Q171. What is the base of the hexadecimal number system?
- 16
- 2
- 8
- 10
Show answer and explanation
Correct answer: A. 16
Hexadecimal uses digits 0-9 and A-F.
IT Jobs Computer Science MCQs with Answers
179 practice MCQs on Computer Science for IT Jobs tests. Think of your answer first, then open "Show answer and explanation". These are practice questions, not official examination papers.
Q172. How many KB are in 1 MB (binary)?
- 1024
- 100
- 1000
- 512
Show answer and explanation
Correct answer: A. 1024
1 MB = 1024 KB.
Q173. What is the standard keyboard layout called?
- ABCDEF
- DVORAK
- AZERTY
- QWERTY
Show answer and explanation
Correct answer: D. QWERTY
QWERTY is named after the first six letters.
Q174. Which language is used to design web pages?
- C++
- HTML
- Python
- Java
Show answer and explanation
Correct answer: B. HTML
HTML structures web pages.
Q175. What is the smallest unit of data in a computer?
- Word
- Bit
- Byte
- Nibble
Show answer and explanation
Correct answer: B. Bit
A bit is a binary digit, 0 or 1.
Q176. What is a record in a database?
- A row in a table
- A table
- A database
- A column
Show answer and explanation
Correct answer: A. A row in a table
A record is a row.
Q177. Which symbol is used in every email address?
- #
- &
- $
- @
Show answer and explanation
Correct answer: D. @
The @ separates user and domain.
Q178. Which SQL function counts rows?
- COUNT()
- TOTAL()
- SUM()
- NUMBER()
Show answer and explanation
Correct answer: A. COUNT()
COUNT returns the number of rows.
Q179. Who developed C++?
- Dennis Ritchie
- James Gosling
- Guido van Rossum
- Bjarne Stroustrup
Show answer and explanation
Correct answer: D. Bjarne Stroustrup
Stroustrup created C++.
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