9th class Computer Science and Entrepreneurship, Chapter 2: System Design and Troubleshooting MCQs

1. Which of the following Boolean expressions represents the OR operation?

1. (A) A · B
2. (B) A + B ✓
3. (C) A
4. (D) A ⊕ B

2. What is the dual of the Boolean expression A · 0 = 0?

1. (A) A + 1 = 1 ✓
2. (B) A + 0 = A
3. (C) A · 1 = A
4. (D) A · 0 = 0

3. Which logic gate outputs true only if both inputs are true?

1. (A) OR gate
2. (B) AND gate ✓
3. (C) XOR gate
4. (D) NOT gate

4. What is the decimal equivalent of the binary number 1101?

1. (A) 11
2. (B) 12
3. (C) 13 ✓
4. (D) 14

5. What is the first step in the systematic process of troubleshooting?

1. (A) Establish a Theory of Probable Cause
2. (B) Implement the Solution
3. (C) Identify Problem ✓
4. (D) Document Findings, Actions, and Outcomes

6. Why is effective troubleshooting important for maintaining systems?

1. (A) It helps save money on repairs
2. (B) It prevents the need for professional help
3. (C) It ensures systems operate smoothly and efficiently ✓
4. (D) It allows for more frequent system updates

7. Which step involves coming up with a theory about what might be causing a problem?

1. (A) Test the Theory to Determine the Cause
2. (B) Establish a Theory of Probable Cause ✓
3. (C) Implement the Solution
4. (D) Verify Full System Functionality

8. After implementing a solution, what is the next step in the troubleshooting process?

1. (A) Document Findings, Actions, and Outcomes
2. (B) Test the Theory to Determine the Cause
3. (C) Verify Full System Functionality ✓
4. (D) Establish a Plan of Action to Resolve the Problem

9. Why is troubleshooting important in computing systems?

1. (A) It ensures hardware components are always up to date
2. (B) It prevents the need for data backups
3. (C) It helps keep systems running smoothly and securely ✓
4. (D) It eliminates the need for software updates

10. The two binary digits used in digital systems are:

1. (A) 1 and 2
2. (B) 0 and 2
3. (C) 0 and 1 ✓
4. (D) 1 and 10

11. What kind of signal changes continuously over time?

1. (A) Static
2. (B) Analog ✓
3. (C) Digital
4. (D) Binary

12. Which of the following is an example of analog signal?

1. (A) Text message
2. (B) Binary code
3. (C) Human voice ✓
4. (D) Email

13. Which of the following signals has only two possible values?

1. (A) Analog
2. (B) Continuous
3. (C) Digital ✓
4. (D) Voice

14. What kind of signal is used in modern computing systems?

1. (A) Analog
2. (B) Digital ✓
3. (C) Wave
4. (D) Modulated

15. What does ADC stand for?

1. (A) Analog Dual Converter
2. (B) Audio Data Converter
3. (C) Analog to Digital Converter ✓
4. (D) Analog Data Compressor

16. In ADC, analog signals are converted to:

1. (A) Music
2. (B) Sound
3. (C) Digital signals ✓
4. (D) Graphs

17. Which device typically uses a DAC?

1. (A) Microphone
2. (B) Temperature sensor
3. (C) Speaker ✓
4. (D) Keyboard

18. Which device typically uses an ADC?

1. (A) Speaker
2. (B) Microphone ✓
3. (C) Monitor
4. (D) Printer

19. A binary digit is also known as a:

1. (A) Logic gate
2. (B) Voltage input
3. (C) Bit ✓
4. (D) Symbolic sign

20. ______ is a branch of mathematics related to logic and symbolic computation.

1. (A) Geometry
2. (B) Trigonometry
3. (C) Boolean algebra ✓
4. (D) Calculus