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Materials and Construction

Materials and Construction
Which of the following pairs of elements may form an alloy?

Iron & carbon
Iron & mercury
Platinum & mercury
None of these

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Materials and Construction
Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of

Copper
Aluminium
Brass
High carbon steel

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Materials and Construction
Aluminium storage vessel can be used to store

Hydrochloric acid (10%)
None of these
Ferrous sulphate
Aqua regia

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Materials and Construction
Platinum and silver are corroded by

Phosphoric acid
Caustic soda solution
None of these
Sulphuric acid (10%)

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Materials and Construction
Hardening of steel is not possible unless it is heated __________ critical point.

Between the first & second
Above the highest
Above the lowest
Between the second & third

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Materials and Construction
Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?

Alumel
Invar
Constantan
Chromel

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