1. The metallic structure of mild steel is
A.Body centred cubic
B.Face centred cubic
C.Hexagonal close packed
D.Cubic structure

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2. The crystal of alpha iron is
A.Body centred cubic
B.Face centred cubic
C.Hexagonal close packed
D.Cubic structure

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3. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
A.Molecular change
B.Physical change
C.Allotropic change
D.Solidus change

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4. Isotropic materials are those which have the same
A.Elastic properties in all directions
B.Stresses induced in all directions
C.Thermal properties in all directions
D.Electric and magnetic properties in all directions

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5. Paramagnetic alpha iron changes to gamma iron at
A.770°C
B.910°C
C.1440°C
D.1539°C

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6. The elastic stress strain behaviour of rubber is
A.Linear
B.Non-linear
C.Plastic
D.No fixed relationship

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7. Super conduction by metals is observed in the temperature range of
A.Below 10°K
B.Above 100°K
C.Around 0°C
D.Around 100°C

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