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10th Class Mental Ability Logical Reasoning Question Bank Logic

  • question_answer
    Direction: In each of the following questions two statements are given followed by two three or four conclusions numbered I, II, III, and IV. You have to take the given statements to be true even if they seem to be at variance from the commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
    Statements: All stars are sun. All sun are moons, Conclusions:            
    I.   All moons are stars
    II. Some moons are stars

    A) Only conclusion I follows            

    B) Only conclusion II follows

    C) Either conclusion I or II follows     

    D) Neither conclusion I nor II follows

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Since both the premises are universal and affirmative, the conclusion must be universal affirmative and should not contain the middle term. So, it follows that ?All stars are moons?. II is the converse of this conclusion and so it holds. Since the term moons are distributed in I without being distributed in any of the premises, so I does not follow.


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