COMPUTER NETWORK

1. What is the primary function of the physical layer in the OSI model?

a) Transmitting raw bits over a communication channel b) Ensuring error-free data transmission c) Managing network addressing d) Encrypting data for security

2. What is the difference between analog and digital signals?

a) Analog signals are continuous, while digital signals are discrete b) Digital signals are continuous, while analog signals are discrete c) Analog signals are used only in computers d) Digital signals are used only in telephones

3. Which of the following is an example of a transmission medium?

a) Fiber optic cable b) Router c) Switch d) Hub

4. What is attenuation in data communication?

a) Loss of signal strength over distance b) Increase in signal strength over distance c) Distortion of the signal d) Delay in signal propagation

5. What is the primary cause of transmission impairments?

a) Noise b) Bandwidth c) Latency d) Protocol errors

6. What is the Nyquist theorem used for?

a) Determining the maximum data rate of a noiseless channel b) Calculating the bandwidth of a signal c) Measuring signal attenuation d) Detecting transmission errors

7. What is the Shannon capacity formula used for?

a) Determining the maximum data rate of a noisy channel b) Calculating the bandwidth of a signal c) Measuring signal attenuation d) Detecting transmission errors

8. What is the primary advantage of digital signals over analog signals?

a) Better noise immunity b) Higher bandwidth c) Lower cost d) Easier to implement

9. What is the purpose of modulation in data communication?

a) To convert digital signals to analog signals b) To increase the bandwidth of a signal c) To reduce signal attenuation d) To improve signal-to-noise ratio

10. What is the primary cause of signal distortion?

a) Dispersion b) Noise c) Attenuation d) Latency

11. What is the primary purpose of error detection in data communication?

a) To ensure data integrity b) To increase data rate c) To reduce bandwidth usage d) To improve signal strength

12. What is the primary cause of jitter in data communication?

a) Variations in signal delay b) Signal attenuation c) Noise d) Dispersion

13. What is the primary purpose of multiplexing in data communication?

a) To combine multiple signals into one b) To increase signal strength c) To reduce noise d) To improve bandwidth

14. What is the primary cause of crosstalk in data communication?

a) Interference between adjacent wires b) Signal attenuation c) Noise d) Dispersion

15. What is the primary purpose of equalization in data communication?

a) To compensate for signal distortion b) To increase signal strength c) To reduce noise d) To improve bandwidth

Physical Layer MCQs

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