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Mechanical Engineering Objective Questions { Material Science }



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

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

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

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

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

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

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

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