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Worksheets08/01/26-overseer grade 3-public health and sanitation
Total questions: 10
Worksheet time: 4mins
Name
Class
Date
1.
A tube well is being designed for a major city’s public water supply. Which of the following specifications would most likely be adopted for this project?
a)
Diameter of 10 cm and yield of 5 l/s
b)
Diameter of 40 cm and yield of 50 l/s
c)
Diameter of 15 cm and yield of 4 l/s
d)
Diameter of 60 cm and yield of 100 l/s
2.
Which classification is correctly assigned to a tube well with a depth of 95 meters?
a)
Shallow Tube Well
b)
Open Well
c)
Deep Tube Well
d)
Cavity Well
3.
In a 'Cavity Type' tube well, how does the water primarily enter the well system?
a)
Through a wire mesh strainer horizontally
b)
Through a gravel pack radially
c)
From the bottom in a spherical flow pattern
d)
Through longitudinal slots in the casing
4.
A specific soil layer is found to have high porosity but almost zero permeability. This layer is best described as an:
a)
Aquifer
b)
Aquiclude
c)
Aquitard
d)
Aquifuge
5.
Why is the 'Slotted/Shrouded' type well preferred over the 'Strainer' type in very fine sandy formations?
a)
It is more economical to construct.
b)
It uses a wire mesh that filters fine particles better.
c)
The gravel pack (shrouding) acts as a natural filter to prevent clogging.
d)
It can tap multiple aquifers simultaneously.
6.
The downward movement of water through the soil layers under the influence of gravity is known as:
a)
Infiltration
b)
Runoff
c)
Percolation
d)
Transpiration
7.
Which of the following is a characteristic of a 'Perched Aquifer'?
a)
It is found between two deep impervious layers.
b)
It is under high artesian pressure.
c)
It is a local unconfined aquifer supported by a shallow impervious layer.
d)
It has the highest yield among all aquifer types.
8.
Which material is an example of an 'Aquifuge'?
a)
Sand and Gravel
b)
Saturated Clay
c)
Solid Granite
d)
Sandy Clay
9.
Assertion (A): Clay is highly porous but acts as a poor source for water extraction.
Reason (R): The voids in clay are not interconnected, resulting in extremely low permeability.
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): Strainer type tube wells are the most common type used in India.
Reason (R): They are highly suitable for aquifers consisting of very fine sandy soil.
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.
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