GCSE GCSE Computer Science 1 — Questions and Answers
Question 1: What is the decimal value of the binary number 1010?
- 8
- 10 (Correct answer)
- 12
- 14
Correct answer: 10
1010 in binary equals 1×8 + 0×4 + 1×2 + 0×1 = 10 in decimal.
Question 2: How many bits are in one byte?
- 4
- 16
- 32
- 8 (Correct answer)
Correct answer: 8
A byte consists of 8 bits, which is the standard unit of digital information storage.
Question 3: What does ASCII stand for?
- American Standard Code for Information Interchange (Correct answer)
- Advanced System Code for International Information
- Automatic Standard Character Interchange Interface
- Applied System Code for Information Input
Correct answer: American Standard Code for Information Interchange
ASCII stands for American Standard Code for Information Interchange, a character encoding standard used to represent text in computers.
Question 4: Which number system uses base 16?
- Binary
- Octal
- Hexadecimal (Correct answer)
- Decimal
Correct answer: Hexadecimal
Hexadecimal uses base 16, with digits 0–9 and letters A–F representing values 0 to 15.
Question 5: What is the result of the binary addition 1011 + 0101?
- 1100
- 10000 (Correct answer)
- 1111
- 10001
Correct answer: 10000
1011 (decimal 11) + 0101 (decimal 5) = 16, which in binary is 10000.
Question 6: What is the purpose of a check digit?
- To speed up data transmission
- To detect errors in data entry or transmission (Correct answer)
- To encrypt sensitive data
- To compress file sizes
Correct answer: To detect errors in data entry or transmission
A check digit is appended to data to detect errors caused by mistyping or corruption during transmission.
Question 7: What does the term 'pixel' stand for?
- Picture element (Correct answer)
- Pixelated excellence
- Photo index link
- Projected image cell
Correct answer: Picture element
Pixel is a portmanteau of 'picture element', the smallest addressable unit in a digital image.
GCSE GCSE Computer Science 1
What is the decimal value of the binary number 1010?