Science 9 Unit D Chapter 2 Quiz

The Doctor needs to complete a circuit to save the earth (again). As her capable companion, you have been carrying around a rubber tube, a glass rod, a copper wire, and a wooden stick for just this possible scenario. You hand The Doctor copper wire because ...

• Copper can create current

• Copper provides the best resistance

• Copper is flexible

• Copper is a good electrical conductor

Upon completing the circuit and saving the earth, The Doctor thanks you for not choosing the other materials, which she refers to as “insulators”. Which of the following statements is true about insulators?

• Insulators allow current to flow when voltage is applied

• Electrons in insulators are not tightly bound to the nuclei

• Electrons in insulators are tightly bound to the nuclei

• Insulators do not have any electrons

As you and The Doctor begin to walk away from yet another successful mission, you notice that the copper wire becomes warm. The Doctor tells you not to worry and explains that this is most likely caused by

• Energetic protons giving off heat

• The current causing the wire to vibrate

• Heat transfer from the lamp in the circuit

• The wire providing some resistance to current flow

Mrs. Bolger wants to question Mr. LaDuke about what makes him such an excellent student teacher and hooks him up to a lie detector. A lie detector would indicate Mr. LaDuke is lying and hiding all his secrets if …

• There is a decrease in resistance

• There is an increase in resistance

• There is no change in conductivity

• There is a decrease in conductivity

The microwave in Mr. Maruyama’s classroom provides 16 Ω of total resistance in its circuitry. The microwave is connected to a 240 V outlet. How much current is the microwave drawing in?

• 0.07 A

• 15 A

• 240 A

• 3600 A

Mr. Maruyama’s homeroom takes a class field trip into Banff National Park and finds a waterfall. Recalling Mr. LaDuke’s lessons, they remember that they can use a waterfall to model the flow of electricity. Which of the following would be the best representation of voltage?

• Rocks in the path of the water

• The height of the waterfall

• The amount of water flowing

• The size of the splash at the bottom of the waterfall

Hiking to the top of the waterfall, 9M sees multiple very large boulders. Thinking back on the waterfall analogy once more, they remember that rocks represent …

• Voltage

• Current

• Amperage

• Resistance

Superman recently heard that somebody thought a superconductor was just him dressed in a conductor’s uniform. Seeking to educate the public, he presents them with an example of a superconductor. Which of the following would Superman present?

• A piece of metal in boiling water

• A piece of metal at room temperature

• A piece of metal at -30 °C

• A piece of metal at almost absolute zero temperature

Abdulrahmman wants to power his new chess simulation machine with the most efficient wires possible so he can continue to play chess in class. Which of the following is the best wire to use?

• A wire that is narrow and long

• A wire that is wide and long

• A wire that is narrow and short

• A wire that is wide and short

Recalling her time as an electron in Mr. LaDuke’s demonstration, Rashaa tries to explain what happens to the resistance of a conductor as temperature increases. Which of the following is true?

• As the temperature increases, the resistance decreases

• As the temperature increases, the resistance stays the same

• As the temperature increases, the resistance increases

• As the temperature increases, the resistance changes based on environmental conditions