Logic — DU B.A. (Prog) Philosophy Previous Year Question Papers

1. Differentiate between the following: (Any Three) (a) A Sentence and a Proposition. (b) Inductive and Deductive argument. (c) Truth and Validity. (d) Argument and Explanation. 8. Test the validity of each syllogistic form using a Venn diagram. (Do any THREE) (4x3=12) 9. Can a valid standard-form categorical syllogism have a term distributed in a premise that appears undistributed in the conclusion? (5x1=5) 6. Rewrite each of the following syllogisms in standard form, and name its mood and figure: (Do any One) (6x1=6) Some travellers are not photographers. Since no travellers are imaginative people and all photographers are imaginative people. (a) Find the conversion and Obversion of the following (Any TWO) : (2x2=4) (i) No musicians are cruel. (ii) Some shopkeepers are smart investors. (iii) All snakes are poisonous. (b) Find the contraposition of the following (Any (i) Some men do not respect women. (ii) No elephants are human beings. (iii) All flowers are beautiful things. 4. If 'Some students are philosophers' is TRUE, what can be inferred about the Truth or Falsity of the following (Any THREE) : (2x3=6) (a) Some students are non-philosophers. (b) All philosophers are non-students. (c) Some non-philosophers are students. (d) No philosophers are students. 5. Write short notes on Any THREE : (6x3=18) (a) Quantity, Quality in a Categorical Proposition. (b) Existential Import. (c) The Traditional Square of Opposition. (d) Distribution of Terms. (i) No weaklings are labor leaders, because no weaklings are true liberals, and all labor leaders are true liberals. (i) No criminals were pioneers, for all criminals are unsavory persons, and no pioneers were unsavery persons. (ili) All supporters of popular government are democrats, so all supporters of popular government are opponents of the Republican Party, inasmuch as all democrats are opponents of the Republican Party. 2. Translate the following sentences into Standard Form Categorical Propositions (Any SIX): (1x6=6) (a) Odd numbers are not even numbers. (b) Only gamblers are invited. (c) Many drivers are not license holders. (d) Soldiers are never dishonest. (e) Cats are not lions. (f) All flowers are not fragrant. (g) A few cars are hybrid. (h) Not even one candidate appeared for the interview. (i) Birds have wings. Since no leftists are capitalists and some wealthy stockbrokers are not leftists, so some capitalists are wealthy stockbrokers. 7. Test validity/invalidity of the following by syllogistic rules and fallacy method. (Do any Two)