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WorksheetsDigital Communication Quiz
Total questions: 30
Worksheet time: 15mins
What does PCM primarily do in digital communication?
Changes the shape of an antenna
Converts analog signals to digital signals
Translates digital signals to Morse code
Increases signal noise
Why is it important to sample a signal at a high enough rate in PCM?
To make it louder
To avoid signal distortion
To make it colorful
To convert it into text
What common device uses PCM for audio recording?
Mobile phone
Microwave oven
Bicycle computer
Flashlight
What determines the quality of a PCM signal?
Signal strength
Sampling rate
Length of the cable
Color of the signal
What is an advantage of digital transmission over analog?
It is less affected by noise
It uses more power
It's only for video signals
It's slower
Why is synchronization important in digital communication?
To save battery life
To ensure data arrives correctly
To make the signal brighter
To improve sound quality
Which of the following is an example of digital transmission?
A conversation over a walkie-talkie
Watching a movie on a DVD
Listening to an old radio broadcast
Reading a book
What is the purpose of a protocol in digital communication?
To control traffic lights
To standardize how devices communicate
To store extra data
To limit internet usage
Which protocol is responsible for routing data on the internet?
FTP
IP
HTTP
SMTP
What does TCP do in the TCP/IP model?
Handles data encryption
Ensures reliable data delivery
Tracks the user's location
Converts text to binary
Why is the OSI model helpful in understanding communication?
It provides step-by-step guidelines
It simplifies programming
It connects two wires directly
It focuses only on hardware issues
What does multiplexing allow?
Sharing a single channel for multiple signals
Adding extra signals to improve clarity
Blocking unauthorized communication
Creating larger antennas
Why is switching important in digital networks?
It allows efficient routing of data
It powers off devices when idle
It speeds up charging
It converts data into light
In which type of switching does data travel in small packets?
Circuit switching
Packet switching
Message switching
Manual switching
Which multiplexing method is based on dividing frequency ranges?
Time Division Multiplexing
Frequency Division Multiplexing
Space Division Multiplexing
Digital Division Multiplexing
What is the main purpose of error detection?
To identify and correct signal noise
To improve signal clarity
To identify and notify errors in transmitted data
To double-check power levels
Which method uses a simple parity bit for error detection?
Hamming Code
Cyclic Redundancy Check
Parity Check
Reed-Solomon Code
What does error correction aim to do?
Detect mistakes but not fix them
Fix errors after detection
Improve audio clarity
Avoid data encryption
Hamming Code can detect and correct how many errors at a time?
One error
Two errors
Three errors
No errors
What is the Nyquist theorem used for?
Determining bandwidth
Calculating the minimum sampling rate
Measuring signal strength
Converting digital to analog
Why is binary used in digital communication?
It's simple and less prone to errors
It's faster to write
It's harder to understand
It uses less energy
What does CRC stand for?
Cyclic Redundancy Check
Critical Reaction Code
Control Response Check
Cyclic Reaction Code
What is an IP address?
A unique identifier for devices in a network
A power source for routers
A type of antenna
A code to open Wi-Fi connections
How does data travel in packet switching?
In small, independent units
In a single uninterrupted line
Along the same path every time
In encoded sound waves
What layer of the OSI model deals with end-to-end communication?
Application layer
Transport layer
Network layer
Physical layer
What is the unit of data in PCM?
Byte
Sample
Frame
Pulse
What does multiplexing save?
Bandwidth
Power
Time
Cost
What is a characteristic of a digital signal?
Discrete levels
Continuous variation
Uses AM/FM modulation
Transmits through sound
Which switching method is most efficient for the internet?
Packet switching
Circuit switching
Manual switching
Frequency switching
What ensures reliable communication between computers?
Protocols
Screen size
Keyboard layout
Cable color
