Question 1: Convert the binary number 1011 into its decimal (denary) equivalent.

Answer: The decimal equivalent of 1011 is 11.

Question 2: Write the binary representation of the decimal number 25.

Answer: The binary representation of 25 is 11001.

Question 3: Explain in your own words what binary numbers are used for in computers.

Answer: Binary numbers are used in computers because they can be easily represented with two states (on/off or 1/0), which matches how digital circuits work.

Question 4: Describe a simple scenario where a logic AND gate is used in a real-world device.

Answer: A common example is a security system where two sensors must both be activated (both inputs are 1) to trigger an alarm.

Question 5: Complete the truth table for a logic AND gate with inputs A and B and output C.

Answer: A | B | C 0 | 0 | 0 0 | 1 | 0 1 | 0 | 0 1 | 1 | 1

Question 6: Complete the truth table for a logic OR gate with inputs A and B and output C.

Answer: A | B | C 0 | 0 | 0 0 | 1 | 1 1 | 0 | 1 1 | 1 | 1

Question 7: Draw a logic circuit for an AND gate. Label the inputs and output.

Answer: A correct sketch would show a standard AND gate shape with two input lines entering the gate and one output line leaving it, with labels for A, B, and C.

Question 8: Sketch a truth table for a NOT gate with input A and output B. Include all possible values.

Answer: A | B 0 | 1 1 | 0

Question 9: A binary number is 1101. What is its value in decimal?

Answer: The decimal value of 1101 is 13.

Question 10: A device uses binary code to store data. If the binary code is 10010, what is its value in decimal?

Answer: The decimal value of 10010 is 18.

Question 11: Describe how a logic gate can be used to control a traffic light system.

Answer: A logic gate can be used to turn the traffic light on or off based on inputs from sensors or timers, such as using an AND gate to ensure that cars only go when both the timer and sensor signals are active.

Question 12: Sketch a simple flowchart showing how binary data might be processed in a computer from input to output.

Answer: A correct sketch would include: Input device → Data conversion to binary → Processing unit → Output device, with arrows showing data flow and labels.