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07/01/26-overseer grade 3-public health and sanitation

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.
Which surface water source is characterized by a "self-purification" power through oxidation?
a)
Lakes
b)
Rivers
c)
Ponds
d)
Oceans
2.
Why do Infiltration Galleries generally require less treatment compared to direct river water?
a)
They are located in high-pressure zones.
b)
The water is naturally filtered as it passes through the soil.
c)
They are treated with chemicals during collection.
d)
The water is collected from stagnant basins.
3.
What is the typical yield of a modern Tube Well?
a)
4–5 Liters/sec
b)
10–20 Liters/sec
c)
50–250 Liters/sec
d)
500–1000 Liters/sec
4.
A spring is classified as an "Artesian Spring" when:
a)
Water flows out due to ground slope.
b)
Water is collected via horizontal tunnels.
c)
Water is sandwiched between two impervious layers under pressure.
d)
Water is found in a shallow basin.
5.
Which type of tube well is used in areas with fine sand to prevent sand entry?
a)
Strainer Type
b)
Gravity Type
c)
Artesian Type
d)
Slotted or Shrouded Type
6.
What is the classification for an Open Well if its depth is 15 meters?
a)
Shallow
b)
Deep
c)
Tube Well
d)
Reservoir
7.
In sub-surface water schemes multiple infiltration wells are connected to a single:
a)
Gravity Spring
b)
Jack Well (Sump)
c)
Oxidation Pond
d)
Pressure Filter
8.
At what point does Sanitary Engineering begin?
a)
When searching for water sources.
b)
During treatment of river water.
c)
Once water becomes wastewater after use.
d)
When distributing water.
9.

Assertion (A): Ponds are generally considered less pure than lakes for drinking water purposes.
Reason (R): Ponds are smaller basins in low-lying areas where pollutants and sediments accumulate in stagnant water.

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.

10.

Assertion (A): Excessive pumping of an Open Well is a safe practice to increase water yield.
Reason (R): Tube wells are usually smaller in diameter (30 to 45 cm) compared to Open Wells.

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 false, but R is true.

d)

A is true, but R is false.