問75
頻出度★★☆
次の記憶媒体のうち, 記憶素子として半導体メモリを用いているものだけを全て挙げたものはどれか。 a CD-ROM b DVD-RAM c RAM d SSD e USB メモリ
令和7年度 ITパスポート試験 問75
テクノロジ系コンピュータ構成要素 › メモリ
This question's explanation and your answers so far.
解説
問 75
Incorrectア
This lists a, b, c, but a CD-ROM and b DVD-RAM are optical discs read and written with laser light, not semiconductor memory. Only c RAM here qualifies, while the semiconductor items d SSD and e USB flash drive are missing, so it is wrong.
Incorrectイ
This lists a, b, e, but a CD-ROM and b DVD-RAM are optical discs, not semiconductor memory. The semiconductor items c RAM and d SSD are missing, and non-qualifying optical discs are included as well, so it is wrong.
- ウ
正解 The correct answer is ウ (c, d, e). It lists exactly all and only the media that use semiconductor memory as their storage element. c RAM is semiconductor memory itself. d SSD is a secondary storage device that uses flash memory (a type of semiconductor memory) as its storage element. e USB flash drive likewise uses flash memory. On the other hand, a CD-ROM and b DVD-RAM are optical discs that physically read and write data on the recording surface with laser light, so they are not semiconductor memory. The only option that lists all three semiconductor-based items (c, d, e) and includes nothing else is ウ.
Incorrectエ
c and e (RAM and USB flash drive) are both semiconductor memory, which is correct. However, d SSD, which also uses semiconductor memory (flash memory), is missing, so it fails to meet the condition of listing all of the semiconductor-based items, and is therefore wrong.
ここがポイント
- Classify storage media by their storage element: the semiconductor-memory group is RAM and flash memory (SSD, USB flash drive); the optical-disc group is CD-ROM and DVD-RAM (read/written with laser light), which are not semiconductor.
- For “lists all and only the matching ones” type questions, check both for any missing qualifying items and any included non-qualifying items, and choose the option that is neither short nor excessive.
用語