Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is ________________?

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The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

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Addition of _____________________ to steel does not impart hardness?

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A dense structure of grinding wheel is not used for the_____________________?

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