Building Materials MCQ

191.Clay and silt content in a good brick earth must be at least

• A. 50%

B. 40%

C. 30%

D. 25%

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192. Which of the following is the purest form of iron?

A. Castiron

B. Wrought iron

C. Mild steel

D. High carbon steel

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193. The stretcher bond in brick masonry can be used only when the thickness of the wall is

A. 90mm

B. 180mm

C. 190mm

D. 280 mm

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194. The plywood

A. Has good strength along the panel only

B. Can be spilled in the plane of the panel

C. Has greater impact resistance to blows than ordinary wood

D. Cannot be bent more easily than ordinary wood of same thickness

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195. Pick up the correct statement from the following:

A. The phenol is carbolicacid

B. The phenol is either extracted from coal-tar or prepared from benzene

C. Phenol reacts with formaldehyde, to form phenol formaldehyde resin

D. All the above

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196. The advantage of a clamp compared to a kiln for burning bricks is that

A. It takes less time to burn

B. It gives more output of first-class bricks

C. It has fewer initial cost

D. It is suitable when bricks are required in large numbers

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197. Pick up the correct statement from the following:

A. The solder material is an alloy that melts at a temperature above400°C

B. Brazing is done at temperatures above 600°C to1100°C

C. The brazing joint is stronger than the solder joint

D. All the above

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