What differences are there between the digital and analog recordings? Choose the TWO that apply.

Analog signals are higher resolution.

Digital signals can be better stored electronically.

Digital signals are continuous.

Analog signals consist of numerical values recorded at a specific time interval.

Digital signals take up more space.

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?

higher sampling rate of analog signal

lower amplitude of analog signal

higher amplitude of analog signal

lower sampling rate of analog signal

Sarah 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?

better for creating large posters

The diagram shown is an unlabeled transverse wave. Which of the following statements is TRUE?

Decreasing C will increase the energy.

C represents the amplitude of the wave.

Increasing D will decrease the energy.

Increasing C will increase the energy.

The diagram shown is an unlabeled transverse wave. Which of the following statements is TRUE?

D is the amplitude of the wave.

B is the compression of the wave.

C is the frequency of the wave.

Which of the following is TRUE about the different types of wave?

Mechanical waves can be either longitudinal or transverse.

Sound waves are both electromagnetic and longitudinal.

Electromagnetic waves require a medium and cannot travel through space.

Longitudinal waves vibrate matter at right angles.

A student is using a metal coil to model the properties of different types of waves. Based on the image below, which of the following is most likely FALSE?

The student is investigating how to determine the frequency of a transverse wave.

The student is modeling longitudinal waves.

The metal spring vibrates parallel to the direction of energy movement.

The student is modeling how sound waves travel.

Which of the following describes an advantage of parallel circuits?

If one device goes out, the others are unaffected.

Each device shares the voltage.

Adding devices reduces the current.

More voltage is needed to reach an appropriate current.

Which of the following would result in a circuit with 1.2 amps of current?

a 3-V battery and a 2.5-Ω resistor

a 6-V battery and a 10-Ω resistor

a 1.5-V battery and a 5-Ω resistor

a 4.5-V battery and a 7.5-Ω resistor

Which of the following is TRUE about the circuit shown?

Adding another battery would increase the brightness of each light bulb.

The circuit is an open circuit.

If one light bulb goes out, the others will be unaffected.

The circuit is a parallel circuit.

A musician records and mixes his own music. His process includes playing each instrument individually while recording the music on his computer. He then uses special software to combine the individual recordings. Lastly, he records his voice as he sings the accompanying lyrics, adding this to the instrumental background. He uploads the final product to a cloud that he shares with his family and friends. What is happening to the signals during this process?

Analog signals are being converted to digital signals so that they can be combined, altered, and shared.

The signals remain analog throughout the entire process. Both the music and computer work can be done with analog.

The signals remain digital throughout the entire process. Both the music and computer work can be done with digital.

Digital signals are being converted to analog signals so that they can be combined, altered, and shared.

A sound engineer was working on cleaning up the noise from an analog signal and from a digital signal. Which signal would she have a harder time erasing the noise from?

analog, because it is a continuous signal with infinite values, and the noise is blended in

digital, because it is a continuous signal with infinite values, and noise is blended in

analog, because it is a discrete signal made up of ones and zeroes, and noise is blended in

digital, because it is a discrete signal made up of ones and zeroes, and noise is blended in

WAVES & INFO. TECHNOLOGIES

Authored by Andrew Niswander

Science

8th Grade

NGSS covered

Used 6+ times

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Content View

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35 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A complete, unbroken path through which electric charges can flow.

electric circuit

voltages

resistance

Ohm's law

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The difference in electrical potential energy per charge between two places in a circuit.

voltage

resistance

wave pulse

series circuit

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The measurement of how difficult it is for charges to flow through an object.

resistance

longitudinal wave

voltage

parallel circuit

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The law that states the resistance in a circuit is equal to voltage divided by current.

Ohm's law

wave pulse

software

electrical circuit

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An electric circuit in which all parts are connected one after another along one path.

series circuit

parallel circuit

longitudinal wave

Ohm's law

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An electric circuit in which different parts of the circuit are on separate branches.

parallel circuit

series circuit

transverse wave

analog signal

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A disturbance that transfers energy from place to place.

wave

analog signal

digital signal

electrical circuit

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WAVES & INFO. TECHNOLOGIES

A complete, unbroken path through which electric charges can flow.

The difference in electrical potential energy per charge between two places in a circuit.

The measurement of how difficult it is for charges to flow through an object.

The law that states the resistance in a circuit is equal to voltage divided by current.

An electric circuit in which all parts are connected one after another along one path.

An electric circuit in which different parts of the circuit are on separate branches.

A disturbance that transfers energy from place to place.

A wave that requires a medium through which to travel.

A wave that moves the medium at right angles to the direction in which the wave travels.

A wave that moves the medium in a direction parallel to the direction in which the wave travels.

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