2025 · Paper 1

Complete GATE ES 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 28–30 of 65. Imported answers require review unless explicitly marked reviewed.

Question 28

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Choose the correct option(s) from the following in the plastic waste management

Your answerSelect all correct options. You can choose more than one.

A.

Plastic wastes may be burnt to generate fuel oil and fuel gas.

B.

Plastic wastes along with bitumen may be used for road/pavement construction.

C.

Polyethylene terephthalate (PET) and high density polyethylene (HDPE) are the most common plastics for recycling.

D.

Plastics made of branched monomers can be easily recycled.

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Question 29

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Choose the option(s) giving the correct process flow-sheet for producing refuse derived fuel (RDF) from the segregated waste collected in the dry waste containers (blue coloured containers of the municipal solid waste (MSW) collection scheme).

Your answerSelect all correct options. You can choose more than one.

A.



B.



C.



D.



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Question 30

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Choose the correct option(s) from the following regarding the symbiotic relationships

Your answerSelect all correct options. You can choose more than one.

A.

Lichens are a symbiotic association of fungi and bacteria. They can survive in extreme conditions of air pollution.

B.

Lichens are a symbiotic association of fungi and bacteria. The fungi can absorb water and minerals from atmosphere, and bacteria can generate foods.

C.

Lichens are a symbiotic association of fungi and algae. They can survive in extreme conditions, but are very sensitive to air pollution.

D.

Lichens are a symbiotic association of fungi and algae. The fungi can absorb water and minerals from atmosphere, and algae can generate food through photosynthesis.

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