UGC NET Questions (Paper – 1)

Statements A, B and C give core rules for relative speed questions. A is correct because approaching objects in opposite directions effectively close the distance at the combined speed. B is true since when moving in the same direction, the faster gains on the slower at the difference of their speeds. C is also correct because when trains cross each other completely, the total length to be covered relative to one another is the sum of their lengths. D is false because inconsistent units for speed and distance must be converted before using formulas, and E is false since on a circular track the time of meeting depends on relative speed, which involves differences for same-direction motion. Thus, A, B and C only are correct.

Option A:
Option A is incomplete as it lists only A and B and omits C, thereby failing to mention the specific structure of train-crossing problems where lengths are added.

Option B:
Option B is also incomplete since it includes only A and C and omits B, so it does not explicitly state how same-direction relative speed is computed.

Option C:
Option C is incomplete as it contains only B and C and omits A, losing the rule for opposite-direction motion.

Option D:
Option D is correct because it collects all three true statements about relative speeds and excludes D and E, which misrepresent unit conversion requirements and the nature of circular-track meetings.