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Materials and Construction

Materials and Construction
Gunmetal and bronze are not corroded by the action of

Nitric acid (< 25%)
Wet chlorine
Synthetic detergent solution
Hydrochloric acid (10%)

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Materials and Construction
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a

Metallic alloy
Glass
Cermet
Thermosetting plastic

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Materials and Construction
'Age hardening' of duralumin is due to

Both A & B
Copper
Magnesium
Neither A nor B

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Materials and Construction
Which of the following is produced by condensation polymerisation?

Poly vinyl chloride
Bakelite
Polythene
Polystyrene

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Materials and Construction
Babbit metal (used for making bearings) comprises of

Zinc and aluminium
Mainly tin (85%) and lead
Saw dust and iron dust mixture
Copper and aluminium

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Materials and Construction
Tempering of steel is done to make it

Rollable
Soft
Brittle
Hard

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