Civil war Day 14 Oct 8 LSGD plastering and pointing

A type of defect which forms a conical hole on the plastered surface is termed as

• Peeling
• Blistering
• Popping
• Blooming

Answer explanation

Popping occurs due to unsound materials like lime particles expanding and forming conical holes in plaster.

Product of high grade gypsum which sets rapidly and produces excellent finish

• Thistle hardwall
• Snowcrete and colourcrete cements
• Sirapite plaster
• Scagliola plaster

Answer explanation

Thistle HardWall gypsum plaster: it is a quick-drying undercoat plaster, used for internal walls, with setting time about 2 hours.

------ are used to press mortar and spread it uniformly

• Trowel
• Aluminium rod
• Floats
• Brush

Answer explanation

Floats are used to press and spread mortar evenly, ensuring a uniform plaster surface.

When pearl ash is calcined with Plaster of Paris, ______ is obtained.

• Kenee's cement plaster
• Martin's cement plaster
• Parian cement plaster
• None of these

Answer explanation

when pearl ash is calcined with Plaster of Paris, Martin’s Cement (or Martin’s plaster) is obtained.

The lath in plastering is used to prevent the

• Cracks in the plastered surface
• Swelling of the plastered surface
• Depressions in the plastered surface
• Projections in the plastered surface

Answer explanation

Lath provides a mechanical bond and prevents cracking in plaster surfaces.

_______________ surface is prepared when it is desired to give acoustical treatment to the hall or room.

• Acoustic Plaster
• Marble plaster
• Barium plaster
• Gypsum plaster

Answer explanation

Acoustic plaster uses porous materials to absorb sound and improve room acoustics.

In plastering, the 1st coat is called ___________ and its thickness should be _______ mm

• Rendering coat, 6-9
• Floating coat, 6-9
• Floating coat, 10-15
• Rendering coat,10-15

Answer explanation

The rendering coat, the first plaster layer, is 10–15 mm thick and provides the base for later coats.

Before plastering, the surface has to be

• Rough
• Smooth
• Cemented
• Heated

Answer explanation

A rough surface ensures good adhesion of plaster to the wall background.

Thickness of load bearing walls in any case is not less than

• 200 mm
• 150 mm
• 100 mm
• 250 mm

Answer explanation

Load-bearing walls must be at least 200 mm thick to ensure structural stability.

In a lime-cement plaster, ratio 1:1:6 corresponds to:

• Lime:cement:sand
• Cement:Lime:sand
• Lime:sand:gravel
• Cement:sand:gravel

Answer explanation

A 1:1:6 lime-cement plaster mix means 1 part cement, 1 part lime, and 6 parts sand for balanced strength and workability.