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Logical deductions
8 MDCAT Logical reasoning questions with answers and explanations.
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All doctors are graduates. All graduates are educated. Conclusion: All doctors are educated. Does the conclusion follow?
- 1 Yes, it follows
- 2 No, it does not follow
- 3 Only some doctors
- 4 It contradicts the statements
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Correct answer: Yes, it follows
Doctors are inside the group of graduates, and graduates are inside the group of educated people, so doctors are inside educated people.
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Some pens are books. All books are papers. Conclusion: Some pens are papers. Does the conclusion follow?
- 1 No, it does not follow
- 2 Yes, it follows
- 3 All pens are papers
- 4 It contradicts the statements
Show answer
Correct answer: Yes, it follows
The pens that are books must also be papers, because all books are papers. So some pens are papers.
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All cats are animals. Some animals are wild. Conclusion: Some cats are wild. Does the conclusion follow?
- 1 Yes, it follows
- 2 No, it does not necessarily follow
- 3 All cats are wild
- 4 No cat is wild
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Correct answer: No, it does not necessarily follow
The wild animals may all be other animals, such as lions. The statements do not say that any cat is wild.
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No bird is a mammal. All bats are mammals. Conclusion: No bat is a bird. Does the conclusion follow?
- 1 No, it does not follow
- 2 Some bats are birds
- 3 Yes, it follows
- 4 It contradicts the statements
Show answer
Correct answer: Yes, it follows
Bats are mammals and no mammal is a bird, so no bat can be a bird.
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All A are B. No B is C. Conclusion: No A is C. Does the conclusion follow?
- 1 Yes, it follows
- 2 No, it does not follow
- 3 Some A are C
- 4 It cannot be tested
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Correct answer: Yes, it follows
Every A is a B, and no B is a C, so no A can be a C.
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Some roses are flowers. All flowers are plants. Conclusion: All roses are plants. Does the conclusion follow?
- 1 Yes, it follows
- 2 No, only some roses are known to be plants
- 3 No rose is a plant
- 4 It contradicts the statements
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Correct answer: No, only some roses are known to be plants
Only the roses that are flowers are known to be plants. The statements say nothing about the other roses.
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All students are readers. Ali is a student. What follows?
- 1 Ali is a reader
- 2 Ali is not a reader
- 3 Ali may not be a reader
- 4 All readers are students
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Correct answer: Ali is a reader
Ali belongs to the group of students, and every student is a reader.
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If it rains, the match is cancelled. The match was not cancelled. What follows?
- 1 It rained
- 2 It did not rain
- 3 The match was played in the rain
- 4 Nothing can be said
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Correct answer: It did not rain
If rain always leads to cancellation, then no cancellation means there was no rain.