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Science - 8th Grade

Authored by Ethan Evans

Science

8th Grade

Science - 8th Grade
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47 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

A student builds a device by wrapping wire around an iron nail and connecting the ends of the wire to a battery, as shown.

bar magnet

electric motor

electromagnet

generator

Answer explanation

The device described is an electromagnet. Wrapping wire around an iron nail and connecting it to a battery creates a magnetic field, turning the nail into a magnet when current flows, which is the defining characteristic of an electromagnet.

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Light and sound waves travel at different speeds through different mediums. Which table identifies the medium through which each wave will move fastest?

Light Wave - liquid, Sound Wave - gas

Light Wave - solid, Sound Wave - liquid

Light Wave - gas, Sound Wave - empty space

Light Wave - empty space, Sound Wave - solid

Answer explanation

Light waves travel fastest in empty space, as they do not require a medium. Sound waves travel fastest in solids due to closer particle arrangement, allowing quicker energy transfer. Thus, the correct choice is Light Wave - empty space, Sound Wave - solid.

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

A student attaches a rope to a cart and passes the rope through a pulley. The student attaches a mass to the rope, and the cart rolls up the ramp. Which explains why the cart rolls up the ramp after the student attaches the mass?

The noncontact force of gravity pulls the mass farther from the cart’s gravitational field.

The contact force of gravity pulls the mass farther from the cart’s gravitational field.

The noncontact force of gravity pulls the mass down farther into Earth’s gravitational field.

The contact force of gravity pulls the mass down farther into Earth’s gravitational field.

Answer explanation

The correct choice explains that the noncontact force of gravity pulls the mass down toward Earth, creating tension in the rope that causes the cart to roll up the ramp.

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

Select the table that shows how the signals will likely look after being copied many times.

Table A shows how the signals will likely look after being copied many times.

Table B shows how the signals will likely look after being copied many times.

Table C shows how the signals will likely look after being copied many times.

Table D shows how the signals will likely look after being copied many times.

Answer explanation

Table A accurately represents how signals appear after multiple copies, showing the expected patterns and characteristics that emerge from repeated duplication.

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

In which type of signal (analog or digital) does the copied signal most closely resemble the original signal in both diagrams?

Analog

Digital

Both

Neither

Answer explanation

The copied digital signal retains the original's discrete values, making it closely resemble the original in both diagrams. In contrast, analog signals can vary continuously, leading to potential distortions.

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

Refer to the diagrams labeled A and B. The copied analog signal in both diagrams appears to have more _______ compared to the copied digital signal.

distortion

clarity

amplitude

frequency

Answer explanation

The copied analog signal typically exhibits more distortion than the copied digital signal due to its continuous nature, which is more susceptible to noise and degradation during transmission and reproduction.

7.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

Refer to the diagrams labeled A and B. The type of signal that is less affected by copying, based on the appearance of the copied signal, is:

Analog signal

Digital signal

Both signals are equally affected

Neither signal is affected

Answer explanation

Digital signals maintain their integrity better when copied, as they consist of discrete values (0s and 1s). In contrast, analog signals can degrade and lose quality due to their continuous nature, making digital signals less affected by copying.

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