D24 CHECK YOUR LEVEL

Which of the following stones is best suited for building construction in areas exposed to acid rain?

• Granite
• Marble
• Limestone
• Slate

Answer explanation

Granite is highly durable and resistant to chemical attacks, making it suitable for acid-prone regions.

Which IS code provides specifications for ordinary Portland cement?

• IS 383
• IS 456
• IS 269
• IS 10262

Answer explanation

IS 269:2015 is the Indian Standard for Ordinary Portland Cement.

Which brick is best suitable for use in damp conditions?

• Sun-dried brick
• Fly ash brick
• Laterite brick
• First-class burnt brick

Answer explanation

First-class burnt bricks are well-burnt, durable, and suitable for wet conditions.

The process of soaking bricks in water before use is called:

• Seasoning
• Curing
• Watering
• Wet backing

Answer explanation

Soaking bricks in water before laying is known as wet backing to prevent water absorption from mortar.

Pozzolanic materials are added to cement to improve its:

• Setting time
• Water demand
• Durability
• Bleeding

Answer explanation

Pozzolans enhance the durability and long-term strength of cement.

The ratio of cement:sand:aggregate in nominal M20 concrete mix is:

• 1:2:4
• 1:1.5:3
• 1:3:6
• 1:2.5:5

Answer explanation

M20 concrete has a nominal mix ratio of 1:1.5:3 for cement, sand, and aggregate respectively.

The moisture content in timber at which cell walls are saturated but no free water exists is called:

• Kiln dried
• Green
• Fibre saturation point
• Seasoned

Answer explanation

Fibre saturation point is the moisture content where timber is dimensionally stable.

Which of the following is used as a filler material in building construction?

• Gypsum
• Sand
• Silica
• Bitumen

Answer explanation

Sand is a common filler material used in mortars and concrete.

The depth of foundation depends on:

• Type of soil
• Water table
• Load of the structure
• All of the above

Answer explanation

Depth of foundation is influenced by soil type, water table, and structural loads.

Which floor finish is best for industrial buildings with heavy machine vibration?

• Terrazzo
• Vinyl
• Tiled floor
• Granolithic concrete

Answer explanation

Granolithic concrete floors are durable and resistant to wear and vibration.