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WorksheetsExam Review_Digital Signals
Total questions: 15
Worksheet time: 8mins
Which is false about fiber optic cables?
They rely on total internal reflection to transmit signals.
The glass fiber is highly absorbent.
They can send signals a long distance without the signals degrading.
The cladding causes the light to reflect.
A square wave with values 0 and 1 is an example of a(n)__________signal.
Continuous
Digital
Which is NOT a property of electromagnetic waves?
They lose energy as they move through mediums.
They can be varied to hold information.
They transfer energy but not matter.
They consist of a series of pulses.
Which best explains why the receiver of a signal must understand the code or language being used?
This allows the signal to be decoded.
This allows the signal to be transmitted.
This allows the signal to be converted to binary.
This allows the signal to be encoded.
Sequence the three steps that must occur for a signal to be communicated effectively.
Transmit, encode, decode
Decode, transmit, encode
Encode, transmit, decode
Transmit, decode, encode
Digital signals _____________.
can only be stored on computers
consist of only two values
cannot be transmitted by light waves
are what is stored by camera film
How does the data displayed by an alcohol thermometer and a digital thermometer differ?
Alcohol Thermometer is continuous, digital thermometer shows discrete values
Alcohol Thermometer is continuous, digital thermometer is also continuous
Alcohol Thermometer shows discrete values, digital thermometer shows discrete values
Alcohol Thermometer shows discrete values, digital thermometer is continuous
Computers use digital information that is encoded as_________numbers.
Nonbinary
Binary
None of the above
Both A and B
Which does NOT help explain why digital signals are more reliable than analog signals?
Noise is more easily filtered from digital signals.
Digital signals are smooth and continuous.
Digital signals consist of two values only.
Analog signals deteriorate due to noise.
Which is an example of a signal being encoded?
reading braille
writing a word in Morse code
hearing sound from a radio
receiving an email
Which do NOT interfere with FM radio transmissions?
Mountains
Buildings
Bad Weather
AM Transmission
Light waves stay inside an optical fiber as they are transmitted because the ________.
light waves curve to follow the path of the fiber
fiber is insulated to prevent loss of thermal energy
fiber reflects the light back into the core
fiber is perfectly straight
Analog signals are______ affected by noise than digital signals.
More
Less
Both affected the same
Light waves, radio waves, and microwaves are examples of electromagnetic waves.
True
False
Which is the best model of an analog signal?
a smooth wave
a light switch going on and off
a series of 1’s and 0’s
a series of pulses
