NCCE Student Knowledge Questions - computer systems 1

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Question 1: Identify this logic gate

• A – OR
• B – NOT
• C – AND
• D – XOR

Question 2: Which logic gate has the following truth table?

• A – NOT
• B – XOR
• C – OR
• D – AND

Question 3: What is the Boolean expression for this truth table?

• A: Z = A AND B
• B: Z = A AND NOT B
• C: Z = A OR B
• D: Z = A XOR B

Question 4: What is the Boolean expression for the following logic circuit?

• A: Y = A OR B AND NOT C
• B: Y = A AND B OR NOT C
• C: Y = NOT C OR A OR B
• D: Y = C OR NOT A AND B

Question 5: Which function of an Operating System rearranges the contents of a disk so files are stored together?

• A: Disk Cleaning
• B: Disk Defragmentation
• C: Disk Compression
• D: Disk Formatting

Question 6: Which truth table is correct for A NOT A?

• A:
• B:
• C:
• D:

Question 7: The hexadecimal number system uses the digits 0 to 9 and letters A-F. What number base does hexadecimal use?

• A: Base 10
• B: Base 2
• C: Base 16
• D: Base 32

Question 8: The central processing unit carries out three main functions. What are they?

• A: Find, deduce and execute instructions
• B: Fetch, decode and execute instructions
• C: Fetch, deduce and execute instructions
• D: Find, decode and run instructions