Q. A material is said to be allotropic, if it has

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Q. Closed packed hexagonal space lattice is found in

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Q. The hardness and tensile strength in austenitic stainless steel can be increased by

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Q. Iron ore is, usually, found in the form of

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Q. The hardness of steel increases if it contains

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Q. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

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Q. Ferrite and pearlite makes the steel soft and ductile.

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Q. The lower critical temperature

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Q. The quenching of steel from the upper critical point results in a fine grained structure.

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Q. An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

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Q. Which of the following has a fine gold colour and is used for imitation jewellery?

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Q. When the steel is normalised, its

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Q. White cast iron has a high tensile strength and a low compressive strength.

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Q. Cast iron is a

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Q. The hardness is the property of a material due to which it

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Q. Malleable cast iron is produced

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Q. Smelting is the process of

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Q. The percentage of carbon in cast iron varies from

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Q. Tungsten when added to steel __________ the critical temperature.

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Q. Silicon when added to copper improves

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