D64 QUIZ OF THE DAY

Which IS code specifies mild steel and medium tensile steel bars for reinforcement?

• IS 2062
• IS 456
• IS 432 Part I
• IS 1786

Answer explanation

Mild steel and medium tensile steel bars should conform to IS 432 Part I as per RCC specifications.

The standard 'U' type hook in mild steel bars has a clear diameter equal to how many times the diameter of the bar?

• 2 times
• 3 times
• 4 times
• 6 times

Answer explanation

The clear diameter of a standard 'U' type hook is four times the diameter of the bar as per IS 2502.

In formwork, the operation of removing the formwork without damaging the concrete is known as:

• Centering
• Stripping
• Propping
• Shoring

Answer explanation

The removal of formwork without damaging the concrete is called stripping.

Plywood formwork can typically be reused for how many repetitions?

• 5–8 times
• 10–12 times
• 20–25 times
• 30–35 times

Answer explanation

Plywood formwork can be reused 20 to 25 times due to its durability and resin coating.

Which reinforcement method involves placing steel bars in vertical grooves of a brick wall and filling with grout?

• Horizontal reinforcement
• Hoop iron reinforcement
• Vertical reinforced core
• Mesh reinforcement

Answer explanation

Vertical reinforced core method leaves grooves in brickwork, inserts bars, and fills with grout for strength.

The anchorage length of straight bar in compression is specified as per which IS code?

• IS 456

• IS 2062
• IS 2502
• IS 1786

Answer explanation

Anchorage length requirements for bars in compression are given in IS 456:2000.

In reinforced masonry walls, mild steel bars of what minimum diameter are used as longitudinal reinforcement?

• 4 mm
• 5 mm
• 6 mm
• 8 mm

Answer explanation

A 6 mm diameter mild steel bar is used as longitudinal reinforcement in reinforced masonry walls.

Formwork for circular works like arches and domes is called:

• Moulding
• Centering
• Shoring
• Propping

Answer explanation

For circular works such as arches and domes, the formwork is termed centering.

Which type of formwork material has the highest initial cost but can be reused many times with a smooth finish?

• Timber formwork
• Plywood formwork
• Steel formwork
• Plastic formwork

Answer explanation

Steel formwork has a high initial cost but offers many reuses and a smooth surface finish.

What is the minimum cover for reinforcement bars in masonry to avoid corrosion?

• 5 mm
• 8 mm
• 10 mm
• 20 mm

Answer explanation

To avoid corrosion in reinforced masonry, a minimum cover of 10–15 mm is recommended.