AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Modern currency is accepted as a medium of exchange because it is authorised by the government. In India, the law makes it legal tender that cannot be refused in settling transactions.
Source: Money and Credit, Chapter 3 — Currency
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The examiner expects one clear reason: government authorization / legal tender status. Mention RBI issuing notes on behalf of the central government and the law making rupee legally acceptable if you have space, but the core point is "government authority." Avoid long explanations about barter or history — this is a 1-mark answer.