CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
For Dams, which option correctly gives the "sedimentation"?
A. Land area draining water into the reservoir
B. Safely release excess water
C. Sedimentation
D. Monitoring seepage, stability and structural condition
Correct Answer: C
Sedimentation: Sedimentation. Silt carried by rivers settles in reservoirs over time.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
For Dams, which option correctly gives the "reservoir"?
A. Reservoir
B. Safely release excess water
C. Store water for later use
D. Water drives turbines connected to generators
Correct Answer: A
Reservoir: Reservoir. A reservoir stores water impounded by a dam.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
For Dams, which option correctly gives the "spillway"?
A. Usable reservoir volume between operating levels
B. Safely release excess water
C. Reservoir
D. By its own weight
Correct Answer: B
Spillway: Safely release excess water. Spillways protect dams from overtopping during high inflows.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
For Dams, which option correctly gives the "hydropower"?
A. They regulate seasonal water supply
B. By its own weight
C. Safely release excess water
D. Water drives turbines connected to generators
Correct Answer: D
Hydropower: Water drives turbines connected to generators. Potential energy of stored water is converted to mechanical and then electrical energy.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
For Dams, which option correctly gives the "main purpose"?
A. Usable reservoir volume between operating levels
B. Safely release excess water
C. Store water for later use
D. Sedimentation
Correct Answer: C
Main purpose: Store water for later use. Storage dams regulate seasonal river flows for irrigation, water supply, power and flood control.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is 'live storage'?
A. It mainly regulates and diverts river flow with gates
B. Compacted soil and rock
C. Usable reservoir volume between operating levels
D. Store water for later use
Correct Answer: C
Live storage can be released for irrigation, water supply or power generation.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is 'dead storage' in a reservoir?
A. Safely release excess water
B. Reservoir
C. Water below the lowest normal outlet level
D. By its own weight
Correct Answer: C
Dead storage is generally unavailable for routine gravity release and often traps sediment.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What does a dam's catchment area mean?
A. Water below the lowest normal outlet level
B. It mainly regulates and diverts river flow with gates
C. Land area draining water into the reservoir
D. Valley abutments
Correct Answer: C
Rainfall and runoff from the catchment determine inflows.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is a key engineering requirement for safe dams?
A. Reservoir
B. Safely release excess water
C. Water below the lowest normal outlet level
D. Monitoring seepage, stability and structural condition
Correct Answer: D
Instrumentation and inspections detect problems before failure.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
Why are dams important to Pakistan's irrigated agriculture?
A. Water below the lowest normal outlet level
B. Usable reservoir volume between operating levels
C. They regulate seasonal water supply
D. It mainly regulates and diverts river flow with gates
Correct Answer: C
Storage helps transfer water from wet periods to crop-demand periods.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
How can a multipurpose dam reduce flood risk?
A. It mainly regulates and diverts river flow with gates
B. Compacted soil and rock
C. Water drives turbines connected to generators
D. By temporarily storing high flows
Correct Answer: D
Reservoir operation can attenuate flood peaks.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
How does a barrage differ from a large storage dam?
A. Water drives turbines connected to generators
B. It mainly regulates and diverts river flow with gates
C. Compacted soil and rock
D. Water below the lowest normal outlet level
Correct Answer: B
Barrages raise water level for diversion but usually provide far less storage than major dams.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
An arch dam transfers much of the water load into what?
A. Usable reservoir volume between operating levels
B. Valley abutments
C. By its own weight
D. Water below the lowest normal outlet level
Correct Answer: B
The curved structure carries force into strong rock on the sides of a narrow valley.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
How does a concrete gravity dam resist water pressure?
A. Water below the lowest normal outlet level
B. Safely release excess water
C. Water drives turbines connected to generators
D. By its own weight
Correct Answer: D
A gravity dam relies on its mass to resist the horizontal force of stored water.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What material primarily forms an earth-fill dam?
A. Compacted soil and rock
B. By temporarily storing high flows
C. Land area draining water into the reservoir
D. Monitoring seepage, stability and structural condition
Correct Answer: A
Earth-fill dams use compacted natural materials rather than a solid concrete wall.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What process gradually reduces reservoir storage capacity?
A. Store water for later use
B. Sedimentation
C. Safely release excess water
D. Valley abutments
Correct Answer: B
Silt carried by rivers settles in reservoirs over time.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is the artificial lake behind a dam called?
A. Reservoir
B. Compacted soil and rock
C. Valley abutments
D. Water drives turbines connected to generators
Correct Answer: A
A reservoir stores water impounded by a dam.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is the function of a dam spillway?
A. Water below the lowest normal outlet level
B. Valley abutments
C. Safely release excess water
D. Water drives turbines connected to generators
Correct Answer: C
Spillways protect dams from overtopping during high inflows.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
How does a hydroelectric dam generate electricity?
A. Water drives turbines connected to generators
B. Water below the lowest normal outlet level
C. Safely release excess water
D. Usable reservoir volume between operating levels
Correct Answer: A
Potential energy of stored water is converted to mechanical and then electrical energy.
CSS - PMS - CCE - PCS - Pakistan Affairs (P.A)
Dams
What is a primary purpose of a storage dam?
A. They regulate seasonal water supply
B. Water below the lowest normal outlet level
C. Store water for later use
D. Reservoir
Correct Answer: C
Storage dams regulate seasonal river flows for irrigation, water supply, power and flood control.