Analog vs Digital Signals - Middle School Physical Science
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Which type of signal is more resistant to noise in transmission: analog or digital?
Which type of signal is more resistant to noise in transmission: analog or digital?
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Digital. Discrete levels help distinguish signal from interference.
Digital. Discrete levels help distinguish signal from interference.
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Identify the signal type: a vinyl record stores sound as continuous grooves.
Identify the signal type: a vinyl record stores sound as continuous grooves.
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Analog. Physical grooves vary continuously with sound waves.
Analog. Physical grooves vary continuously with sound waves.
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Identify the signal type: a light has only OFF and ON states.
Identify the signal type: a light has only OFF and ON states.
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Digital. Only two states exist with no in-between values.
Digital. Only two states exist with no in-between values.
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Identify the signal type: a music file stores sound as sampled numbers.
Identify the signal type: a music file stores sound as sampled numbers.
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Digital. Sound is converted to discrete numerical measurements.
Digital. Sound is converted to discrete numerical measurements.
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What is one qualitative advantage of digital signals for copying and storage?
What is one qualitative advantage of digital signals for copying and storage?
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Copies can be made with little or no loss in quality. Exact duplication of discrete values preserves data.
Copies can be made with little or no loss in quality. Exact duplication of discrete values preserves data.
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What is one qualitative advantage of analog signals for representing natural changes?
What is one qualitative advantage of analog signals for representing natural changes?
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They can represent smooth, continuous changes directly. Natural phenomena often vary continuously, not in steps.
They can represent smooth, continuous changes directly. Natural phenomena often vary continuously, not in steps.
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Identify the signal type: a thermometer with a liquid column rising smoothly.
Identify the signal type: a thermometer with a liquid column rising smoothly.
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Analog. Mercury or alcohol expands continuously with temperature.
Analog. Mercury or alcohol expands continuously with temperature.
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Identify the signal type: a thermometer that shows temperature in whole-number steps.
Identify the signal type: a thermometer that shows temperature in whole-number steps.
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Digital. Display rounds to nearest degree, creating discrete steps.
Digital. Display rounds to nearest degree, creating discrete steps.
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Which option is a typical digital representation in electronics: $0$/$1$ or any voltage?
Which option is a typical digital representation in electronics: $0$/$1$ or any voltage?
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$0$/$1$. Digital circuits use two voltage levels for binary data.
$0$/$1$. Digital circuits use two voltage levels for binary data.
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Which option best matches analog communication: AM/FM radio or texting?
Which option best matches analog communication: AM/FM radio or texting?
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AM/FM radio. Radio waves carry continuously varying audio signals.
AM/FM radio. Radio waves carry continuously varying audio signals.
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Which option best matches digital communication: AM/FM radio or texting?
Which option best matches digital communication: AM/FM radio or texting?
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Texting. Messages are encoded as discrete characters and bits.
Texting. Messages are encoded as discrete characters and bits.
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Identify the signal type: a microphone produces a voltage that varies smoothly with sound.
Identify the signal type: a microphone produces a voltage that varies smoothly with sound.
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Analog. Voltage changes continuously to match sound pressure.
Analog. Voltage changes continuously to match sound pressure.
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Identify the signal type: a computer stores a picture as pixels with numbered color values.
Identify the signal type: a computer stores a picture as pixels with numbered color values.
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Digital. Each pixel has a discrete color code from finite options.
Digital. Each pixel has a discrete color code from finite options.
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Which description matches digital signals: “steps between levels” or “smooth curve”?
Which description matches digital signals: “steps between levels” or “smooth curve”?
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Steps between levels. Digital signals jump between levels, not curve smoothly.
Steps between levels. Digital signals jump between levels, not curve smoothly.
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Which option best describes analog data: continuous or discrete?
Which option best describes analog data: continuous or discrete?
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Continuous. Analog signals flow smoothly without breaks or jumps.
Continuous. Analog signals flow smoothly without breaks or jumps.
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Which type of signal is generally more resistant to noise during copying and transmission?
Which type of signal is generally more resistant to noise during copying and transmission?
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Digital. Discrete values can be perfectly reconstructed despite noise.
Digital. Discrete values can be perfectly reconstructed despite noise.
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Which option best describes digital data: continuous or discrete?
Which option best describes digital data: continuous or discrete?
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Discrete. Digital signals exist only at specific, separated values.
Discrete. Digital signals exist only at specific, separated values.
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Which type of signal is represented by a smooth, unbroken waveform on a graph?
Which type of signal is represented by a smooth, unbroken waveform on a graph?
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Analog. Analog waves flow continuously without sudden jumps.
Analog. Analog waves flow continuously without sudden jumps.
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Which type of signal is represented by a step-like waveform that jumps between levels?
Which type of signal is represented by a step-like waveform that jumps between levels?
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Digital. Digital signals jump between distinct levels instantly.
Digital. Digital signals jump between distinct levels instantly.
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Which signal type is most directly produced by a microphone before any computer processing?
Which signal type is most directly produced by a microphone before any computer processing?
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Analog. Sound waves are naturally continuous before digitization.
Analog. Sound waves are naturally continuous before digitization.
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Which signal type is stored as bits ($0$s and $1$s) in a computer file?
Which signal type is stored as bits ($0$s and $1$s) in a computer file?
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Digital. Computers only understand discrete binary values.
Digital. Computers only understand discrete binary values.
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Which option is an example of digital output: an on/off light sensor or a dimmer knob?
Which option is an example of digital output: an on/off light sensor or a dimmer knob?
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An on/off light sensor. Outputs only two states: fully on or fully off.
An on/off light sensor. Outputs only two states: fully on or fully off.
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Which option is an example of analog control: a dimmer knob or a keyboard key press?
Which option is an example of analog control: a dimmer knob or a keyboard key press?
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A dimmer knob. Smoothly varies brightness across all intermediate levels.
A dimmer knob. Smoothly varies brightness across all intermediate levels.
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Identify the best description of digital levels: infinitely many values or a set of fixed values.
Identify the best description of digital levels: infinitely many values or a set of fixed values.
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A set of fixed values. Digital signals can only exist at predetermined levels.
A set of fixed values. Digital signals can only exist at predetermined levels.
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Which device converts an analog signal into a digital signal for a computer to use?
Which device converts an analog signal into a digital signal for a computer to use?
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An analog-to-digital converter (ADC). Samples continuous signals and converts to discrete numbers.
An analog-to-digital converter (ADC). Samples continuous signals and converts to discrete numbers.
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