Odd one outEasy1 mark
1(h)
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:
Detergent, X-rays, Sewage, Oil spills
Topic: Water pollutants
Previous-year question practice database
Answer
Exam answer
Odd one out: X-RAYS. Category of the others: WATER POLLUTANTS.
Explanation
Detergents, sewage and oil spills all pollute WATER. X-RAYS are a form of RADIATION and cause radiation pollution — they are not even a substance.
THE METHOD: find the category that covers THREE of the four terms and whatever falls outside it is the odd one. Here the category is defined by the MEDIUM polluted.
The five kinds of pollution in the syllabus — air, water, soil, noise and radiation — make an efficient checklist for every odd-one-out question in this chapter.
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