Q. The velocity of sound in air is independent of changes in its

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Q. The Al₂O₃ content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

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Q. Number of electrons in the outermost shell of a semi-conductor material is

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Q. The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the

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Q. Tip of the match stick contains a mixture of

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Q. Which of the following is not an ore of aluminium ?

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Q. Heat treatment of steel is done to mainly change its __________ properties.

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Q. Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

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Q. Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that

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Q. The hardness of a grinding wheel is specified by the

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Q. Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.

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Q. While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ x Tm (where, Tm Melting temperature).

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Q. The factor of safety for brittle materials (having elongation < 5%) is based on the __________ stress.

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Q. Carburettor in a spark ignition engine is used to

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Q. __________ are not emitted by radioactive substances.

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Q. The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is

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Q. Which of the following is an inedible oil ?

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Q. Light year is the unit of

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Q. Ingrannular corrosion occurs __________ stainless steel.

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Q. In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of

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