With reference to 'Bitcoins', sometimes seen in the news, which of the following statements is/are correct?

1. Bitcoins are tracked by the Central Banks of the countries.
2. Anyone with a Bitcoin address can send and receive Bitcoins from anyone else with a Bitcoin address.
3. Online payments can be sent without either side knowing the identity of the other.
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Which of the following have species that can establish a symbiotic relationship with other organisms?

1. Cnidarians
2. Fungi
3. Protozoa
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Which of the following statements is/are correct regarding the 'Monetary Policy Committee (MPC)'?

1. It decides the RBI's benchmark interest rates.
2. It is a 12-member body including the Governor of RBI and is reconstituted every year.
3. It functions under the chairmanship of the Union Finance Minister.
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Which of the following is/are tributary/tributaries of Brahmaputra?

1. Dibang
2. Kameng
3. Lohit
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Which of the following pairs is/are correctly matched?

1. Cassini-Huygens - Orbiting Venus and transmitting data to Earth
2. Messenger - Mapping and investigating Mercury
3. Voyager 1 and 2 - Exploring the outer solar system
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