Multiple choice

What is the difference between spontaneous combustion and rapid combustion?

  1. In spontaneous combustion, substance suddenly bursts into flames while in rapid combustion, substance burns slowly.

  2. In spontaneous combustion, substance burns rapidly into flames while in rapid combustion, substance burns suddenly in to flames.

  3. In spontaneous combustion, substance burns suddenly into flames and in rapid combustion, substance burns rapidly into flames.

  4. In spontaneous combustion, substance burns slowly but in rapid combustion, substance burns rapidly into flames.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spontaneous combustion occurs when a material suddenly bursts into flames without an external ignition source, typically due to internal chemical reactions or heat buildup (like coal or oily rags). Rapid combustion is when a substance burns rapidly with a flame after being ignited by an external source. Option C correctly captures that spontaneous combustion is sudden (without external trigger) while rapid combustion is fast burning (with external trigger).

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