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33. Which one of the following can also act as alubricant in the machines?a) Iron fillingsb) Polish on machines n machinec) Flow of water through the machined) flow of compreĹsed and purjfied air. |
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Answer» Small shuttles and wheels on axles made from single moleculescan be sped up with a small amount of water. hence option (c) is correct. |
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