問81
頻出度★☆☆
ソフトウェア①～④ のうち, スマートフォンやタブレットなどの携帯端末に使用される OSS (Open Source Software) の OS だけを全て挙げたものはどれか。 ① Android ② iOS ③ Thunderbird ④ Windows Phone
平成30年度 秋期 ITパスポート試験 問81
テクノロジ系ソフトウェア › オペレーティングシステム
This question's explanation and your answers so far.
解説
問 81
- ア
正解 The question asks for the option that lists exactly and only the software that satisfies both conditions: being an OS used on mobile devices such as smartphones and tablets, and being OSS (Open Source Software). ① Android is an OS for mobile devices developed based on Linux, and its source code is publicly available, so it is OSS. Only ① satisfies both conditions, so ア, which lists ①, is the correct answer.
Incorrectイ
This option lists ①, ②, ③, but ② iOS is Apple's own closed-source, proprietary software and is not OSS, and ③ Thunderbird, although it is OSS, is not an OS but email software. Because it includes items that do not satisfy the conditions, it is wrong.
Incorrectウ
This option lists ②, ④; although both ② iOS and ④ Windows Phone are OSs for mobile devices, both are companies' proprietary software and are not OSS. Since it contains none of the items that satisfy the conditions, it is wrong.
Incorrectエ
This option lists ③, ④, but ③ Thunderbird is not an OS but email software, and ④ Windows Phone is a closed-source OS that is not OSS. Since neither satisfies the conditions, it is wrong.
ここがポイント
- OSS (Open Source Software) is software whose source code is publicly available and which anyone can use, modify, and redistribute. Among mobile-device OSs, Android is the representative example, while iOS and Windows Phone are proprietary (closed-source) OSs.
- This question is judged by the AND of two conditions: being an OS for mobile devices and being OSS. Note that Thunderbird is OSS but not an OS (a difference in the category of the term).
用語