Syllogism

LSSSSB Non-Technical · Reasoning · 19 practice questions with answers and explanations: 10 Easy, 9 Medium, 0 Hard.

Sample questions

Sample Easy question 1

Statements: All cats are animals. All animals are living beings. Conclusion: All cats are living beings. Is this conclusion valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: A. This is a valid syllogistic chain: cats ⊂ animals ⊂ living beings.

Sample Easy question 2

Statements: Some pens are books. All books are papers. Conclusion: Some pens are papers. Is this conclusion valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: A. Since some pens are books and all books are papers, those same pens must be papers.

Sample Easy question 3

Statements: All squares are rectangles. Some rectangles are circles. Conclusion: Some squares are circles. Is this conclusion valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: B. The rectangles that are circles need not include any squares, so the conclusion does not follow logically.

Sample Medium question 4

Statements: All doctors are educated. Some educated people are rich. Conclusion: Some doctors are rich. Is this conclusion valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: B. The rich educated people need not be doctors, so the conclusion does not necessarily follow.

Sample Medium question 5

Statements: No fish are mammals. All whales are mammals. Conclusion: No whales are fish. Is this conclusion valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: A. Since whales are mammals and no mammals are fish, no whales can be fish.

Sample Medium question 6

Statements: Some books are pens. All pens are pencils. Conclusion: Some books are pencils. Is this valid?

  1. Valid
  2. Invalid
  3. Cannot be determined
  4. None of these
Show answer

Answer: A. The books that are pens must also be pencils, since all pens are pencils.

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