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Materials and Construction

Materials and Construction
__________ is a donor impurity for semi-conductors.

Gallium
None of these
Antimony
Boron

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Materials and Construction
A material no longer behaves elastically beyond

Elastic limit
Plastic limit
Breaking load
Limiting load

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Materials and Construction
In cold working of metal as compared to its hot working

Yield stress, hardness and fatigue strength is not at all affected
Appreciable strain hardening is produced
Cracks and blow holes are eliminated
Ductility and impact strength improves

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Materials and Construction
Cold work tool steel should have

High wear resistance
High toughness
All of these
Poor hardenability

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Materials and Construction
Invar contains the highest percentage of

Cobalt
Tungsten
Vanadium
Iron

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Materials and Construction
The softest material in Mho's scale (for measuring hardness) is

None of these
Gypsum
Talc
Rubber

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