Craft and StructureEasyMain purpose of an explanation of an instrument
Craft and Structure practice question
A barometer measures the pressure of the air. Because pressure usually falls before rain and rises before fair weather, a barometer that has been dropping steadily is a fair warning to bring the washing in.
What is the main purpose of the text?
- A. To explain what a barometer measures and how its readings are used.Correct
- B. To argue that barometers are unreliable.
- C. To describe how rain forms in clouds.
- D. To compare barometers with thermometers.
Answer: A. To explain what a barometer measures and how its readings are used.
The text says what the instrument measures and what a falling reading tells you. It explains its use.
Why the other answers are wrong
- B. To argue that barometers are unreliable.
- The text treats a falling barometer as a 'fair warning', not as unreliable.
- C. To describe how rain forms in clouds.
- Rain formation isn't described.
- D. To compare barometers with thermometers.
- Thermometers aren't mentioned.
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