Midterm Q2 Exam Review 2020

Which best describes a difference between electric current and static electricity?

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• Electric current is continuous, and static electricity is not continuous.

• Static electricity is continuous, and electric current is not continuous.

• Electric current involves the movement of electrons, and static electricity involves the movement of protons.

• Static electricity involves the movement of electrons, and electric current involves the movement of protons.

A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit?

• More electric charge would flow in the circuit.

• Less electric charge would flow in the circuit.

• The resistance in the circuit would decrease.

• The resistance in the circuit would increase.

Samantha is observing a salt crystal under a microscope. She wants to view more details by enlarging the image of the crystal. Which would allow her to do this?

• increasing the amount of light that shines on the crystal

• decreasing the amount of light that shines on the crystal

• increasing the strength of the objective lens

• decreasing the strength of the objective lens

Tags

NGSS.HS-PS4-5

Which best explains how fiber-optic technology benefits the field of medicine?

• It allows doctors to view internal body structures to help them diagnose illnesses.

• It helps surgeons make more accurate repairs to broken blood vessels.

• It allows doctors to magnify cells so they can identify unhealthy cells that cause cancer.

• It helps surgeons make cuts that are smaller and less painful than traditional methods.

What happens when someone lets go of the button on an electric doorbell?

• The electromagnet gets stronger.

• The circuit is broken and the electromagnet turns off.

• The current moving through the circuit changes direction.

• The metal striker hits the bell.

Which most likely uses only alternating current?

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Which wave is carrying the most energy?

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Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?

• The amplitude of the wave will increase.

• The amplitude of the wave will decrease.

• The speed of the wave will increase.

• The speed of the wave will decrease.

Tags

NGSS.HS-PS4-1

Two objects are held close together. When they are released, they move toward one another. Which conclusion is supported by this evidence?

• The objects are both positively charged.

• The objects are both negatively charged.

• The objects have no charge.

• The objects have opposite charges.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which change will decrease the electric force between two positively charged objects?

• moving them closer together

• moving them farther apart

• adding neutrons

• removing electrons

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5