Quick Answer

Logical Reasoning (Unit 6 of UGC NET Paper 1) covers structure and kinds of arguments, deductive and inductive reasoning, analogies, Venn diagrams, and Indian Logic concepts — Pramanas, Anumana, Vyapti, and Hetvabhasa.

UGC NET Paper 1 Unit 6: Logical Reasoning — Notes

This unit is considered challenging because it blends Western logic — deductive and inductive reasoning, syllogisms, Venn diagrams — with Indian Logic, a distinct philosophical tradition. Once the terminology is clear, however, most questions become straightforward pattern recognition.

Deductive vs. Inductive Reasoning

Deductive reasoning moves from general premises to a specific, logically certain conclusion (e.g., “All men are mortal; Socrates is a man; therefore Socrates is mortal”). Inductive reasoning moves the other way — from specific observations to a broader, probable generalisation, without absolute certainty.

Venn Diagrams and Syllogisms

Syllogism questions can often be solved faster by drawing a Venn diagram: if “all A are B” and “all B are C,” drawing circle A entirely inside circle B, and B entirely inside C, immediately shows that “all A are C” is validly true — no memorisation of formal rules required.

Indian Logic: The Four Pramanas

Indian Logic identifies four valid sources of knowledge (Pramanas):

Pratyaksha — direct sense perception.
Anumana — inference (e.g., inferring fire from seeing smoke).
Upamana — knowledge through comparison or analogy.
Shabda — verbal testimony from a reliable source.

Vyapti and Hetvabhasa

Vyapti is the invariable relationship between the Hetu (reason/sign) and the Sadhya (thing to be proved) — the logical foundation that makes a valid Anumana possible. Hetvabhasa refers to fallacies in this reasoning, such as Savyabhichara (an inconclusive reason found in both presence and absence of the conclusion) and Asiddha (a reason that doesn’t actually exist in the subject under discussion).