“Membrane Bioreactors” are often discussed in the context of:

Consider the following materials:

1. Agricultural residues

2. Corn grain

3. Wastewater treatment sludge

4. Wood mill waste

Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?

Which one of the following words/phrases is most appropriately used to denote “an interoperable network of 3D virtual worlds that can be accessed simultaneously by millions of users, who can exert property rights over virtual items” ?

Which of the following is/are correctly matched in terms of equivalent rank in the three services of Indian Defence forces?

Select the correct answer using the code given below :