Signals and Communication & Technology Review

Elias was reading a book about the history of Morse code. He was particularly

interested in how the circuits allow the code to be created and sent. The signal is created by pulses of energy called a(n) ____________ when a switch is closed on a circuit.

• electrical wave

• electrical impulse

• wave impulse

• mechanical wave

What differences are there between the digital and analog recordings?

Choose the two that apply.

• Digital signals are continuous.

• Analog signals are higher resolution.

• Digital signals can be better stored electronically.

• Analog signals consist of numerical values recorded at a specific

  time interval.

• Digital signals take up more space.

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NGSS.MS-PS4-3

Noah wanted to convert the analog recording into a digital signal so that

he could put it on his mp3 player. What could Noah do to get the

highest quality digital signal from the analog recording?

• lower amplitude of analog signal

• higher amplitude of analog signal

• lower sampling rate of analog signal

• higher sampling rate of analog signal

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NGSS.MS-PS4-3

Harper and Ava passed notes to each other in the hallway between

classes. They used a type of binary code so that others wouldn’t be

able to read the notes. What symbols do the friends use in their notes?

• bytes and digits

• analog and digital

• dots and dashes

• pixels and bits

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NGSS.MS-PS4-3

Information that is sent as a pattern in a controlled flow of current through a circuit is called an ___________________________.

• pulsating signal

• electromagnetic signal

• electronic signal

• motivational signal

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Aroha enjoys walking to the beach and photographing the sunset.

When she downloads the images to her computer, she saves two

different versions. She keeps one version with the full amount of pixels,

so that she can use the images for any project in the future. In the

second version, she reduces the number of pixels by half. What would

be a benefit of reducing the number of pixels?

• less storage space

• better quality

• better for creating large posters

• less boxy-looking

A _______ _______ is a pulse of energy that travels through a circuit when it is closed.

• big pulse

• wave pulse

• electrical pulse

• electromagnetic pulse

Information sent as patterns of electromagnetic waves such as visible light, infrared waves, microwaves, and radio waves are ____________________ __________.

• electric signals

• electronic signals

• magnetic signals

• electromagnetic signals

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NGSS.MS-PS4-3

A signal that allows for a continuous record of some kind of action.

• analog signal

• digital signal

• turn signal

Tags

NGSS.MS-PS4-3

A signal that allows for a record of numerical values of an action at a set of continuous time intervals.

• analog signal

• turn signal

• digital signal

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