Ratio and proportion basics – UGC NET Question

Statements A, B, C and E correctly describe fundamental ideas of ratio and proportion. Ratios compare quantities by division, proportions equate two ratios and ad = bc is the standard cross-multiplication rule. It is also true that meaningful ratios compare quantities in the same units. Statement D is false because there is no requirement that a + c equals b + d in a valid proportion. Hence the combination including A, B, C and E but excluding D is the only fully correct set.

Option A:
Option A is correct because it includes all true statements and excludes D, which imposes a wrong condition on proportions. It provides a complete and accurate summary of the key properties tested in NET-level questions on ratio and proportion.

Option B:
Option B is incomplete since it omits E and therefore ignores the practical requirement about same units, which is important for interpreting real-life ratio problems. This omission makes the set of statements only partially correct.

Option C:
Option C is wrong because it includes D, the incorrect condition about sums of antecedents and consequents, even though it also contains some true statements. The presence of D makes the overall combination incorrect.

Option D:
Option D is wrong because it omits A (the basic definition of ratio) and also includes E while missing other true statements; it does not match the complete set of correct statements.