D65 FACE THE CHALLENGE

In RCC, stirrups are primarily used to resist:

• Compression
• Bending
• Shear
• Torsion

Answer explanation

Stirrups are provided to resist shear forces in RCC members.

Which IS code specifies the requirements for coarse and fine aggregates?

• IS 456
• IS 383
• IS 269
• IS 800

Answer explanation

IS 383 covers specifications for coarse and fine aggregates.

The bearing length for timber lintels is generally:

• 50–75 mm
• 150–200 mm

• 250–300 mm
• 350–400 mm

Answer explanation

Timber lintels have a bearing length of 150–200 mm typically.

The product obtained by destructive distillation of coal is:

• Bitumen
• Tar
• Asphalt
• Cutback bitumen

Answer explanation

Tar is obtained by destructive distillation of coal, wood, or petroleum.

In highway construction, the minimum thickness of subgrade for National Highways is:

• 300 mm
• 400 mm
• 500 mm
• 600 mm

Answer explanation

IRC specifies a minimum 500 mm thick subgrade for National Highways.

Which RCC member carries loads mainly in compression?

• Beam
• Slab
• Column
• Lintel

Answer explanation

Columns are vertical members primarily carrying axial compression loads.

The free carbon content is higher in:

• Bitumen
• Tar
• Asphalt
• Cutback bitumen

Answer explanation

Tar contains higher free carbon content compared to bitumen.

In RCC, Fe 500 steel has a permissible tensile stress of:

• 230 N/mm²
• 240 N/mm²
• 275 N/mm²
• 300 N/mm²

Answer explanation

Fe 500 steel has a permissible tensile stress of 275 N/mm².

Which type of weld joins two plates overlapping at right angles?

• Butt weld
• Fillet weld
• Plug weld
• Slot weld

Answer explanation

Fillet welds are used to join plates at right angles.

The minimum grade of concrete for pre-stressed concrete as per IS is:

• M20
• M30
• M35
• M40

Answer explanation

IS codes specify M30 as the minimum grade for pre-stressed concrete.