비행기는 레이더를 이용하여 다른 항공기나 장애물을 ( ).
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정답: A. 감지합니다
How to solve: The sentence describes the function of radar in an airplane. Radar is used to detect other aircraft or obstacles. '감지하다' (to detect) is the most appropriate verb that fits this context.
Choice analysis (EN):
A — '감지합니다' (detects) is correct. Radar's primary function is to detect objects.
B — '발명합니다' (invents) is irrelevant to the function of radar.
C — '변화합니다' (changes) does not fit the context of what radar does to objects.
D — '계산합니다' (calculates) is not the direct action radar performs on obstacles; detection comes first.
경찰은 레이더 장비로 자동차의 ( )를 측정했습니다.
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정답: B. 속도
How to solve: This question tests knowledge of what radar typically measures in a police context. Police radar is commonly used to measure vehicle speed.
Choice analysis (EN):
A — '무게' (weight) is not measured by police radar.
B — '속도' (speed) is correct. Speed guns used by police employ radar technology to measure vehicle speed.
C — '색깔' (color) is not measured by radar.
D — '모양' (shape) is not typically measured by police radar for enforcement purposes.
( ) 레이더는 비나 눈과 같은 기상 현상을 관측하는 데 사용됩니다.
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정답: C. 날씨
How to solve: The sentence describes a type of radar used to observe weather phenomena like rain or snow. '날씨' (weather) is the direct descriptor for such radar.
Choice analysis (EN):
A — '음악' (music) is unrelated to radar observing weather.
B — '요리' (cooking) is unrelated to radar observing weather.
C — '날씨' (weather) is correct. Weather radar is specifically designed to observe meteorological conditions.
D — '시간' (time) is unrelated to the type of radar described.
레이더는 ( )를 이용하여 물체의 위치를 파악합니다.
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정답: C. 전파
How to solve: This question asks about the basic principle of radar. Radar operates by sending out and receiving radio waves.
Choice analysis (EN):
A — '소리' (sound) is used by sonar, not radar.
B — '빛' (light) is used by lidar or optical systems, but radar specifically uses electromagnetic waves in the radio frequency range.
C — '전파' (radio waves) is correct. This is the fundamental principle of radar (Radio Detection And Ranging).
D — '열' (heat) is used by thermal imaging, not radar.
항구의 레이더는 바다에 있는 ( )들의 움직임을 모니터링합니다.
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정답: D. 선박
How to solve: The sentence talks about radar at a port (항구) monitoring movements in the sea (바다). Ships are the most appropriate objects to be monitored by radar in this context.
Choice analysis (EN):
A — '자동차' (cars) are on land, not typically monitored by port radar in the sea.
B — '비행기' (airplanes) are in the air, not typically monitored by port radar in the sea.
C — '건물' (buildings) are stationary and on land.
D — '선박' (ships) is correct. Ports use radar to monitor the movement of ships in their surrounding waters.
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