20)
Why is it important to dispose of wastes from nuclear power plants carefully?
A) The wastes cause the greenhouse effect.
B) The wastes are radioactive and could cause cancer.
C) The wastes do not decompose and take up a lot of space.
D) The wastes flow into ponds and lakes and cause algal bloom.
21)

What is the name of the atom shown?
A) beryllium
B) boron
C) fluorine
D) helium
22)
A cup of coffee sits on the dashboard of an automobile. The car goes around a sharp curve. Even though you hold the cup still, coffee still splashes out.
This can best be explained due to
A) density.
B) friction.
C) gravity.
D) inertia.
23)

The compound formed has a(n) bond and is a(n) .
A) ionic; crystalline solid
B) covalent; amorphous solid
C) metallic; crystalline solid
D) covalent; crystalline solid
24)

Where should the property "little voltage loss across long distances" be placed in the Venn Diagram?
A) direct current
B) alternating current
C) both alternating and direct current
D) neither alternating nor direct current
25)
Time (min) Can without insulator (oC) Can wrapped with paper towel (oC) Can wrapped with bubble wrap (oC)
0 85 85 85
2 80 82 84
4 75 79 84
6 70 77 82
8 65 74 81

A group of students were testing different insulators. They used three metal cans, one wrapped with bubble wrap, a second with a paper towel, and third unwrapped. Equal amounts of hot water were poured into each can and the temperature was noted at definite time intervals. The data is shown in the table.
From the data, they concluded that bubble wrap was the best insulating material. What is the weakness in the conclusion?
A) It is the better of two insulators only; it is not the best insulator.
B) The experiment should have been continued till the temperatures of the cans reached 0°C.
C) The experiment must be repeated at least three times before this conclusion can be drawn.
D) The data on the can without insulator is irrelevant and distracts from the main idea of the experiment.
26)
Which statement is true about a liquid but not a gas?
A) It has more internal energy than the solid state.
B) It will change shape and take the shape of its container.
C) It allows particle to move past each other relatively easily.
D) It has close to a constant volume as pressure is applied to it.
27)
are exchanged or shared during the formation of a chemical bond.
A) Orbitals
B) Sublevels
C) Valence electrons
D) Subatomic particles
28)
A rock is whirled around in a circle with a slingshot. As the rock leaves the slingshot, it has an instantaneous velocity in a straight line. How do Newton's laws of motion explain this?
A) Gravity does not exert a force on the rock until it leaves the slingshot.
B) Once the slingshot is not exerting a force on the rock it will slow down and stop.
C) Air resistance keeps the rock from moving in a circle after it leaves the slingshot.
D) To move in a circle requires an acceleration and therefore a net force. This force is supplied by the slingshot.
29)

The Doppler effect is an effect produced by a moving source of sound or electromagnetic waves due to the relative motion of a source or a receiver. If an emergency vehicle approaches Bob and moves away from Jill, how does the frequency of the siren change?
A) Neither Bob or Jill perceive any change in the frequency of the siren.
B) As an emergency vehicle approaches Bob the frequency appears to increase.
C) As an emergency vehicle moves away from Jill the frequency appears to increase.
D) Bob does not notice any change until the vehicle passes him and the siren increases.
30)
A compound containing sodium and chlorine, in a binary ionic compound, would be named
A) sodium chlorine.
B) sodium chloride.
C) sodium chlorate.
D) sodiide chlorine.