QUESTION

CSAT

Easy

Reasoning

Prelims 2017

Four tests — Physics, Chemistry, Mathematics and Biology are to be conducted on four consecutive days, not necessarily in the same order. The Physics test is held before the test which is conducted after Biology. Chemistry is conducted exactly after two tests are held. Which is the last test held?

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Explanation

"Physics test is held before the test which is conducted after Biology."

This implies that Physics must be conducted before the test that comes after Biology. Conclusion: Physics cannot be the last test because Biology must occur after it.

"Chemistry is conducted exactly after two tests are held."

This means Chemistry is the third test in the sequence (after two tests have already been conducted). Conclusion: Chemistry cannot be the first, second, or last test. It must be the third.

"Which is the last test held?"

Given that Chemistry is the third test, and Physics and Biology must be placed in the first and second slots based on the first statement, the only remaining test for the fourth (last) position is Mathematics.

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