Answers OK-Physical Science BLab: Magnetic and Electric Fields

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What must be true in order for magnetism to induce an electric current in a wire?

There needs to be a switch in the circuit.

There cannot be a switch in the circuit.

The wire must be part of a closed circuit.

The wire must be part of an open circuit.

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The table shows the dimensions of four wedges.

The diagram shows parts of a wave.Which is shown by the letter X?

trough

amplitude

crest

wavelength

Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temperature spoon. Which substance will have heat flow from it to the other substances?

the milk

the spoon

the oatmeal

the surrounding air

Which of these actions would increase heat transfer between two objects?

establishing their thermal equilibrium

increasing the area of their contact

using objects with similar specific heats

reducing the time of their contact

Under which condition is no work done?

A force pushes an object and slows it down.

A force pulls an object and speeds it up.

A force pulls down on an object that moves downward.

A force pushes up on an object that stays in place.

Hedea made a study chart about nuclear energy.Which best describes the error in Hedea’s chart?

The nuclei of atoms are split apart in both fission and fusion.

The nuclei of atoms are joined together in both fission and fusion.

Fission converts nuclear energy to electrical energy, not thermal energy.

Fission and fusion convert nuclear energy to both radiant and thermal energy.

Which is equal to a temperature of 20°C?

20°F

68°F

36°F

32°F

The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released?

It will move toward the second magnet because like poles repel.

It will move toward the second magnet because like poles attract.

It will move away from the second magnet because like poles repel.

It will move away from the second magnet because like poles attract.

Which occurs when a warm fluid cools down?

Energy is released to the environment.

Energy is absorbed from the environment.

The density of the fluid decreases.

The mass of the fluid decreases.

The diagram shows two charged objects, A and B.

A: positiveB: negative

A: negativeB: positive

A: negativeB: negative

A: positiveB: positive

Two bar magnets are held close together. When they are released, they move toward one another. Which best describes the original placement of the magnets?

The magnets are placed end to end with the north pole of each pointing toward the other.

The magnets are placed end to end with the south pole of each pointing toward the other.

The magnets are placed side by side with the like poles of each magnet near the other.

The magnets are placed side by side with the opposite poles of each magnet near the other.

Measurements of two electric currents are shown in the chart.

Current X has a greater potential difference, and the charges flow at a slower rate.

Current Y has a greater potential difference, and the charges flow at a slower rate.

Current X has a greater potential difference, and the charges flow at a faster rate.

Current Y has a greater potential difference, and the charges flow at a faster rate.

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