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. The ordinates of a 2-h unit hydrograph at 1 hour intervals starting from time t = 0, are 0, 3, 8, 6, 3, 2 and 0 m3/s. Use trapezoidal rule for numerical integration, if required.
A storm of 6.6 cm occurs uniformly over the catchment in 3 hours. If Φ - index is
equal to 2 mm/h and base flow is 5 m3/s, what is the peak flow due to the storm?
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Anaerobically treated effluent has MPN of total coliform as 106 / mL. After
chlorination, the MPN value declines to 102 / mL. The percent removal (%R) and log removal (logR) of total coliform MPN is
Answer : Option D
Explaination / Solution:
No Explaination.
