GK QUESTION#3343
Consider the following statements:
1. Ignition temperature is the lowest temperature at which a substance catches fire.
2. Kerosene has a high ignition temperature while coal has a low ignition temperature.
3. Inflammable substances have very low ignition temperatures.
Which of the above statements are correct?
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Answer
C. 1 and 3 only
Show Explanation
Explanation
Ignition temperature is the lowest temperature at which a combustible substance catches fire under the specified conditions. In the usual school comparison, kerosene is easier to ignite than a lump of coal, so statement 2 reverses the intended comparison. Inflammable substances ignite readily, supporting statements 1 and 3. Actual ignition behaviour also depends on material form and test conditions.