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Home ‣ Logical Reasoning ‣ Logical Deduction See What Others Are Saying!
  • Question

  • Statements: All oceans are rivers. Some springs are rivers. All wells are springs.

    Conclusions:

    1. Some springs are oceans.
    2. Some wells are rivers.
    3. Some rivers are oceans.
    4. No well is river.


  • Options
  • A. None follows
  • B. Only either I or III, and IV follow
  • C. Only either II or IV, and III follow
  • D. All follow
  • E. Only either II or IV, and I follow

  • Correct Answer
  • Only either II or IV, and III follow 

    Explanation
    III is the converse of the first premise and so it holds.

    All oceans are rivers. Some springs are rivers.

    Since the middle term 'rivers' is not distributed even once in the premises, no definite conclusion follows.

    All wells are springs. Some springs are rivers.

    Since the middle term 'springs' is not distributed even once in the premises, no definite conclusion follows. However, II and IV involve the extreme terms and form a complementary pair. Thus, either II or IV follows.

    More questions

    • 1. Here are some words translated from an artificial language.
      tamceno means sky blue
      cenorax means blue cheese
      aplmitl means star bright
      Which word could mean "bright sky"?

    • Options
    • A. cenotam
    • B. mitltam
    • C. raxmitl
    • D. aplceno
      • Discuss
    • 2. Look carefully at the sequence of symbols to find the pattern. Select correct pattern:

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 3. Statement: The end of a financial year is the ideal time to take a look at the performance of various companies.

      Assumptions:

      1. All the companies take such a review at the end of a financial year.
      2. The performance data of various companies is available.


    • Options
    • A. Only assumption I is implicit
    • B. Only assumption II is implicit
    • C. Either I or II is implicit
    • D. Neither I nor II is implicit
    • E. Both I and II are implicit
      • Discuss
    • 4. The Pacific yew is an evergreen tree that grows in the Pacific Northwest. The Pacific yew has a fleshy, poisonous fruit. Recently, taxol, a substance found in the bark of the Pacific yew, was discovered to be a promising new anticancer drug.

    • Options
    • A. Taxol is poisonous when taken by healthy people.
    • B. Taxol has cured people from various diseases.
    • C. People should not eat the fruit of the Pacific yew.
    • D. The Pacific yew was considered worthless until taxol was discovered.
      • Discuss
    • 5. Secretly is to openly as silently is to

    • Options
    • A. scarcely
    • B. impolitely
    • C. noisily
    • D. quietly
      • Discuss
    • 6. Statements: All trucks fly. Some scooters fly.

      Conclusions:

      1. All trucks are scooters.
      2. Some scooters do not fly.


    • Options
    • A. Only conclusion I follows
    • B. Only conclusion II follows
    • C. Either I or II follows
    • D. Neither I nor II follows
    • E. Both I and II follow
      • Discuss
    • 7. Statement: Nuclear power cannot make a country secure.

      Courses of Action:

      1. We must stop further expenses on increasing our nuclear power.
      2. We must destroy our nuclear capability.
      3. We must concentrate on improving our diplomatic relations.


    • Options
    • A. Only I follows
    • B. Only II follows
    • C. Only III follows
    • D. Only I and III follow
      • Discuss
    • 8. Statements: Prime age school-going children in urban India have now become avid as well as more regular viewers of television, even in households without a TV. As a result there has been an alarming decline in the extent of readership of newspapers.

      Conclusions:

      1. Method of increasing the readership of newspapers should be devised.
      2. A team of experts should be sent to other countries to study the impact of TV. on the readership of newspapers.


    • Options
    • A. Only conclusion I follows
    • B. Only conclusion II follows
    • C. Either I or II follows
    • D. Neither I nor II follows
    • E. Both I and II follow
      • Discuss
    • 9. Look at this series: 544, 509, 474, 439, ... What number should come next?

    • Options
    • A. 404
    • B. 414
    • C. 420
    • D. 445
      • Discuss
    • 10. 3 8 13 18 23 28 33

    • Options
    • A. 39 44
    • B. 38 44
    • C. 38 43
    • D. 37 42
    • E. 33 38
      • Discuss

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