Related Questions

Based on the information below, how much did a certain telephone call cost? 1. The call lasted 1 minute 27 seconds 2. The cost for the first 30 second unit is Tk. 1.80, call duration more than 30 seconds costs Tk. 0.90 per 30 second unit 3. Any call duration less than 30 seconds is rounded up to the nearest 30-second unit.
A Tk. 1.80
B Tk. 2.61
C Tk. 2.70
D Tk. 3.51
Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
A Interface
B Modem
C Attenuation
D Teleprocessor
E None of the above
Total number of telephone calls is 'n' call charge is Tk. 'p' per call. Then total call charge is:
A ( n + p)
B (n-p)
C (n *p)
D (none of them)
Total number of telephone calls is ‘n’, call charge is TK. ‘p’ per call. Then total call charge is:
A (n+p)
B (n-p)
C np
D none of then
In a PC to telephone hookup for long distance communication, modem is connected between the telephone line and
A PC
B synchronous port
C crossover cable
D asynchronous port
E None of the above
Many large organizations with their offices in different countries of the world connect their computers through telecommunication satellites and telephone lines. Such a communication network is called
A LAN
B WAN
C ECONET
D EITHERNET
E None of the above
When a group of computers is connected together in a small area without the help of telephone lines, it is called
A Remote communication network (RCN)
B Local area network(LAN)
C Wide area network (WAN)
D Value added network (VAN)
E None of the above
How many networks and nodes per network, are allowed by the Class B network?
A 127 networks and 16,777,216 nodes per network
B 16,384 networks and 65,534 nodes per network
C 2,097,152 networks and 254 nodes per network
D All of the above
E None of the above
Messages from one computer terminal can be sent to another by using data networks. The message to be sent is converted to an electronic digital signal, transmitted via a cable, telephone or satellite and then converted back again at the receiving end. What is this system of sending messages called?
A Paperless office
B Electronic mail
C Global network
D Electronic newspaper
E None of the above
Which class network is used for a collection of a small number of networks with a large number of nodes?
A Class A
B Class B
C Class C
D All of the above
E None of the above

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