Question
The time required to kill 90% of the microorganisms in
a sample at a specific temperature is the a)Â Â Â Â Â Â thermal death point b)Â Â Â Â Â F value c)Â Â Â Â Â Â D value d)Â Â Â Â Â Z valueSolution
Explanation: The D -value  refers to time taken at a given temperature to reduce the population of exposed microorganisms by 90% or achieve a 1-log reduction.
What will come in place of the question mark (?) in the following number series?
21, 42, 67, 96, ?, 166
10, 10, 15, 30, 75, ?
What will come in place of the question mark (?) in the following series?
12, 13, 22, 47, 96, 177, ?
18, 30, 54, 90, 138, ?
Find the missing number in the given number series.
2, 5, 11, 23, 47, ?11          20          ?             64          112        192
...12, 14, 20, 32, ?, 82Â
What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
7 7 28 252 ?
...7   4   5   9   20    ?    160.5
