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  • Question
  • Statements: All doors are roads. No road is fruit. Some flowers are doors.

    Conclusions:

    1. Some fruits are doors.
    2. Some fruits are flowers.
    3. Some roads are flowers.
    4. No fruit is flower.


  • Options
  • A. Only either II or III, and IV follow
  • B. Only either II or IV, and III follow
  • C. Only either II or IV, and I follow
  • D. Only either II or IV follows
  • E. All follow

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

    Explanation
    All doors are roads. No road is fruit.

    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 door is fruit.'

    Some flowers are doors. All doors are roads.

    Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some flowers are roads'. Ill is the converse of this conclusion and so it holds.

    Some flowers are roads. No road is fruit.

    Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some flowers are not fruits'. II and IV involve the extreme terms and form a complementary pair. Thus, either II or IV follows.


    Logical Deduction problems


    Search Results


    • 1. Statements: All players are spectators. Some spectators are theatres. Some theatres are dramas.

      Conclusions:

      1. Some dramas are spectators.
      2. Some players are dramas.
      3. Some theatres are players.
      4. All spectators are players.


    • Options
    • A. None follows
    • B. Only I and III follow
    • C. Only II follows
    • D. Only II and IV follow
    • E. All follow
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. Statements: All needles are threads. All threads are boxes. All trees are boxes.

      Conclusions:

      1. No needle is tree.
      2. Some trees are threads.
      3. Some boxes are needles.
      4. Some trees are needles.


    • Options
    • A. None follows
    • B. Only either I or IV follows
    • C. Only either I or IV, and II follow
    • D. Only III follows
    • E. Only either I or IV, and III follow
    • Discuss
    • 7. Statements: No house is school. All colleges are schools. All schools are teachers.

      Conclusions:

      1. No house is teacher.
      2. All colleges are teachers.
      3. Some teachers are not houses.
      4. No college is house.


    • Options
    • A. None follows
    • B. Only either I or IV follows
    • C. Only II, III and IV follow
    • D. All follow
    • E. Only either I or IV, and III follow
    • Discuss
    • 8. Statements: Some pearls are stones. Some stones are diamonds. No diamond is a gem.

      Conclusions:

      1. Some gems are pearls.
      2. Some gems are diamonds.
      3. No gem is a diamond.
      4. No gem is a pearl.


    • Options
    • A. Only I and II follow
    • B. Only III and IV follow
    • C. Only either I or IV and either II or III follow
    • D. Only III and either I or IV follow
    • E. None of these
    • Discuss
    • 9. Statements: All rods are bricks. Some bricks are ropes. All ropes are doors.

      Conclusions:

      1. Some rods are doors.
      2. Some doors are bricks.
      3. Some rods are not doors.
      4. All doors are ropes.


    • Options
    • A. Only I and II follow
    • B. Only I, II and III follow
    • C. Only either I or III, and II follow
    • D. Only either I or III, and IV follow
    • E. None of these
    • Discuss
    • 10. Statements: All myths are fictions. No fiction is novel. All novels are stories.

      Conclusions:

      1. No myth is novel.
      2. Some fictions are novels.
      3. Some fictions are myths.
      4. Some myths are novels.


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


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