It is the international currency in which the highest faith is shown and is needed by every economy. The strongest currency of the world is one which has a high level of liquidity, i.e. people are easily willing to sell or buy it due to the high confidence shown in it.

2 and 3 are incorrect.

Fiat money is currency that a government has declared to be legal tender, but it is not backed by a physical commodity. The value of fiat money is derived from the relationship between supply and demand rather than the value of the material from which the money is made. Because fiat money is not linked to physical reserves, it risks becoming worthless due to hyperinflation.

The most important scale of asset quality is Non Performing Assets (NPA). But NPA alone doesn’t tell the whole story of bad asset quality of loans given by banks. Hence a new classification is made in the form of stressed assets that comprises restructured loans and written off assets besides NPAs.
Restructured asset or loan are that assets which got an extended repayment period, reduced interest rate, converting a part of the loan into equity, providing additional financing, or some combination of these measures.
Written off assets are those the bank or lender doesn’t count the money borrower owes to it. The financial statement of the bank will indicate that the written off loans are compensated through some other way.

Many economists are struggling to classify the Indian economic slowdown. Should it be called “cyclical” or “structural”? Typically, a cyclical slowdown is caused by an excess of investment demand—over-investment in capital assets (residential and non-residential) and in inventory. The production of final goods generated by excess investment is not absorbed, leading to inventory reduction, lower prices, lower economic activity, and some loss in employment. When this is accompanied by excess debt, the cyclical slowdown can be prolonged or it may become structural.
A structural slowdown, on the other hand, is a more deep-rooted phenomenon that occurs due to a one-off shift from an existing paradigm. The changes, which last over a long-term, are driven by disruptive technologies, changing demographics, and/or change in consumer behaviour.

All of the above are correct.

The Bank for International Settlements (BIS) is an international financial institution owned by central banks which “fosters international monetary and financial cooperation and serves as a bank for central banks”.
It also provides banking services, but only to central banks and other international organizations. It is based in Basel, Switzerland, with representative offices in Hong Kong and Mexico City.
The BIS hosts the Secretariat of the Basel Committee on Banking Supervision and with it has played a central role in establishing the Basel Capital Accords of 1988, Basel II framework in 2004 and more recently Basel III framework.
Sixty-two central banks and monetary authorities are currently members of the BIS and have rights of voting and representation at general meetings. Reserve Bank of India is the member of BIS.