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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
Knocking sound occurs in engine when fuel
  • A
    Ignites slowly
  • ✓
    Ignites rapidly
  • C
    Contains water
  • D
    Is mixed with machine oil
✓

Answer

Correct option: B.
Ignites rapidly
b
(b)Knocking - Sudden and irregular burning of the fuel mixture causing jerks against the piston and gives rise to violent sound. This is known as knocking.

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