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Engineering Materials

Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Duralumin
Silver metal
Invar
Hastelloy

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Engineering Materials
Crystal structure of a material is, generally, examined by

Optical microscope
Naked eye
X-ray techniques
Metallurgical microscope

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Engineering Materials
Which of the following represents the allotropic forms of iron?

Alpha iron and beta iron
Alpha iron, beta iron and gamma iron
Body centered cubic iron and face centered cubic iron
Alpha iron, gamma from and delta iron

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Engineering Materials
The toughness of a material __________ when it is heated.

None of these
Increases
Decreases
Remain same

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Engineering Materials
Bronze is an alloy of

Copper and zinc
Copper and tin
None of these
Copper, tin and zinc

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Engineering Materials
The defect which takes place due to imperfect packing of atoms during crystallization is known as

Surface defect
Line defect
None of these
Point defect

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