1. Which of the following communication modes support two-way traffic but in only one direction at a time?
a) simplex
b) half duplex
c) three-quarters duplex
d) all of the above
e) none of the above

2. Which of the following statement is correct?
a) terminal section of a synchronous modem contains the scrambler
b) receiver section of a synchronous modem contains the scrambler
c) transmission section of a synchronous modem contains the scrambler
d) control section of a synchronous modem contains the scrambler
e) none of the above

3. The channel in the data communication model can be?
a) postal mail services
b) telephone lines
c) radio lines
d) any of the above

4. In a synchronous modem, the receive equalizer is known as?
a) adaptive equalizer
b) impairment equalizer
c) statistical equalizer
d) compromise equalizer

5. A protocol is a set of rules governing a time sequence of events that must take place?
a) between peers
b) between an interface
c) between modems
d) across an interface

6. Which data communication method is used to transmit the data over a serial communication link?
a) simplex
b) half-duplex
c) full-duplex
d) b and c
e) None of above

7. In a synchronous modem, the digital-to-analog converter transmits signal to the? 
a) equalizer
b) modulator
c) demodulator
d) terminal
e) none of above

8. Which of the following signal is not standard RS-232-C signal?
a) VDR
b) RTS
c) CTS
d) DSR

9. Which of the following performs modulation and demodulation?
a) fiber optics
b) satellite
c) coaxial cable
d) modem
e) none of the above

10.The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as?
a) modulation
b) demodulation
c) synchronizing
d) digitising