سوال ۲ کنکور ارشد مهندسی مکانیک ۱۴۰۴
PART A: Vocabulary — Choose the word or phrase (1), (2), (3), or (4) that best completes the sentence.
The weakened ozone «..........», which is vital to protecting life on Earth, is on track to be restored to full strength within decades.
پاسخ صحیح: گزینهٔ A — layer
This is a fixed collocation: the region of the stratosphere that absorbs ultraviolet radiation is the ozone layer — a layer is a sheet or stratum of one material lying over another, which is exactly what the sentence describes (which is vital to protecting life on Earth ... restored to full strength).
| Option | Meaning | Why it fails |
|---|---|---|
| 1) layer | a stratum/sheet of material | ✅ ozone layer is the standard term |
| 2) level | a height, amount, or degree | ozone level means a concentration figure, not a protective shield that can be "restored to full strength" as a thing |
| 3) brim | the rim/edge of a hat or cup | unrelated to atmospheric science |
| 4) ingredient | a component of a mixture or recipe | ozone is not an "ingredient" that shields Earth |
Exam trick: Vocabulary items in the konkur often test a fixed noun collocation rather than a subtle nuance. Scan for a well-known two-word term (ozone layer, greenhouse effect, global warming) before weighing shades of meaning.