The issue would be that the memory was not installed or was not detected by the system. If this happens, the system boot will fail and a beep code is heard. The system would not show anything since all of the software are in the memory which was not installed or detected.
Fist one correct.
second wrong because not all heat is used for work, some of it lost to other.
third wrong because fuel burn inside is called combustion engine
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Note:
% is Modulus,
So it's taken as num mod 7, if that evaluates to 0 there is no reminder therefore divisible by 7.