1. What uses a physical star topology ?

10 base 5

10 base 2

10 base T

None of these

2. Frequency range at which the land coaxial cables are used, is

106 to 108 Hz

1010 to 1011 Hz

103 to 104 Hz

None of these

3. In a broad sense, a railway track is an example of

simplex

half-duplex

full-duplex

All of these

4. Bit stuffing refers to

inserting a '0' in user stream to differentiate it with a lag

inserting a '0' in lag stream to avoid ambiguity

appending a nibble to the lag sequence

appending a nibble to the use data stream

5. Unmodulated signal coming from a transmitter is known as

carrier signal

baseband signal

primary singal

None of these

6. Method of communication in which transmission takes place in both directions, but only in one direction at a time, is called

simplex

four wire circuit

full duplex

half duplex

7. Thick coax have maximum segment of

500 m

200 m

100 m

700 m

8. Twisted pair have maximum segment of

500 m

200 m

100 m

2000 m

9. Fibre optics have maximum segment

500 m

200 m

100 m

2000 m

10. Modem is used in data trasmission. When was it involved and in which country ?

1963, USA

1965, Germany

1950, USA

1950, Japan