Which term best describes Styrofoam?
A. metal mixture
B. raw material
C. nonmetal mixture
D. synthetic material
D. synthetic material
Which statement explains how heat causes materials to expand?
A. Lower temperatures decrease the kinetic energy of the particles, which causes the particles to move less and take up more space.
B. Higher temperatures increase the kinetic energy of the particles, which causes the particles to move more and take up more space.
C. Lower temperatures increase the kinetic energy of the particles, which causes the particles to spread out.
D. Higher temperatures increase the kinetic energy of the particles, which causes the particles to pack closely together.
B. Higher temperatures increase the kinetic energy of the particles, which causes the particles to move more and take up more space.
Which statement about materials used as insulators and conductors is correct?
A. Conductors prevent electricity from transferring between materials.
B. Insulators can have a higher voltage than conductors.
C. Insulators are made to let electrons flow more easily.
D. Conductors allow for more electric current than insulators.
D. Conductors allow for more electric current than insulators.
How does a light bulb function as a resistor?
A. It amplifies or increases the electric current, changing the energy into the light it emits.
B. It passes the electric current through it, changing the energy into light.
C. It functions as a closed loop in which energy passes from one end to the other, producing light along the way.
D. It blocks or decreases the electric current, changing the energy into the light it produces.
D. It blocks or decreases the electric current, changing the energy into the light it produces.
Which material listed would be the best choice as a conductor?
A. gold
B. Styrofoam
C. rubber
D. salt water
A. gold
A contractor selects heavier trusses for a house, increasing the load that the walls must support. Which change will the contractor need to make to the design?
A. increase the thickness of the wall material
B. increase the electrical wiring in the wall
C. increase the amount of insulation in the wall
D. increase the overall weight to the roof