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ANALOG AND DIGITAL COMMUNICATION

Total questions: 55

Worksheet time: 27mins

Name
Class
Date
1.

Why a sinusoidal signal is considered analog?

a)

a) It moves in both positive and negative direction

b)

b) It is positive for one half cycle

c)

c) It is negative for one half cycl

d)

d) It has an infinite number of amplitudes in the range of values of the independent variable

2.

What is Demodulation?

a)

Process of varying one or more properties of a periodic waveform

b)

Recovering information from a modulated signal

c)

Process of mixing a signal with a sinusoid to produce a new signal

d)

Involvement of noise

3.

VIDEO SIGNAL ARE

a)

AM

b)

FM

c)

PM

d)

PCM

4.

This is the example of

a)

unit step function

b)

gausian function

c)

sinc function

d)

random function

5.

Band width of AM signal is

(a)  

6.

Before a signal is sent, it must be decoded.

a)

True

b)

False

7.

How does noise affect a signal?

a)

It causes the signal to deteriorate

b)

It amplifies the signal

c)

It allows the signal to travel further

d)

It changes the signal as it moves from one medium to another

8.

Which correctly orders the steps of communication using signals?

a)

encode, transmit, decode

b)

transmit, encode, decode

c)

decode, transmit, encode

d)

transmit, decode, encode

9.

The following is the graph of ___________________________

a)

An analog signal

b)

A digital signal

10.

All of the following are types of electromagnetic waves that can be used to transmit signals except ________________.

a)

sound waves

b)

light waves

c)

radio waves

d)

microwaves

11.

The following is the graph of ___________________________

a)

An analog signal

b)

A digital signal

12.

An analog signal is one that changes continuously

a)

True

b)

False

13.

Radio waves are an example of a digital signal.

a)

True

b)

False

14.

Computers use a series of ___________________ numbers to encode information

a)

large

b)

multiple

c)

single

d)

binary

15.

Which is the best model of an analog signal?

a)

a smooth wave

b)

a light switch going on and off

c)

a series of 1’s and 0’s

d)

a series of pulses

16.

Which best compares the reliability of analog signals and digital signals?

a)

Only analog signals are reliable

b)

Analog signals are more reliable than digital signals

c)

Digital signals are more reliable than analog signals

d)

Both types of signals are equally reliable

17.

Which best describes binary numbers?

a)

a continuously changing wave

b)

a set of two discrete values

c)

a large array of values

d)

a set of four or five numbers

18.

For which type(s) of signals does noise alter the original information?

a)

analog only

b)

digital only

c)

both analog and digital

d)

neither analog nor digital

19.

How can you get a higher quality digital signal from an analog recording?

a)

lower the amplitude of the analog signal

b)

raise the amplitude of the analog signal

c)

lower the sampling rate of the analog signal

d)

raise the sampling rate of the analog signal

20.

A computer engineer studying software would be focused on...

a)

the soft parts of technology, such as the rubber coating around the wires.

b)

the antenna within the technology that sends and receives the data

c)

the computer that runs the physical parts of the technology

d)

the programming that makes the physical parts of the technology run

21.
How does technology affect the way people communicate?
a)
it allows people to communicate with others quickly and at a low cost
b)
it makes people less motivated to communicate with others
c)
it does not affect the ways people communicate
d)
it makes it difficult to maintain privacy when communicating with others
22.

True or False: Communication is more than just talking face to face?

a)

True

b)

False

23.
Technology's goal is to 
a)
improve the way people live
b)
give us cool inventions
c)
take all of our time away
d)
make us sleepy
24.

When was the first text message sent?

a)

1974

b)

1981

c)

1992

d)

1999

25.
Is music playing from a record an analog or digital signal?
a)
Analog
b)
Digital
26.
Is a video game coded as analog or digital data?
a)
Analog
b)
Digital
27.
The string of 1s and 0s that control a computer is called _____ code.
a)
binary
b)
dichotomous
c)
Morse
d)
two-number
28.
Which type(s) of signal(s) can be easily corrected to remove noise?
a)
Analog
b)
Digital
c)
Both
d)
Neither
29.
Analog signals can be converted to digital through a process called _____.
a)
conversion
b)
processing
c)
sampling
d)
translation
30.
Setting the color of each pixel on a computer screen requires a _____ signal.
a)
analog
b)
digital
c)
loud
d)
fast
31.
The signal above is an example of a(n)
a)
Digital Signal
b)
Analog Signal
32.
Smooth and continuous data
a)
analog
b)
digital
c)
pulse
d)
binary
33.
Digital offers better clarity, but analog gives you richer quality.
a)
True
b)
False
34.

A big disadvantage of digital technology is the recording does degrade over time.

a)

True

b)

False

35.

An analog signal is sent in discrete pulses in two states, on= 1 or off= 0.

a)

True

b)

False

36.
How can a signal be transmitted?
a)
Tone
b)
Light
c)
Electric Pulses
d)
All of the Above
37.
In a digital signal information is stored in:
a)
bits
b)
waves
38.

Which of the following is an example of an Analog signal?

a)
b)
c)

Both of these

d)

Neither of these

39.
How many bits are in a byte?
a)
1
b)
2
c)
4
d)
8
40.
What is a one or zero called in coding?
a)
Byte
b)
Code
c)
Switch
d)
Bit
41.
Which is an example of an analog signal?
a)
Blu-Ray DVD
b)
VHS Tape
42.
Is this digital or analog?
a)
Digital 
b)
Analog
43.
Is this digital or analog?
a)
Digital 
b)
Analog
44.

The picture shows an example of what kind of signal?

a)

Analog

b)

Digital

45.
What value (number) can an analog signal have?
a)
1 or 0
b)
Any whole number/value
c)
Any number/value
d)
It always depends on the type
46.

Which of the following is an example of an Digital signal storage?

a)
b)
c)
d)

All of these

47.
Why are digital signals more reliable in transmitting information than analog signals? 
a)
They are more powerful
b)
They carry less information
c)
They have less interference over long distances
d)
They have more interference over long distances
48.

Identify a disadvantage of an analog signal:

a)

Requires low power

b)

Doesn't get interference

c)

When copied, quality goes down

d)

Hardware is usually small

49.
A signal is a way to transmit ________________ by means of gesture,action, sound, or other means.
a)
money
b)
information
c)
time
d)
light
50.
Which of the following is an example of a digital signal?
a)
Mercury Thermometer
b)
VHS Tape
c)
Blu-Ray
d)
Analog Clock
51.
Which of the following is an advantage of analog signals
a)
Less prone to interference
b)
Requires less power
c)
Travels Farther
d)
Carries more detailed information
52.

_____ signals have greater resolution.

a)

digital

b)

analog

53.

____ signals are more reliable.

a)

digital

b)

analog

54.

How do computer hard drives and USB drives store data?

a)

binary code

b)

pictures

c)

symbols

d)

words

55.

Before a signal is sent, it must be decoded.

a)

True

b)

False

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