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Materials and Construction

Materials and Construction
The hardest material just prior to diamond in Mhos scale is

Calcite
Topax
Corrundum
Carborundum

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Materials and Construction
Which of the following is the hardest material?

Topaz
Quartz
Flourite
Corrundum

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Materials and Construction
The phenomenon in which slow extension of material takes place with the time at constant load is called

Ductility
Plasticity
Creep
Elasticity

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Materials and Construction
German silver used for decorative purposes contains maximum percentage of

Nickel
Silver
Copper
Zinc

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

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

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Materials and Construction
An elastic behaviour of materials is expressed in terms of

Stress-strain curve
Relaxation time
Hysterisis loop area
None of these

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