ET_WK14

What type of change alters the structure of a substance?

• material

• chemical

• mechanical

• arrangeal

Which is an example of a physical change?

• a nuclear reaction to make electricity

• Dissolving sugar in water
• Burning wood to ash
• cutting paper

What subset type of properties are tested by applying a force?

• Chemical properties
• Electrical properties
• Mechanical properties
• Thermal properties

What is density?

• Density is the temperature of a substance.
• Density is the volume of an object divided by its mass.
• Density is mass (or amount of stuff) per unit volume.

• Density is the weight of an object.

What type of property is magnetism?

• A chemical property
• A biological property
• A physical/ material property

• An electrical property

A simple electric generator is

• A device that converts mechanical energy to electrical energy, or a backwards motor.

• A device that stores electrical energy and will release it when it senses a drop in voltage longer than 2 seconds.

• A machine that converts electrical energy to mechanical energy or another name for an engine.

• A tool used for measuring electrical current and voltage

If you increase the number of coils (represented by N) in a simple generator, what happens to the electric?

• The electric output increases.
• The electric output becomes unstable.
• The electric output remains the same.
• The mechanical energy decreases.

PICK 3: What are the basic components of a nuclear reactor core?

• control rods

• Turbine generator
• moderator

• Fuel

What is used for a moderator in most cores?

• Water
• Boron
• Graphite
• Helium

How are steady rates of energy production maintained in nuclear reactors?

• Using only uranium fuel without any control mechanisms.
• Increasing the temperature to boost energy output by using permanent magnets.

• Relying solely on natural convection for cooling.
• Raising and lowering control rods and coolant systems to regulate fission and heat removal.