Which of the following would you prefer to reduce friction between sliding parts of a machine operating at high temperatures?

Oil

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Sand

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Graphite

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Wax

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Solution

The correct option is C Graphite
Using sand between two machine parts will increase friction. Oil, wax and graphite can act as lubricants to decrease friction. However, graphite, being dry, can operate better at high temperatures. Wax and oil will evaporate at high temperature.

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Similar questions

How will you reduce friction between those machine parts which rub against each other ? Give the simplest method.

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