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  • Question
  • 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

  • Correct Answer
  • Only I follows 

    Explanation
    Some dogs are rats. All rats are trees.

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

    All rats are trees. Some trees are not dogs.

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


    Logical Deduction problems


    Search Results


    • 1. 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
    • 2. Statements: No rabbit is lion. Some horses are lions. All rabbits are tables.

      Conclusions:

      1. Some tables are lions.
      2. Some horses are rabbits.
      3. No lion is table.


    • Options
    • A. None follows
    • B. Only either I or III follows
    • C. Only II and III follow
    • D. Only III follows
    • E. None of these
    • Discuss
    • 3. Statements: Some uniforms are covers. All covers are papers. All papers are bags.

      Conclusions:

      1. All covers are bags.
      2. Some bags are covers, papers and uniforms.
      3. Some uniforms are not papers.


    • Options
    • A. Only I follows
    • B. Only I and II follow
    • C. Only III follows
    • D. All I, II and III follow
    • E. None of these
    • Discuss
    • 4. Statements: All trees are flowers. No flower is fruit. All branches are fruits.

      Conclusions:

      1. Some branches are trees.
      2. No fruit is tree.
      3. No tree is branch.


    • Options
    • A. None follows
    • B. Only either I or III follows
    • C. Only II follows
    • D. Only either I or III, and II follow
    • E. None of these
    • Discuss
    • 5. Statements: All snakes are trees. Some trees are roads. All roads are mountains.

      Conclusions:

      1. Some mountains are snakes.
      2. Some roads are snakes.
      3. Some mountains are trees.


    • Options
    • A. Only I follows
    • B. Only II follows
    • C. Only III follows
    • D. Both I and II follow
    • E. None follows
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • Discuss
    • 10. 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


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