GATE ES 2024 Paper 1 — page 6

Questions 16–18 of 65. Imported answers require review unless explicitly marked reviewed.

Which one of the following conversions belongs to nonsymbiotic nitrogen fixation?

Your answerChoose one option.

Atmospheric nitrogen to ammonia by Rhizobium bacteria in nodules attached to roots of legumes

Atmospheric nitrogen to ammonia by Azotobacter species

Nitrate to gaseous nitrogen under anaerobic conditions

Nitrate to ammonia under aerobic conditions

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Crown corrosion of reinforced cement concrete sewer is caused by ________.

Your answerChoose one option.

sulfur oxidising bacteria

iron oxidizing bacteria

denitrifying bacteria

fermentative bacteria

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The process of removal of particles in a rapid sand filter with their description is given in the table.

Process	Description
(i) Straining	P: Removes only particles in the water large enough to get caught in the pores of the filter
(ii) Sedimentation	Q: Larger and heavier particles do not follow the fluid streamline around the sand grain and settle on the grain
(iii) Interception	R: Particles that do follow the streamline, but are too large and are caught because they brush up against the sand grains
(iv) Diffusion	S: Very small particles are experiencing Brownian motion and may collide with the sand grains by chance

Select the correct match.

Your answerChoose one option.

i-S; ii-P; iii-Q; iv-R

i-Q; ii-R; iii-S; iv-P

i-R; ii-S; iii-P; iv-Q

i-P; ii-Q; iii-R; iv-S

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2024 · Paper 1