1.

Assertion:Knocking lowers the efficiency of the engine Reason:Fuel with minimum knocking property is preferred

Answer»

If both ASSERTION and REASON are true and the reason is the correct explanation of the assertion
If both assertion and reason are true butreason is not the correct explanation of the assertion
if assertion is true but reason is false
If the assertion and reason both are false

Solution :Knocking involves the production of metallic SOUND due to irregular burning of the fuel . This irregular burning lowers the efficiency of the ENGINE


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