The Indian Independence Bill received the royal Assent on ?

The answer is A) 18th July, 1947. The Indian Independence Bill, introduced in the House of Commons on 4 July 1947 after the Mountbatten Plan of 3 June, cleared both Houses of Parliament by 15 July. It received royal assent on 18 July 1947 and became the Indian Independence Act, 1947.

Why the others fail: 19, 20 and 21 July have no place in the legislative record of this Act. Those dates are close enough to tempt a guess, which is exactly why the question is set this way.

• Core concept: Royal assent is the final step that turns a bill into law. Do not confuse it with the date of introduction, passage in either House, or the appointed day.
• Appointed day: The Act took effect on 15 August 1947, which is when India and Pakistan became dominions. The Act also ended British paramountcy and gave the Constituent Assemblies power to frame constitutions.
• Mains angle: The Act is the legal bridge from the Cabinet Mission Plan to the Mountbatten Plan, and it explains how Partition was given statutory form.

Trap: Aspirants pick 15 August because it is the date of independence. Royal assent came three days earlier, on 18 July.