11th class Computer Unit 3 MCQs
Chapter 3 MCQs 11th Class Computer
Data Communications:
1. Microwave transmission, coaxial cables and fiber optics are examples of:
a. Gateways
b. Modems
c. Ring network
d. Communication links
2. Data communication requires only a:
a. Transmission medium
b. Sender
c. Receiver
d. All of the above
3. Physical path that connects the source and receiver is known as:
a. Encoder
b. Communication channel
c. Linear medium
d. Decoder
4. Data communication requires only:
a. Transmission medium
b. Sender
c. Receiver
d. All of these
5. Data processing is also known as:
a. Speed
b. Accuracy
c. Merging
d. Computing
6. The devices that receives data:
a. Transmitter
b. Source
c. Encoder
d. Sink
7. The process of transferring data electronically from one place to another is called:
a. Data sequencing
b. Data processing
c. Data sender
d. Data communication
8. All of the following are elements of data communication system EXCEPT:
a. Medium
b. Sender
c. Voltage
d. Receiver
9. How many devices can exist between a sending and receiving host?
a. 10
b. 1
c. Any
d. 2
10. Digital signal represents a sequence of ………values.
a. Unique
b. Continuous
c. Bytes
d. Discrete
11. Sound, light and radio waves are examples of ………signal:
a. Simple
b. Digital
c. Green
d. Analog
12. Frequency is measured in:
a. Hertz
b. Seconds
c. Amps
d. Bps
13. The amplitude is measured in:
a. Digits
b. Hertz
c. Points
d. Volts
14. The signals produced by a computer to send over phone line must be converted to:
a. Digital signals
b. High signals
c. Low signals
d. Analog signals
15. A signal is a representation of:
a. Sun wave
b. Light wave
c. Full wave
d. Heat wave
16. The number of times a wave repeats during specific time interval is called:
a. Frequency
b. Pulse
c. Phase
d. Amplitude
17. Analog signals are measured in:
a. Digit
b. Hertz
c. Watts
d. Volt
18. The electromagnetic or light waves that represent data are:
a. Waves
b. Pulse
c. Signal
d. Information
19. The height of wave within a given period of time is known as:
a. Phase
b. Frequency
c. Pulse
d. Amplitude
20. Modern computers can perform or processes at:
a. Per second
b. Per Nano second
c. Per minute
d. Per Micro second
21. A communication signal in the form of corneous were called:
a. Analog
b. Digital
c. Modulation
d. None of these
22. Amplitude is the characteristic of:
a. Parallel signal
b. Digital signal
c. Serial transmission
d. Analog signal
23. ……… is a continuous electrical signal in the form of wave:
a. Green signal
b. Analog signal
c. Red signal
d. Digital signal
24. The electromagnetic or light waves representing data are called:
a. Coding
b. Information
c. Mode
d. Signal
25. The types of signals can be:
a. A or b
b. Digital
c. Clear
d. Analog