Q. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

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Q. Name the safety device used to protect the boiler, when the water level falls below a minimum level.

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Q. Earing is a defect found in steels after the following metal working operation (s).

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Q. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

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Q. Hydrogen can be

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Q. __________ wire is never used for making the heating element.

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Q. Which of the following has the least oili-ness ?

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Q. Surface finish of casting does not depend upon the

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Q. Load cells used for the measurement of weight has

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Q. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

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Q. For the Stoke's law to be valid in the case of a falling sphere in a fluid, the

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Q. The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their

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Q. A material having good damping property is likely to have

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Q. Exposure to __________ accelarates the degradation of plastics.

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Q. Steel produced from phosphatic iron is __________ in nature.

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Q. __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

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Q. Out of the following, the most melleable material is

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Q. Addition of silicon to aluminium improves its

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Q. Which of the following properties of a solid is not dependent on crystal imperfection ?

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Q. In a good rimming steel

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