The Design World Unit Test
Connections Academy 8th Grade
Please only use this to check your answers.
1. Plywood is made by gluing together thing layers of wood. Which term best decribes plywood?
A. conductor
B. composite ***
C. natural
D. raw material
2. An engineer is designing a component of a product. The component is responsible for carrying electric current from one part of the product to another. Which material would be a suitable choice for the component?
A. glass
B. rubber
C. plastic
D. copper ***
3. Which term refers to the rate of electricity passing through a circuit?
A. conductivity
B. voltage
C. electron
D. current ***
4. An architect is designing an office building in an are that can experience earthquakes. Which component would it be most important to strengthen in order to allow the building to withstand the additional forces exerted during an earthquake?
A. the doors
B. the foundation ***
C. the electric system
D. the windows
5. When would a transformation of chemical energy to electrical energy occur?
A. when the current becomes zero
B. when there is chemical reaction between metals and nonmetals ***
C. when a reaction produces the same products
D. when electrons stop moving between atoms
6. Which statement is true about the two metals used in batteries?
A. The two metals have opposite charges. ***
B. The two metals are the same.
C. The two metals not reactive to chemicals inside the battery.
D. The two metals restrict the flow of electrons.
7. Which type of transportation system is best for moving a large amount and wide variety of goods?
A. rail
B. maritime ***
C. road
D. air
8. Which mode of transportation is best for ensuring fastest delivery?
A. rail
B. air ***
C. road
D. maritime
9. How does combustion occur in a gas engine of a car?
A. Carbon dioxide and gasoline are compressed in the engine, and fual spontaneeously ignites. ***
B. Oxygen and gasoline are compressed in the engine, and fual spontaneeously ignites.
C. Oxygen and gasoline are compressed in the engine, and a spark plug ignites the fuel.
D. Carbon dioxide and gasoline are compressed in the engine, and a spark plug ignites the fuel.
10. The gas pedal belongs to which subsystem of an automobile?
A. suspension
B. control ***
C. transmission
D. guidance
11. Why are metals used within most electric devices and wires? In three to five sentences, apply your knowledge of conductivity to explain.
*Your own answer*
12. In three to five sentences, identify two components of the control subsystem of a vehicle, and use them to explain why driving can be hazardous when the control subsystem is not functioning properly.
*Your own answer*
Answers provided by OpenAI language model:
1. B. composite
2. D. copper
3. D. current
4. B. the foundation
5. B. when there is chemical reaction between metals and nonmetals
6. A. The two metals have opposite charges.
7. B. maritime
8. B. air
9. C. Oxygen and gasoline are compressed in the engine, and a spark plug ignites the fuel.
10. B. control
11. Metals are used within most electric devices and wires because they have high electrical conductivity, meaning that they allow electric current to pass through them easily. This property makes them an ideal material for use in electric circuits, where a steady flow of current is required to power devices. Additionally, metals have low resistance, which means that they do not lose much energy in the form of heat as they conduct electrical current. This property helps to ensure that the energy being transmitted through the wires and circuits remains high, which is important for efficient operation of electronic devices and systems.
12. Two components of the control subsystem of a vehicle are the throttle pedal and the brake pedal. These components allow the driver to regulate the speed and direction of the vehicle. If either of these components is not functioning properly, it could result in an accident, since the driver would not be able to control the vehicle as intended. For example, if the brake pedal is not working, the driver would not be able to slow down or stop the vehicle in response to changing road conditions or hazards. Similarly, if the throttle pedal is not working, the driver would not be able to regulate the speed of the vehicle, which could result in a collision.
11. Metals are used within most electric devices and wires because they have high conductivity. Electrical conductivity refers to the ability of a material to allow the flow of electric charge. Metals have a large number of free electrons, which are not tightly bound to the atomic nuclei and can move freely. This property allows metals to easily conduct electric current. In electric devices, metals are used to ensure efficient transmission of electricity throughout the circuit. In wires, metals provide low resistance to the flow of electrons, reducing energy loss as heat and ensuring effective transfer of electrical energy.
12. Two components of the control subsystem of a vehicle are the steering system and the braking system. When the control subsystem is not functioning properly, driving can become hazardous. If the steering system malfunctions, the driver may lose the ability to steer the vehicle properly, leading to a loss of control and the potential for accidents. Similarly, if the braking system fails, the driver may not be able to bring the vehicle to a stop effectively, increasing the risk of collisions. These two components are crucial for the safe operation of a vehicle, and any malfunction or failure can significantly compromise driving safety.