問96
頻出度★★☆
CPU のクロック周波数や通信速度などを表すときに用いられる国際単位系 (SI) 接頭語に関する記述のうち, 適切なものはどれか。
令和5年度 ITパスポート試験 問96
テクノロジ系基礎理論 › 情報に関する理論
This question's explanation and your answers so far.
解説
問 96
Incorrectア
G multiplied by 10 to the 6th power is 10 to the 9th power × 10 to the 6th power = 10 to the 15th power, which is not T (10 to the 12th power). Going from G to the next prefix T only requires multiplying by 10 to the 3rd power (1000 times), so “10 to the 6th power” is wrong.
- イ
正解 Among the International System of Units (SI) prefixes, M (mega) represents 10 to the 6th power, G (giga) 10 to the 9th power, and T (tera) 10 to the 12th power; each adjacent prefix is larger by 10 to the 3rd power (1000 times). Choice イ states that M multiplied by 10 to the 3rd power equals G, and since 10 to the 6th power × 10 to the 3rd power = 10 to the 9th power = G, it matches. Therefore, イ is correct.
Incorrectウ
M multiplied by 10 to the 6th power is 10 to the 6th power × 10 to the 6th power = 10 to the 12th power, which corresponds to T (tera), not G (10 to the 9th power). From M to G is 10 to the 3rd power, so “10 to the 6th power” is wrong.
Incorrectエ
T multiplied by 10 to the 3rd power is 10 to the 12th power × 10 to the 3rd power = 10 to the 15th power, which is larger than G. Moreover, T is already larger than G, so increasing T can never yield G; it is wrong in terms of magnitude as well.
ここがポイント
- The SI prefixes M (10 to the 6th power) → G (10 to the 9th power) → T (10 to the 12th power) each grow by 10 to the 3rd power (1000 times) from one to the next.
- For questions asking about ratios, write out each prefix as a power of 10 and compare the difference in exponents; this makes the answer reliable.
用語