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Building Materials

Building Materials
The stones obtained by blasting are used as

Aggregates for concrete
Road metal
Ballast in railways
All listed here

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Building Materials
The initial setting time for ordinary Portland cement as per IS specifications should not be less than

30 minutes
10 minutes
60 minutes
600 minutes

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Building Materials
Rapid hardening cement contains

Di-calcium silicate
Tri-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino-ferrite

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Building Materials
For melting one tonne of cast iron

All listed here
20 kg limestone is required
One quintal coke is required
700 m3 air is required

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Building Materials
Permanent magnets are made of high carbon steel and

35% of cobalt
15% of cobalt
45% of cobalt
20% of cobalt

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Building Materials
Wrought iron is used for

Columns and struts
None to these
Structural works in beams
Small sized water pipes

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