D47 CHECK YOUR LEVEL

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.

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.

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.

The minimum width of parapet wall on bridges as per IRC standards is:

• 200 mm
• 250 mm
• 300 mm
• 500 mm

Answer explanation

According to IRC standards, the minimum width of a parapet is 300 mm.

The most commonly used cross drainage structure in minor irrigation works is:

• Aqueduct
• Siphon
• Super passage
• Culvert

Answer explanation

Culverts are economical and suitable for small discharges.

Full form of HFL in bridge drawings is:

• High Flood Level
• High Footing Level
• Horizontal Flow Level
• Hydraulic Flow Limit

Answer explanation

HFL stands for High Flood Level, indicating the highest known water level.