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  • Question
  • Statements: All doors are buses. All buses are leaves. No leaf is a flower.

    Conclusions:

    1. No flower is a door.
    2. No flower is a bus.
    3. Some leaves are doors.
    4. Some leaves are buses.


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

  • Correct Answer
  • All follow 

    Explanation
    IV is the converse of the second premise and so it holds.

    All doors are buses. All buses are leaves.

    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 doors are leaves'. III is the converse of this conclusion and so it holds.

    All buses are leaves. No leaf is a flower.

    Since both the premises are universal and one premise is negative, the conclusion must be universal negative and should not contain the middle term. So, it follows that 'No bus is flower'. II is the converse of this conclusion and so it holds.

    All doors are buses. No bus is flower.

    As discussed above, it follows that 'No door is flower'. I is the converse of this conclusion and so it also holds.


    Logical Deduction problems


    Search Results


    • 1. Statements: Some trains are roads. No road is jungle. All flowers are jungles.

      Conclusions:

      1. Some trains are flowers.
      2. Some trains are jungles.
      3. Some flowers are trains.
      4. No road is flower.


    • Options
    • A. None follows
    • B. Only II follows
    • C. Only III follows
    • D. Only IV follows
    • E. All follow
    • Discuss
    • 2. Statements: All cups are glasses. Some glasses are bowls. No bowl is a plate.

      Conclusions:

      1. No cup is a plate.
      2. No glass is a plate.
      3. Some plates are bowls.
      4. Some cups are not glasses.


    • Options
    • A. None follows
    • B. Only either I or III follows
    • C. Only II and III follow
    • D. Only III and IV follow
    • E. None of these
    • Discuss
    • 3. Statements: Some bricks are trees. All trees are pens. All pens are boats.

      Conclusions:

      1. Some boats are bricks.
      2. Some pens are bricks.
      3. Some trees are bricks.
      4. Some bricks are boats.


    • Options
    • A. Only I and II follow
    • B. Only III and IV follow
    • C. None follows
    • D. All follow
    • E. None of these
    • Discuss
    • 4. Statements: Some dogs are rats. All rats are trees. Some trees are not dogs.

      Conclusions:

      1. Some trees are dogs.
      2. All dogs are trees.
      3. All rats are dogs.
      4. No tree is dog.


    • Options
    • A. None follows
    • B. Only I follows
    • C. Only I and II follow
    • D. Only II and III follow
    • E. All follow
    • Discuss
    • 5. Statements: All benches are desks. Some desks are roads. All roads are pillars.

      Conclusions:

      1. Some pillars are benches.
      2. Some pillars are desks.
      3. Some roads are benches.
      4. No pillar is bench.


    • Options
    • A. None follows
    • B. Only either I or IV, and III follow
    • C. Only either I or IV follows
    • D. Only either I or IV, and II follow
    • E. All follow
    • Discuss
    • 6. 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
    • Discuss
    • 7. Statements: Some tigers are lions. Some lions are rabbits. Some rabbits are horses.

      Conclusions:

      1. Some tigers are horses.
      2. Some rabbits are tigers.
      3. Some horses are lions.
      4. All horses are rabbits.


    • Options
    • A. All follow
    • B. None follows
    • C. Only I and II follow
    • D. Only II and IV follow
    • E. Only IV follows
    • Discuss
    • 8. Statements: Some spoons are bowls. All bowls are knives. All knives are forks.

      Conclusions:

      1. All spoons are forks.
      2. All bowls are forks.
      3. Some knives are bowls.
      4. Some forks are spoons.


    • Options
    • A. Only II and III follow
    • B. Only II and IV follow
    • C. Only III and IV follow
    • D. All follow
    • E. None of these
    • Discuss
    • 9. Statements: All pencils are birds. All birds are skies. All skies are hills.

      Conclusions:

      1. All pencils are hills.
      2. All hills are birds
      3. All skies are pencils.
      4. All birds are hills.


    • Options
    • A. Only I and II follow
    • B. Only I and III follow
    • C. Only III and IV follow
    • D. All follow
    • E. None of these
    • Discuss
    • 10. Statements: No tree is fruit. All fruits are stones. All stones are rains.

      Conclusions:

      1. No stone is tree.
      2. No rain is tree.
      3. Some rains are fruits.
      4. Some rains are trees.


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


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