For the manufacture of Portland cement, the proportions of raw materials used are
lime 63% ; silica 22% ; other ingredients 15%
lime 22% ; silica 63% ; other ingredients 15%
silica 40% ; lime 40% ; other ingredients 20%
silica 70% ; lime 20% ; other ingredients 10%
Correct answer is A
No explanation has been provided for this answer.
Brittleness of cold is due to an excess of
sulphur
carbon
phosphorus
silicon
Correct answer is C
No explanation has been provided for this answer.
Due to attack of dry rot, the timber
cracks
shrinks
reduces to powder
none of these
Correct answer is C
No explanation has been provided for this answer.
Which one of the following is acid resistant asbestos
actinolite asbestos
amosite asbestos
anthophylite asbestos
crocidolite asbestos
All the above
Correct answer is E
No explanation has been provided for this answer.
Kaolin is chemically classified as
metamorphic rock
argillaceous rock
calcareous rock
silicious rock
Correct answer is B
No explanation has been provided for this answer.
The plastics made from cellulose resin
are as clear as glass
are tough and strong
possess excellent electrical properties
All the above
Correct answer is D
No explanation has been provided for this answer.
The main constituent of fly-ash is
aluminium oxide
silica
ferrous oxide
All of these
Correct answer is D
No explanation has been provided for this answer.
Wrought iron contains carbon about
1.5% to 5.5%
0.5% to 1.75%
0.1% to 0.25%
none of these
Correct answer is C
No explanation has been provided for this answer.
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