Free Logical Deductions MCQs with Answers
240 Logical Deductions MCQs from Analytical and Logical Reasoning, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Logical deductions require conclusions to be drawn from stated facts, conditions and relationships without adding outside information. The work includes handling all, some and none statements, necessary and sufficient conditions, ordering restrictions, true or false conclusions, and the difference between what must be true and what could be true.
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Read the Logical Deductions notesFree MDCAT chapter notes with key terms240 questions · page 5 of 12
- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: If all engineers are intelligent, and no intelligent person is lazy, it logically follows that no engineer can be lazy (Conclusion I).
Correct answer: Both I and II follow- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: This is an invalid syllogism. The "parrots that are crows" might be a completely separate group from the "parrots that are birds." There…
Correct answer: Neither follows- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: The statement "Some flowers are red" can be rephrased as "Some red things are flowers," so Conclusion II is valid.
Correct answer: Only II follows- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: We know that there is a group of tables that are also chairs. Since no chair is wood, that specific group of tables (the ones that are…
Correct answer: Only I follows- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: This is a valid transitive relationship: if all books are papers and all papers are words, then all books must be words (Conclusion I).
Correct answer: Both I and II follow- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: Since there is an overlap between pens and boxes, and the entire set of boxes is within the set of papers, there must be an overlap…
Correct answer: Only I follows- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: If all mobiles are a part of the larger group of devices, it logically follows that some devices are mobiles (Conclusion II).
Correct answer: Only II follows- A. All cats are dogs
- B. Some dogs are cats
- C. Some animals are not cats
- D. All animals are cats
Explanation: Not all animals are cats because some animals are dogs. Logical deduction allows only "some animals are not cats" as certain.
Correct answer: Some animals are not cats- A. All roses fade quickly
- B. Some roses fade quickly
- C. Some flowers may not be roses
- D. No rose fades quickly
Explanation: While some flowers fade quickly, we cannot conclude anything about roses specifically.
Correct answer: Some flowers may not be roses- A. Only I follows
- B. Only II follows
- C. Both I and II follow
- D. Neither follows
Explanation: We cannot conclude anything about teachers being rich. But some rich people being educated is directly possible from the statement.
Correct answer: Only II follows- A. True
- B. False
- C. Uncertain
- D. None
Explanation: Some rectangles being red does not guarantee any square is red. So, the conclusion is uncertain.
Correct answer: Uncertain- A. Only I follows
- B. Only II follows
- C. Both follow
- D. Neither follows
Explanation: "All pencils are erasers" implies some erasers are pencils. But nothing can be concluded about pens being erasers.
Correct answer: Only II follows- A. The ground is wet
- B. The ground is dry
- C. The ground may be wet or dry
- D. None
Explanation: The statement only guarantees wet ground when it rains. If it is not raining, ground could be wet or dry.
Correct answer: The ground may be wet or dry- A. Only I follows
- B. Only II follows
- C. Both follow
- D. Neither follows
Explanation: There is no direct connection between students and intelligence.
Correct answer: Neither follows- A. All doctors are mortal
- B. Some mortals are doctors
- C. Some humans are not doctors
- D. All humans are doctors
Explanation: Some humans are doctors implies some humans may not be doctors.
Correct answer: Some humans are not doctors- A. Only I follows
- B. Only II follows
- C. Both follow
- D. Neither follows
Explanation: Some mammals can fly → some flying creatures are mammals. Nothing is concluded about birds.
Correct answer: Only II follows- A. Ali passed the exam
- B. Ali failed the exam
- C. Cannot say about Ali
- D. None
Explanation: Since every student passed and Ali is a student, he must have passed.
Correct answer: Ali passed the exam- A. Librarian
- B. Professor
- C. Teacher
- D. Instructor
Explanation: A librarian is the caretaker of the library and would most probably know the whereabouts of the book and help you find it.
Correct answer: Librarian- A. Parsley
- B. Basil
- C. Dill
- D. Mayonnaise
Explanation: Parsley, basil, and dill are all different forms of herbs. Therefore, they can be categorized together.
Correct answer: Mayonnaise- A. Meetings
- B. Sports
- C. Students
- D. Tests
Explanation: The term education system generally refers to schooling. For schooling, the only necessity is students to teach.
Correct answer: Students