D47 CHECK YOUR LEVEL

The most suitable foundation for bridge piers in deep sandy soils is:

• Well foundation
• Raft foundation
• Pile foundation
• Open foundation

Answer explanation

Well foundations are preferred for deep sandy beds as they resist scouring and provide stability.

Which of the following is used as protective work in bridge substructure?

• Gabions
• Curtain walls
• Arches
• Suspension cables

Answer explanation

Gabions are used to protect abutments and piers from scour and erosion.

In canal irrigation, the term 'outlet discharge factor' refers to:

• Discharge per unit time
• Discharge per unit area
• Discharge per hectare
• Discharge per square meter

Answer explanation

Outlet discharge factor = total discharge / area of irrigation = cumec/ha.

A trap used in house drainage to prevent foul gases from re-entering is:

• Gully trap
• Intercepting trap
• Grease trap
• Floor trap

Answer explanation

Intercepting trap blocks foul gases from public sewers entering the house drainage.

Which of the following units is used in the design of water supply pipes?

• Hertz
• Frictional loss
• Kilo Pascal
• Fixture unit

Answer explanation

Fixture unit represents probable water demand of a fixture and is used for pipe sizing.

The best suited material for bridge expansion joints is:

• Rubber
• Concrete
• Bitumen
• PVC

Answer explanation

Rubber accommodates expansion and contraction and is flexible for bridge joints.

Which factor directly affects the capacity of a canal section?

• Canal slope
• Hydraulic mean depth
• Silt factor
• Bed width

Answer explanation

Hydraulic mean depth influences the flow capacity through Manning’s formula.

Concrete is weak in:

• Compression
• Tension
• Shear
• Bearing

Answer explanation

Concrete has high compressive strength but very low tensile strength.

The IS code used for design of irrigation channels is:

• IS 456
• IS 10262
• IS 10430
• IS 3370

Answer explanation

IS 10430 is used for design of irrigation channels.

The bridge component that directly supports deck slab is:

• Pier cap
• Girder
• Bearing
• Abutment

Answer explanation

Girders carry the load of the deck and transfer it to piers.