1. Ponzi scheme generates returns for older investors by acquiring new investors, who are promised a large profit at little to no risk.
2. It can maintain the illusion of a sustainable business as long as new investors contribute new funds.
3. Ponzi schemes rely on a constant flow of new investments to continue to provide returns to older investors. When this flow runs out, the scheme falls apart.

Which of the above statements are correct?

1. It is a digital or virtual currency that uses cryptography for security.
2. Cryptocurrencies use decentralized technology to let users make secure payments and store money without the need to use their name or go through a bank.
3. They run on a distributed public ledger called blockchain, which is a record of all transactions updated and held by currency holders.
4. Ethereum, first released as open-source software in 2009, is the first decentralized cryptocurrency.

Which of the above statements are correct?

1. It is an inter-governmental annual energy conference organized by the members of International Energy Agency (IEA).
2. The conference provides a platform for discussion on a range of energy-related topics.
3. Each year at CERAWeek, the Energy Innovation Pioneer program recognizes companies and entrepreneurs whose technologies and business plans have the potential to transform the energy industry's future.

Which of the above statements are correct? 

1. It is a medium-sized crane in Asia that breeds on the Tibetan Plateau and remote parts of India and Bhutan.
2. The species is protected under the Schedule I of Indian Wildlife (Protection) Act, 1972.
3. It is placed under ‘endangered’ category of IUCN Red List.
4. The bird is revered by the community of Monpas (major Buddhist ethnic group of Arunachal Pradesh) as an embodiment of the sixth Dalai Lama.

Which of the above statements are correct?

1. The core sector represents the capital base of the economy.
2. These eight industries have a combined share of above 40% in the Index of Industrial Production (IIP).
3. The eight core sector industries are coal, crude oil, natural gas, refinery products, fertilisers, steel, cement and electricity.

Which of the above statements are incorrect?