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Negative effect of high compression ratio in an engine is;It can lead to engine knocking or detonation, whereby secondary explosion occurs after the spark plug has fired, causing excessive rapid burning of mixture and a pinging or knocking noise. This can damage the engine/can rod cylinder.
Operational difference between external circlip and an internal circlip is;An external circlip fits into a groove on the outside of a shaft and is so made that it tends to contract in diameter while an internal circlip fits into a groove on the inside of a hole and is so made that it tends to expand and increase its diameter.
Function of an air hole of a bunsen burner is;To allow air to enter and mix with the laboratory gas from the jet.
Boyle's law for an ideal gas using kinetic theory is;Halving the volume doubles the number of collision per unit time hence the state of change of momentum will also double.
Functional zone of an ideal urban centre are;Central Business District (CBD)Industrial/manufacturing zoneResidential zone