Cummins Turbo Technologies
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Cummins Turbo Technologies Service Engineering Intern Interview Question

I interviewed in Columbus, IN and was asked:
"You are in a boat which is in the middle of a pond and you are holding a rock in your hand. You throw the rock into the lake. Does the water level of the lake rise?"
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Part of a Service Engineering Intern Interview Review - one of 7 Cummins Turbo Technologies Interview Reviews

Answers & Comments

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No right or wrong answer. They just want to see how you think.
- Interview Candidate on Apr 18, 2012 Flag Response
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The water level will drop. When you hold the rock, the extra displaced volume of water equals the weight of the rock. When you throw the rock into the lake, displaced volume is the size of the rock, which is less.
- banmuyuan on Apr 20, 2012 Flag Response
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both wrong. the water level does not change. at first the density the boat has is density of the boat + density of rock affecting water level. in the final situation the boat has gotten rid of the rock's density, but the rock (and its density) have been added to the lake, so we still have density of boat + density of rock affecting water level. location doesn't change physics.
- Anonymous on Oct 20, 2012 Flag Response

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