Question

2. The ignition temperatures of four substances at P, Q, R, and S, are 125,270,155 and 310-
degree centigrade respectively. Which of the following pairs of substances catches fire at
250degree centigrade?
A) Q and S
B) P and R
C) R and S
D) P and Q

Answer 1

Answer:

B) P and R.

Explanation:

Once the ignition or kindling temperature is attained, the substance starts burning. As the given temperature doesn't match the ignition temperatures of Q and S, they don't burn.