11. Two statements are said to materially equivalent if
12. Which one of the following is correct symbolisation of 'p if and only if q'?
13. Match the following:
List-I
List-II
a. Inclusive sense
1. Weak
b. Exclusive sense
2. Strong
c. Disjunction
3. ∨
d. Negation
4. Not
| List-I | List-II |
| a. Inclusive sense | 1. Weak |
| b. Exclusive sense | 2. Strong |
| c. Disjunction | 3. ∨ |
| d. Negation | 4. Not |
14. Fallacy is an error in . . . . . . . . and mistake in . . . . . . . .
1. Reasoning
2. Method
3. Judgement
4. Form
1. Reasoning
2. Method
3. Judgement
4. Form
15. "From any true substitution instance of a propositional function, we may validly infer the existential quantification of that propositional function." Identify the rule.
16. Given below are Assertion (A) and Reason (R), consider them and select the correct answer:
Assertion (A) A categorical syllogism commits a fallacy of four terms if more than three terms are used.
Reason (R) In a standard form of categorical syllogism, there are three and only three terms occuring twice each in the same meaning.
Assertion (A) A categorical syllogism commits a fallacy of four terms if more than three terms are used.
Reason (R) In a standard form of categorical syllogism, there are three and only three terms occuring twice each in the same meaning.
17. Symbolic logic is the method of representing . . . . . . . . expressions.
18. In quantification 'x' is an . . . . . . . . which is to be replaced by . . . . . . . say 'a'.
19. Which one among the following is a tautology?
20. Consider the following argument (a) and argument form (b) and answer by marking the correct answer:
1. (A ⊃ B) . (C ⊃ D) ∴ A ⊃ B
2. (p ⊃ q) . (r ⊃ s) ∴ p ⊃ q
1. (A ⊃ B) . (C ⊃ D) ∴ A ⊃ B
2. (p ⊃ q) . (r ⊃ s) ∴ p ⊃ q
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