UGC NET Questions (Paper – 1)

A and B define AP and GP. D is true because the sign of the common difference determines whether an AP increases, decreases, or stays constant. E is true because multiplying by −1 flips a non-zero term’s sign each step, alternating between a and −a. C is false (Fibonacci-type recurrence is generally neither AP nor GP). Hence A, B, D and E only are correct.

Option A:
Option A is incomplete as it omits E, a standard GP special case often tested.

Option B:
Option B is correct because it combines the core definitions with typical behaviour of APs and a specific GP example, and excludes C, which is false.

Option C:
Option C is wrong because it omits A, the definition of an arithmetic sequence.

Option D:
Option D is incorrect because it omits B, the definition of a geometric sequence.