D24 QUIZ OF THE DAY

Which type of plaster is used to make a room soundproof?

• Keene’s cement plaster
• Acoustic plaster
• Gypsum plaster
• Asbestos plaster

Answer explanation

Acoustic plaster is designed to absorb sound, making it ideal for soundproofing rooms.

What is the thickness of the first coat in two-coat plastering?

• 2 mm to 3 mm
• 6 mm to 9 mm
• 9 mm to 10 mm
• 12 mm to 15 mm

Answer explanation

The first coat, also known as the rendering coat, is typically 9–10 mm thick.

Which finish involves throwing small pebbles onto wet plaster?

• Scrapped finish
• Sand faced finish
• Pebble dash finish
• Textured finish

Answer explanation

Pebble dash finish is created by throwing pebbles onto freshly applied plaster.

What is the use of a 'float' in plastering?

• Checking verticality
• Applying mortar
• Smoothing plastered surfaces
• Cutting grooves

Answer explanation

A float is a wooden tool used to smooth the surface of plaster.

Which material is used for DPC and is not a permanent solution?

• Cement concrete
• Bituminous felt
• Plastic sheets
• Hot bitumen

Answer explanation

Plastic sheets like black polythene are cheap but not durable for long-term DPC.

What causes 'blistering' in painted surfaces?

• Bad ventilation
• Sunlight exposure
• Water vapor
• Poor adhesion

Answer explanation

Blistering is caused by trapped water vapor forming bubbles under paint.

What is the recommended thickness for DPC cement concrete at plinth level?

• 10 mm
• 25 mm
• 40 mm to 150 mm
• 5 mm to 10 mm

Answer explanation

The thickness for DPC cement concrete usually ranges from 40 mm to 150 mm.

What is the main objective of applying paint on metal surfaces?

• To resist rust
• To soften the metal
• To increase weight
• To make it shiny

Distemper is applied on which type of surface?

• Metal
• Timber
• Plastered surface
• Concrete

Which chemical is used in anti-termite treatment with 0.5% concentration?

• DDT
• BHC
• Aldrin
• Chlordane