Syllogism

J&K Bank PO · Reasoning Ability · 80 practice questions with answers and explanations: 43 Easy, 37 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: 1. Some engineers are chairs 2. Some chairs are lamps Conclusions: I. Some lamps are not engineers II. All chairs are lamps Assume every group named has at least one member, take the statements to be true even if they differ from common facts, and decide which conclusion(s) follow.

  1. Only conclusion I follows
  2. Only conclusion II follows
  3. Either conclusion I or II follows
  4. Neither conclusion I nor II follows
Show answer

Answer: D. Treating each group as non-empty and drawing every possible Venn arrangement that fits the statements: conclusion I fails in at least one, and conclusion II fails in at least one.

Sample Medium question 5

Statements: 1. Some doctors are shirts 2. Some roads are not shirts 3. Some doctors are roads Conclusions: I. All roads are doctors II. Some doctors are not shirts Assume every group named has at least one member, take the statements to be true even if they differ from common facts, and decide which conclusion(s) follow.

  1. Only conclusion I follows
  2. Only conclusion II follows
  3. Either conclusion I or II follows
  4. Neither conclusion I nor II follows
Show answer

Answer: D. Treating each group as non-empty and drawing every possible Venn arrangement that fits the statements: conclusion I fails in at least one, and conclusion II fails in at least one.

Sample Medium question 6

Statements: 1. All books are boats 2. No lamps are books Conclusions: I. Some boats are books II. No lamps are boats Assume every group named has at least one member, take the statements to be true even if they differ from common facts, and decide which conclusion(s) follow.

  1. Only conclusion I follows
  2. Only conclusion II follows
  3. Either conclusion I or II follows
  4. Neither conclusion I nor II follows
Show answer

Answer: A. Treating each group as non-empty and drawing every possible Venn arrangement that fits the statements: conclusion I follows in all of them, and conclusion II fails in at least one.

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