A biscuit is a cookie. A British person would only call chocolate-chip biscuits a "cookie". Scones are a baked item made of firm dough. They are neither soft like bread or crisp like a cookie or a biscuit but are somewhere in between.
Correspondingly, what is a flat in British English?
Flat is used in British English, and apartment is used in North American English. The exact meaning of the word apartment depends on where you live.
Which English is used in India?
People who come to the USA from India rarely have difficulty in communicating with Americans, because most speak fluent English or have received their education in English. However, Indians speak British English, and there are many differences between British English and American English.
What is the British English word for truck?
Dictionaries of British/American English mostly cover well-known variants like truck/lorry and elevator/lift But these are just the tip of the iceberg. They told me today that British English for "pick-up truck" is "pick-up truck". I asked them "What about a lorry?" and they told me that a lorry is much bigger.