Logical Deduction Questions and Answers

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Q11
If some managers are leaders and all leaders are decision-makers, then:
  • A All managers are decision-makers
  • B Some decision-makers are managers
  • C No managers are decision-makers
  • D All decision-makers are managers
Answer: Option B
Explanation: Chain reasoning with particular and universal statements.
Q12
No fish are mammals. All dolphins are mammals. Therefore:
  • A Some dolphins are fish
  • B No dolphins are fish
  • C All mammals are dolphins
  • D Some fish are mammals
Answer: Option B
Explanation: Universal negative and universal affirmative combination.
Q13
All successful people work hard. Some students work hard. What follows?
  • A Some students are successful
  • B All students are successful
  • C Some hard workers are students
  • D No students are successful
Answer: Option C
Explanation: Avoiding the fallacy of the undistributed middle term.
Q14
If all mathematicians are logical and no poets are logical, then:
  • A Some poets are mathematicians
  • B No mathematicians are poets
  • C All logical people are mathematicians
  • D Some mathematicians are poets
Answer: Option B
Explanation: Two universal premises leading to a universal conclusion.
Q15
Some birds are migratory. All migratory animals travel long distances. Therefore:
  • A All birds travel long distances
  • B Some birds travel long distances
  • C No birds travel long distances
  • D All animals that travel long distances are birds
Answer: Option B
Explanation: Particular and universal premise combination.
Q16
All metals conduct electricity. Some non-metals conduct electricity. What must be true?
  • A All electricity conductors are metals
  • B Some electricity conductors are not metals
  • C No non-metals conduct electricity
  • D All non-metals conduct electricity
Answer: Option B
Explanation: Dealing with overlapping categories and exceptions.
Q17
No reptiles are warm-blooded. All snakes are reptiles. Therefore:
  • A Some snakes are warm-blooded
  • B No snakes are warm-blooded
  • C All warm-blooded animals are snakes
  • D Some reptiles are snakes
Answer: Option B
Explanation: Chain of universal negative and universal affirmative.
Q18
Some teachers are professors. All professors have PhDs. What can be concluded?
  • A All teachers have PhDs
  • B Some teachers have PhDs
  • C No teachers have PhDs
  • D All PhD holders are teachers
Answer: Option B
Explanation: Valid conclusion from particular and universal premises.
Q19
All fruits contain seeds. Some vegetables are fruits. Therefore:
  • A All vegetables contain seeds
  • B Some vegetables contain seeds
  • C No vegetables contain seeds
  • D All seed-containing plants are vegetables
Answer: Option B
Explanation: Logical deduction with biological categories.
Q20
If no squares are triangles and all rectangles are squares, then:
  • A Some rectangles are triangles
  • B No rectangles are triangles
  • C All triangles are rectangles
  • D Some triangles are rectangles
Answer: Option B
Explanation: Geometric shape categorization logic.

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