Q. How many molecules per unit cell are there in a face centred cubic lettice ?

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Q. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

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Q. When iron is rusted, it is

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Q. Wrought iron is having very high

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Q. Nickel base alloys with __________ are known as monel metal.

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Q. Presence of cobalt in steel improves its

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Q. How many atoms are there per unit cell in a body centred cubic lattice system ?

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Q. Post weld heat treatment is done by

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Q. __________ is a donor impurity for semi-conductors.

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Q. 'Age hardening' of duralumin is due to

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Q. Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?

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Q. The presence of impurities in iron

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Q. German silver is an alloy of copper, nickel and

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Q. Monel metal is an alloy of

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Q. Acetaldehyde is shipped in __________ drums.

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Q. The softest material in Mho's scale (for measuring hardness) is

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Q. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of

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Q. Plasticisers are added to polymers to improve their

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Q. The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.

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Q. The hardest material just prior to diamond in Mhos scale is

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