UPSC 2023 › Science & Technology › Energy & Environment

2 questions · 2023 · answers as per the UPSC key

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UPSC 2023 · Q55 · Science & Technology › Energy & Environment · Save

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements :

  1. Biofilters provide waste treatment by removing uneaten fish feed.
  2. Biofilters convert ammonia present in fish waste to nitrate.
  3. Biofilters increase phosphorus as nutrient for fish in water.

How many of the statements given above are correct?

(a) Only one
(b) Only two
(c) All three
(d) None
Show answer
Answer: (b) Only two
UPSC 2023 · Q60 · Science & Technology › Energy & Environment · Save

With reference to green hydrogen, consider the following statements :

  1. It can be used directly as a fuel for internal combustion.
  2. It can be blended with natural gas and used as fuel for heat or power generation.
  3. It can be used in the hydrogen fuel cell to run vehicles.

How many of the above statements are correct?

(a) Only one
(b) Only two
(c) All three
(d) None
Show answer
Answer: (c) All three