Eighth Grade Common Formative Quiz

A student wrapped a wire around an iron nail and connected the wire to a battery. The nail became magnetized, as shown in Diagram 1. When the battery was disconnected, the nail was no longer magnetized, as shown in diagram 2.

Which statement best describes what occurred during this investigation?

• A new property was acquired when the nail became magnetized and caused a chemical change.

• When the nail became magnetized the iron atoms in the nail were temporarily aligned and caused a physical change.

• The electric current passing through the wires heated the nail and caused the nail to undergo a chemical change.

• The electric current passing through the nail temporarily changed the iron atoms into another substance and caused a physical change.

Tags

NGSS.MS-PS2-3

After a storm, a hospital may have to rely on a backup generator to power some equipment. Which is the energy conversion provided by the generators?

• mechanical energy to electrical energy

• thermal energy to mechanical energy

• nuclear energy to mechanical energy

• thermal energy to electrical energy

Tags

NGSS.HS-PS3-3

A generator converts mechanical energy to electrical energy by using a conducting metal loop turning in a....

• magnetic field

• gravitational field

• steel sphere

• copper sphere

Tags

NGSS.MS-PS2-3

A device that converts mechanical energy into electricity is a...

• generator

• meter

• motor

• solenoid

The Hoover Dam produces about 4.2 billion kilowatt- hours of energy each year, using flowing water to rotate fan-like blades in turbine generators. Which of the following summarizes the production of energy at Hoover Dam?

• Mechanical Energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

• Mechanical energy of the flowing water is transformed into thermal energy by rotating coils in a magnetic field, producing a direct current.

• Thermal energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.

• Thermal energy of the flowing water is transformed into mechanical energy by rotating coils in a magnetic field, producing a direct current.

Tags

NGSS.MS-PS3-5

Roberto is sliding down a plastic slide on the playground. After he reaches the ground, he feels a small electric shock when he touches a piece of metal. What has been built up on his body that causes the shock?

• atoms

• electrons

• neutrons

• protons

Tags

NGSS.MS-PS2-3

One student rubs a balloon against his hair several times. Another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is MOST likely reason the comb is able to repel the balloon?

• The balloon has a positive charge and the comb is neutral.

• The balloon and the comb have the same electrical charge.

• The balloon has a negative charge and the comb is neutral.

• The balloon and the comb have opposite electrical charges.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Marty rubbed a balloon on his shirt. The balloon was then able to stick to the wall of the room. Which picture BEST represents the charges of the particles on the balloon and the wall that cause the balloon to be attracted to the wall?

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Tags

NGSS.MS-PS2-3

A student wants to study the magnetic forces between three magnets. The student sets up an experiment by hanging three magnets next to each other.

Which position will the magnets MOST likely take once the student places the magnets on the strings?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet. Greta observed the stream of water bend toward the comb.

How did passing a comb through her hair allow the comb to bend the stream of water?

• by making the comb more absorbent

• by giving the comb an electrical charge

• by increasing the thermal energy of the comb

• by breaking some of the chemical bombs in the comb

Tags

NGSS.MS-PS2-3