GCSE Computer Science 1 — Questions and Answers
Question 1: What is the binary representation of the decimal number 13?
- 1011
- 1101 (Correct answer)
- 1110
- 1001
Correct answer: 1101
13 in binary is 1101 because 8 + 4 + 0 + 1 = 13.
Question 2: Which of the following is an example of volatile memory?
- ROM
- Hard Drive
- RAM (Correct answer)
- SSD
Correct answer: RAM
RAM is volatile because it loses its contents when the power is turned off.
Question 3: What does ALU stand for in the context of a CPU?
- Automated Logic Unit
- Arithmetic Logic Unit (Correct answer)
- Array Loading Utility
- Advanced Language Unit
Correct answer: Arithmetic Logic Unit
ALU stands for Arithmetic Logic Unit, the component that performs mathematical and logical operations.
Question 4: How many bits are in one byte?
- 4
- 16
- 32
- 8 (Correct answer)
Correct answer: 8
One byte consists of exactly 8 bits, which is the standard unit of digital information.
Question 5: What is the hexadecimal equivalent of the decimal number 255?
- FE
- EF
- FF (Correct answer)
- 100
Correct answer: FF
FF in hexadecimal equals (15 × 16) + 15 = 240 + 15 = 255.
Question 6: Which storage medium typically has the fastest read/write access speed?
- DVD
- HDD
- Magnetic Tape
- SSD (Correct answer)
Correct answer: SSD
SSDs (Solid State Drives) use flash memory with no moving parts, giving them much faster access speeds than HDDs or optical media.
Question 7: What is the primary function of the Control Unit (CU) within a CPU?
- Performs arithmetic calculations
- Stores frequently used data
- Directs the operation of the processor by fetching, decoding, and executing instructions (Correct answer)
- Manages communication between the CPU and RAM
Correct answer: Directs the operation of the processor by fetching, decoding, and executing instructions
The Control Unit coordinates all CPU activities by fetching instructions from memory, decoding them, and directing execution.
GCSE Computer Science 1
What is the binary representation of the decimal number 13?