
D61 MASTER THE DAY
Authored by WINCENTRE CLASSES
Professional Development
Professional Development
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113 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of manhole is constructed at the start of a branch sewer and is less than 1m deep?
Answer explanation
Shallow manholes (0.75–0.9m) are inspection chambers constructed at the start of branch sewers.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which zone of pollution is known for maximum anaerobic decomposition and gas evolution?
Answer explanation
In the active decomposition zone, DO reaches zero and anaerobic processes dominate with H2S evolution.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which type of storm regulator works on siphonic action to divert excess water?
Answer explanation
Siphon spillways use siphonic action to move excess stormwater from the combined sewer to channels.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In which type of lake does the euphotic zone extend up to the hypolimnion?
Answer explanation
Oligotrophic lakes are deep with clear water; light penetrates to the hypolimnion supporting equilibrium.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the minimum cover diameter for a circular manhole cover as per IS?
Answer explanation
IS 1742 recommends a minimum diameter of 50 cm for circular manhole covers.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What happens during thermal stratification in lakes during summer?
Answer explanation
During summer, lakes stratify into epilimnion, metalimnion, and hypolimnion due to temperature differences.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which material is typically used for manhole walls?
Answer explanation
Manhole walls are made from brickwork, stone masonry or concrete for strength and durability.
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