11th class Computer Unit 3 MCQs
101. Transmission that is used without timing signal is called:
a. Parallel
b. Synchronous
c. Isochronous
d. Asynchronous
102. Which value in start bit indicates that the transmission line is idle?
a. 3
b. 1
c. 2
d. 0
103. A type of communication that sends data using flow control to synchronize data between sender and receiver is called:
a. Isochronous transmission
b. Asynchronous transmission
c. Monochromes transmission
d. Synchronous transmission
104. A type of communication that send that uses a clock to control timing of bits being sent is called:
a. Isochronous transmission
b. Synchronous transmission
c. Monochromes transmission
d. Asynchronous transmission
105. Which communication technique can transmit the data over long distance:
a. Bandwidth
b. Baseband
c. Bit band
d. Broadband
106. Transmission media are usually categorized as:
a. Guided or unguided
b. Good and bad
c. Baseband and broadband
d. Fixed or unfixed
107. The medium in which signals are sent and received through a cable or wire is called:
a. Local media
b. Guided media
c. International media
d. Unguided media
108. What is another term for guided media?
a. Bounded
b. Radiated
c. Infrared
d. Wireless
109. What is another term for unguided media?
a. Unbounded
b. Radiated
c. Infrared
d. Wire
110. Which of the following transmission media is used in LAN?
a. Coaxial cable
b. Satellite
c. Telephone line
d. Microwave
111. Which of the following consists of thin glass to transmit beams of light?
a. Fiber optic cable
b. Twisted pair
c. Microwave
d. Coaxial cable
112. The typical fiber optic cable consists of very narrow strand of glass called:
a. Base
b. Core
c. Sheet
d. Cladding
113. An important property of fiber optic cable is:
a. Radiation
b. Degradation
c. Noise
d. Refraction
114. Which is the most secure type of transmission medium?
a. Coaxial cable
b. Twisted wire pair
c. Fiber optic cable
d. Microwave
115. A fiber optic cable’s core is measured in:
a. Centimeters
b. Inches
c. AWG
d. Microns
116. Satellite transmission stations that can both send and receive messages are called:
a. Mars stations
b. Earth stations
c. Jupiter stations
d. Moon stations
117. Transmission from a satellite to its earth based station is called:
a. Base link
b. Uplink
c. Geolink
d. Downlink
118. Transmission from earth to satellite is called:
a. Low link
b. Uplink
c. High link
d. Downlink
119. Which of the following can severally affect the quality of satellite transmission?
a. Light rays
b. Bad weather
c. Moon
d. Mountains
120. The time taken by a data signal to reach to moon and then back to earth was about:
a. 2ms
b. 2 minutes
c. 2 hours
d. 2 second
121. Which medium transmits voice and data via air as high frequency radio waves?
a. Fiber optic cable
b. Twisted pair
c. Microwave
d. Coaxial cable
122. All of the following are guided communication media except:
a. Coaxial cable
b. Twisted pair
c. Satellite
d. Fiber optic cable
123. Which of the following consists of two insulated copper wires twisted together?
a. Submarine
b. Fiber optic
c. Coaxial cables
d. Twisted pair wire
124. An advantage of synchronous over asynchronous transmission is:
a. No error checking
b. Simplicity
c. Two ways communication
d. Speed
125. The number of frequencies that can fit on a link at one time is called:
a. Demodulation
b. Band width
c. Codec
d. Modulation