A Level Computer Science Quiz

Which of the following is the binary representation of the decimal number 23?

• 10101

• 10111

• 11011

• 11101

What is the hexadecimal equivalent of the binary number 11010110?

• D6

• B6

• C7

• E6

Which of the following best describes a lossless compression technique?

• Data is permanently removed to reduce file size

• Data can be perfectly reconstructed from the compressed file

• Data is encrypted for security

• Data is converted to a different format

What is the time complexity of binary search in Big O notation?

Which sorting algorithm is generally considered the most efficient for large, unsorted datasets?

• Bubble Sort

• Insertion Sort

• Merge Sort

• Selection Sort

Which of the following is NOT a function of the operating system?

• Memory management

• Virus scanning

• File management

• Process scheduling

Which register in the CPU holds the address of the next instruction to be executed?

• Accumulator

• Program Counter

• Memory Address Register

• Instruction Register

Which of the following is a characteristic of RISC (Reduced Instruction Set Computer) architecture?

• Large number of complex instructions

• Simple instructions that execute in a single clock cycle

• Instructions of variable length

• High power consumption

Which protocol is used to transfer web pages over the Internet?

• FTP

• SMTP

• HTTP

• POP3

What is the main purpose of a subnet mask in networking?

• To encrypt data

• To identify the network and host portions of an IP address

• To assign MAC addresses

• To increase bandwidth