COMPUTER NETWORK

1. What is the purpose of modulation in the physical layer?

a) To convert digital signals to analog signals b) To convert analog signals to digital signals c) To transmit signals over long distances d) To multiplex multiple signals

2. Which of the following is a digital-to-digital conversion technique?

a) Amplitude Modulation (AM) b) Frequency Modulation (FM) c) Non-Return-to-Zero (NRZ) d) Pulse Code Modulation (PCM)

3. What is the primary purpose of analog-to-digital conversion?

a) To convert continuous signals to discrete signals b) To convert discrete signals to continuous signals c) To transmit signals over long distances d) To multiplex multiple signals

4. Which of the following is an example of analog-to-analog conversion?

a) Amplitude Modulation (AM) b) Pulse Code Modulation (PCM) c) Non-Return-to-Zero (NRZ) d) Frequency Shift Keying (FSK)

5. What is the purpose of digital-to-analog conversion?

a) To convert digital signals to analog signals b) To convert analog signals to digital signals c) To transmit signals over long distances d) To multiplex multiple signals

6. Which of the following is a multiplexing technique?

a) Time Division Multiplexing (TDM) b) Frequency Division Multiplexing (FDM) c) Wavelength Division Multiplexing (WDM) d) All of the above

7. What is the primary purpose of multiplexing?

a) To combine multiple signals into one b) To separate multiple signals c) To convert digital signals to analog signals d) To convert analog signals to digital signals

8. Which of the following is a digital modulation technique?

a) Amplitude Shift Keying (ASK) b) Frequency Shift Keying (FSK) c) Phase Shift Keying (PSK) d) All of the above

9. What is the primary purpose of Pulse Code Modulation (PCM)?

a) To convert analog signals to digital signals b) To convert digital signals to analog signals c) To transmit signals over long distances d) To multiplex multiple signals

10. Which of the following is an example of digital-to-analog conversion?

a) Amplitude Shift Keying (ASK) b) Frequency Shift Keying (FSK) c) Phase Shift Keying (PSK) d) All of the above

11. What is the primary purpose of Time Division Multiplexing (TDM)?

a) To divide the transmission time into slots b) To divide the frequency spectrum into bands c) To convert analog signals to digital signals d) To convert digital signals to analog signals

12. Which of the following is an example of analog-to-digital conversion?

a) Pulse Code Modulation (PCM) b) Delta Modulation c) Adaptive Delta Modulation d) All of the above

13. What is the primary purpose of Frequency Division Multiplexing (FDM)?

a) To divide the frequency spectrum into bands b) To divide the transmission time into slots c) To convert analog signals to digital signals d) To convert digital signals to analog signals

14. Which of the following is a characteristic of digital signals?

a) Discrete values b) Continuous values c) Infinite range d) Analog representation

15. What is the primary purpose of Wavelength Division Multiplexing (WDM)?

a) To combine multiple optical signals b) To separate multiple optical signals c) To convert analog signals to digital signals d) To convert digital signals to analog signals

Physical Layer MCQs

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