Craft and StructureEasyMain purpose of an explanation of a device
Craft and Structure practice question
A rain gauge is simply a straight-sided container with a scale. Because the sides are straight, the depth of water it collects equals the depth that fell on the ground. A gauge with a funnel on top collects more water for the same rainfall, so it must be read against a scale adjusted for the funnel's wider mouth.
What is the main purpose of the text?
- A. To explain how a rain gauge measures rainfall.Correct
- B. To argue that funnel-topped gauges are inaccurate.
- C. To describe the history of weather instruments.
- D. To compare rainfall in different regions.
Answer: A. To explain how a rain gauge measures rainfall.
The text explains the principle (straight sides) and its consequence for a funnel gauge. It's an explanation of how the device works.
Why the other answers are wrong
- B. To argue that funnel-topped gauges are inaccurate.
- The funnel gauge is described as needing an adjusted scale, not as inaccurate.
- C. To describe the history of weather instruments.
- No history is given.
- D. To compare rainfall in different regions.
- No regions or rainfall figures appear.
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