15. B
    It is probable that one more captain would have spoken after captain L because the first mate, to speak after L was absent. In that case it could be true that D spoke sometime before O - who is another captain. The other choices are more likely to be false and incorrect to fit in the order given.

16. B
    The choices A, C, D and E conditions would fail to comply with the order given in the question M, D, N, G, L, O, A.

    

    B choice is the only additional possible order.

17. B
    As Nick was not exposed to disease A (except from Jack) Jack could not have contracted disease A from Nick. Thus, statement I is incorrect. Since it takes two days from the time that the microbe A enters the body to the time that the first symptoms appear, Jack could have noticed the symptoms of the disease two days after he was bitten. Thus statement II could be true. If the fly that bit Jack was not a carrier of the microbe A, Jack would not have been exposed to the disease A. Thus, he would not have shown symptoms of the disease. Therefore, statement III could not be true.

18. D
    It is not possible that Nick could have showed symptoms of disease A on February 8, as it takes two days for the symptoms to appear, and Nick was in contact with Jack on February 7. Thus, statement I could not be true. Since there was no other possibilities of exposure to disease A than those mentioned in the five statements, Nick could not have been bitten by a fly that carried the microbe A on February 6. However, Nick could have been bitten by a fly that did not carry the microbe A. Thus statement II could be true. Similarly, Jack could have been bitten by a bee that did not carry the microbe A, on February 5. Thus statement III could be true.

19. D
    Jack could have been bitten by a fly which did not carry the microbe A, on February 5. Thus the statement I could be true. Jack could not have been bitten by a mosquito which carried the microbe A as it is stated that there were no other possibilities of exposure to Disease A other than what was described in the five statements. Thus, statement II is not true. If Jack showed symptoms of the disease, Nick could have contracted the disease from Jack since he was in contact with Jack on February 7. Thus, statement II could not be true.

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Index

PART VI Practice Tests
Drill :
Section 1 : Verbal Section
Section 2 : Quantitative Section
Section 3 : Analytical Section
Section 4 : Quantitative Section
Section 5 : Verbal Section
Section 6 : Analytical Section
Section 7 : Quantitative Section

Answer Explanation To The Drill
Section 1 : Verbal Section
Section 2 : Quantitative Section
Section 3 : Analytical Section
Section 4 : Quantitative Section
Section 5 : Verbal Section
Section 6 : Analytical Section
Section 7 : Quantitative Section