Reasoning
Logic and Fallacies
1,716 Questions
Understand the fundamentals of propositional logic, logical inference rules, and paradoxes. This set includes identifying logical fallacies, including those found in classical Nyaya logic. Strong grasp of these concepts is crucial for scoring well in the reasoning sections of competitive tests.
Propositional logic modelsLogical inference rulesTypes of logical fallaciesParadoxes and contingent truthsNyaya logic concepts
Logic and Fallacies Questions
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TRUE
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FALSE
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Can't Say
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Not possible
A
Correct answer
Explanation
Correlation and causation are fundamentally different concepts. Correlation indicates that two variables change together, but does not prove that one variable causes the other to change. A correlation could be coincidental, or both variables might be caused by a third hidden variable (confounding factor). This is why 'Correlation doesn't mean causation' is a TRUE statement.
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Prove
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Deduct
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Disagree
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Debate
B
Correct answer
Explanation
To abate means to diminish, reduce, or deduct something - such as abating a nuisance, abating rent, or abating a tax. 'Deduct' is the closest synonym among the options. Prove, disagree, and debate are unrelated to the meaning of abate. The word comes from Old French 'abatre' meaning 'to beat down'.
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Complimenting
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Casual Statement
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Multiple verbs
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Repetition of meaning
D
Correct answer
Explanation
Tautology refers to the repetition of the same meaning using different words - a redundancy in expression. Saying 'free gift' or 'ATM machine' are common examples. It's a rhetorical device or logical error where the conclusion is already contained in the premise.
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reasonable
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unbelievable
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problematic
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costly
A
Correct answer
Explanation
'Plausible' means reasonable, believable, or credible - something that could be true or likely. Options B (unbelievable) and C (problematic) are opposites or unrelated, while D (costly) refers to expense not believability. A plausible excuse is one that seems reasonable.
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INFINITE
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FINISH
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FINITE
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FORUM
A
Correct answer
Explanation
'Infinite' means without limits, bounds, or endless - perfectly matching the definition. The prefix IN- means 'not' and 'finite' means 'limited', so 'infinite' means 'not limited'. Options B (FINISH), C (FINITE), and D (FORUM) don't match the definition.
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By knowing the Cause we can conclude the Effect
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By knowing the Effect we can arrive at the Casue
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By knowing the Cause we cannot conclude the effect
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By knowing the Effect we can never arrive at the Casue
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None of these
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Both A, D
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uttering somthing
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The process of branching
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The reason behind something
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none
B
Correct answer
Explanation
Ramification refers to the process of branching or developing consequences. It describes how one action or decision can lead to multiple outcomes or effects, like branches spreading from a central point.
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truth
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direct
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fictitious
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example
C
Correct answer
Explanation
APOCRYPHAL means fictitious, of doubtful authenticity, or not genuine. It originally referred to texts not included in the official Bible canon. The correct answer is 'fictitious'. 'Truth' and 'direct' are opposites. 'Example' is unrelated to the meaning of doubtful authenticity.
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It's a superset of fuzzy logic
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It's a subset of fuzzy logic
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It's totally unrelated
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They are identical
B
Correct answer
Explanation
According to the extension principle in fuzzy logic, boolean logic is a special case or subset of fuzzy logic. When fuzzy membership values are restricted to only 0 and 1, fuzzy logic behaves exactly like boolean logic, making boolean logic a subset of the more general fuzzy logic framework.
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Boolean conditions
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Propositional logic
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Human decision making process
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The Turing Machine
C
Correct answer
Explanation
Fuzzy logic extends classical logic by allowing partial truth values between 0 and 1, making it ideal for modeling human reasoning which often deals with degrees of certainty rather than binary true/false. It was specifically developed to handle the vagueness and ambiguity inherent in human decision-making processes. Boolean conditions (A) and propositional logic (B) deal only with binary true/false values, while the Turing Machine (D) is a computational model unrelated to fuzzy reasoning.
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Theorems
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Assumptions
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Definitions
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Postulates
B
Correct answer
Explanation
In formal mathematical proofs, you must use established truths like theorems, definitions, and postulates. Assumptions (unless part of a temporary hypothesis for contradiction) cannot serve as the final justification for a step in a deductive proof.
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Reductio Ad Absurdum
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Quod Erat Demonstrandum
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Credo quia absurdum
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Argumentum Ad Absurdum
A
Correct answer
Explanation
Reductio Ad Absurdum is a form of argument that establishes a claim by showing that its opposite leads to an absurdity or contradiction. Q.E.D. is a notation used at the end of a proof, not a technique itself.
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Partial
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Propensity
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Prediction
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Proclaim
B
Correct answer
Explanation
Pravratti is a Sanskrit term referring to natural tendency or inclination. Propensity means a natural tendency to behave in a particular way. Prediction and Proclaim are unrelated; Partial is only loosely connected.
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Irrational
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Irregular
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Insistent
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Irrelevant
D
Correct answer
Explanation
Pertinent means relevant and applicable to the matter at hand. Irrelevant means not relevant or applicable - the direct opposite. Irrational relates to logic, irregular means not following a pattern, and insistent means demanding.
A
Correct answer
Explanation
INFER means to deduce or conclude from evidence and reasoning. When you say you didn't infer the solution but just guessed, you're correctly contrasting logical deduction from random guessing. The sentence uses infer properly.