Reading: Fill in the Blanks (Dropdown) · Part 2: Reading

The speed of sound (otherwise known as Mach 1) varies…

7 students marked "I sat this"Added 1 Dec 2022Question #120428
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Choose the word for each blank.

The speed of sound (otherwise known as Mach 1) varies with temperature. At sea level on a 'standard day', the temperature is 59°F, and Mach 1 is approximately 761 mph. As the altitude increases, the temperature and speed of sound 1 decrease until about 36,000 feet, after which the temperature remains steady until about 60,000 feet. Within that 36,000 – 60,000 foot range, Mach 1 is about 661 mph. Because of the 2 , it is possible for an airplane flying supersonic at high altitude to be slower than a subsonic flight at sea level. The transonic band (the 'sound barrier‘) extends 3 around Mach 0.8 — when the first supersonic shock waves 4 the wing — to Mach 1.2, when the entire wing has gone supersonic .

Options for each gap (alphabetical)

  • 1 both · none · not · yet
  • 2 variation · variety · ventilation · vibration
  • 3 above · beyond · from · towards
  • 4 add to · diverge from · from on · prevent from
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Reading: Fill in the Blanks (Dropdown) format (Pearson)

Formerly called Reading & Writing: Fill in the Blanks.

PromptText up to 200 words
Time to answerNot set per question (Part 2 lasts 23–30 minutes)
Skills assessedReading

How it is scored

  • Partial credit applies: a partly correct response still scores.

Source: Pearson, PTE Academic & UKVI test format, Part 2: Reading, checked 9 October 2026.