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71
Good quality sand is never obtained from
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Answer: Option C
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72
Water paint is a
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Answer: Option D
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73
A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
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Answer: Option C
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74
The commonly used lime in white washing, is
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Answer: Option B
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75
Plywood is made from
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Answer: Option A
Solution:
Plywood is made from common timber. It is a type of engineered wood product manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. This cross-graining technique enhances the strength and stability of the plywood, making it suitable for various applications in construction, furniture-making, and other industries.

Bamboo fibre is not typically used in the production of plywood. While bamboo can be processed into various building materials, including bamboo plywood, it is not the primary material for traditional plywood production.

Teak wood is a valuable hardwood known for its durability and water resistance, but plywood is not exclusively made from teak wood. Common timber species such as pine, cedar, and spruce are more commonly used in plywood production.

Asbestos sheets are not used in the manufacture of plywood. Asbestos is a hazardous material and has been largely phased out of construction materials due to health concerns.

Therefore, Option A: Common timber is the correct material from which plywood is made.
76
Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
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Answer: Option C
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77
Bitumen may be dissolved in
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Answer: Option D
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78
The percentage of alumina and silica in good fire clay vary respectively is
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Answer: Option A
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79
Due to attack of dry rot, the timber
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Answer: Option C
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80
Rapid hardening cement attains early strength due to
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Answer: Option A
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