SarkariPYQ

SSC GD 2023 PYQ — Question 20

SSC GD Constable (English) - 10 Jan 2023 - Shift 2 • English • Q20

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In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

A natural gas barrier in the upper atmosphere called the ozone layer (1.) _________ people and other living things from the sun's harmful ultraviolet (UV) radiation. Ozone exists in tiny concentrations (2.) _________ the atmosphere, but the majority (about 90%) is found in the stratosphere, a layer that is 10 to 50 kilometres (3.) _________ the surface of Earth. The ozone layer is essential to life on Earth because it (4.) ________ out the majority of the sun's harmful UV rays. In the 1970s, researchers (5.) __________ that the ozone layer was thinning.

Select the most appropriate option to fill in blank number 5.

Show answer & explanation

Correct answer: C

Explanation

The correct answer is option 3 i.e. learnt.

The passage talks about the barrier "Ozone layer". The sentence talks about research done in the 1970s.

'Learnt' is the correct past tense form of the verb "learn."

So, the appropriate word for the filler is 'learnt'.