Q: 5
A washing machine has three temperature bands for different kinds of fabrics: fragile fabrics are
washed at temperatures between 15 and 30 degrees Celsius; normal fabrics are washed at
temperatures between 31 and 60 degrees Celsius; heavily soiled and tough fabrics are washed at
temperatures between 61 and 100 degrees Celsius.
Which of the following contains only values that are in different equivalence partitions?
Options
Discussion
C , since each value (25, 45, 75) belongs to a different valid partition: fragile, normal, and tough fabrics. The others either repeat partitions or include out-of-bounds values (like 12 in D), which ISTQB usually doesn't want. Pretty sure this matches how equivalence classes are supposed to be picked, but if you’ve seen different on real exams let me know.
C not D. 25, 45, 75 each from a unique partition (fragile, normal, tough), saw similar on practice.
D imo since 12, 35, and 55 seem spread out but is the question asking for only valid (in-range) values or can we pick out of bounds? If only partition ranges count then maybe C fits better.
This looks like one from my exam last year in some exam reports. C has one value from each valid partition so that's the safest pick here.
Its C. Each value in 25, 45, and 75 is from a different valid partition and stays inside the defined temp ranges. If 12 was allowed in D, that would cross into an invalid partition, but ISTQB usually sticks to strictly valid input classes. Anyone see exceptions to that rule?
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