1. The atomic number of an element is equivalent to its ―
A
B
C
D
number
number
number
number
of
of
of
of
valence electrons.
protons and neutrons.
protons.
neutrons.
2. Bohr’s model of the atom proposed that ―
A
B
C
D
electrons move around the nucleus in orbits.
neutrons move around the nucleus.
neutrons do not exist, but are just paired protons and electrons.
the nucleus spins.
Niels Bohr
3. J. J. Thomson’s model of the atom is given this name because he believed
that electrons were spread randomly in the atomic space.
A
B
C
D
plum pudding model
orbital model
Thomson’s model
plasma model
4. Which of the following correctly describes the electron cloud model?
A
B
C
D
Electrons are found in fixed orbitals around a positive nucleus.
Electrons do not follow fixed orbitals, but are more frequently found in certain areas
around the nucleus.
All of the mass of an atom is concentrated in the nucleus.
Electrons are evenly embedded throughout a positively charged sphere.
5. Which of these is not a physical change?
A
B
C
D
iron rusting
boiling water
dissolving salt in water
sawing wood
6. In physical changes, the chemical composition of the substance —
A
B
C
D
changes.
does not change.
becomes more reactive.
becomes unbalanced.
7. Work is done when —
A
B
C
D
enough effort is exerted on an object.
the object on which the force is being applied moves in the direction of the force.
someone exerts a great amount of force on an object.
forces are balanced.
8. Which of the following is NOT a benefit of using nuclear energy?
A
B
C
D
There are no waste products left over.
There is no air pollution generated.
It is a reliable and economical source of energy.
It decreases our dependence on foreign oil.
9. The substances to the left of the arrow in a chemical equation are
called ―
A
B
C
D
subscripts.
reactants.
products.
coefficients.
10. Which of the following is a balanced chemical equation for the following
reaction?
Al+ O2  Al2O3
A
B
C
D
2 Al
Al
4 Al
4 Al
+ 2 O2  2 Al2O3
+ 3 O2  2 Al2O3
+
O2  4 Al2O3
+ 3 O2  2 Al2O3
11. The temperature at which all molecular motion stops is called ―
A
B
C
D
0 degrees Celsius.
absolute zero.
273 degrees Kelvin.
absolute Kelvin.
12. In the winter, salt is often used to melt ice and snow. How does this
process work?
A
B
C
D
The salt is heated by the sun. The heat transfers to the snow and ice, and then
melts them.
Adding salt causes a heat-releasing chemical reaction, which melts the snow and
ice.
Adding the salt lowers the freezing point of water below 0 °C, causing the snow
and ice to melt.
Adding the salt raises the boiling point of water above 0 °C, causing the snow and
ice to melt.
13. What type of heat transfer is present when boiling an egg?
A
B
C
D
convection and radiation
vaporization and conduction
radiation and vaporization
conduction and convection
14. Which of the following is a measure of the average kinetic energy of the
particles in an object?
A
B
C
D
potential energy
thermal energy
temperature
specific heat
15. In which direction does heat move?
A
B
C
D
from lower temperature matter to higher temperature matter
from higher temperature matter to lower temperature matter
from matter at one temperature to other matter at similar temperatures
in a direction to increase the temperature difference between the groups of matter
16. What happens to temperature during a phase change in a substance?
A
B
C
D
It increases.
It decreases.
It can either increase or decrease.
It stays the same.
17. Which of these is not a way in which heat is transferred?
A
B
C
D
conduction
convection
radiation
subduction
18. What is the only type of heat transfer that can take place across a
vacuum?
A
B
C
D
radiation
convection
conduction
No heat transfer can occur through a vacuum.
19. Which of these uses radiation to transfer heat energy?
A
B
C
D
deep fryer
electric grill
steam iron
electric toaster
20. Sound waves are different from water waves because ―
A
B
C
D
water waves are mostly transverse, but sound waves are longitudinal.
sound waves travel in straight lines.
they have different wavelengths.
water waves are higher in frequency.
21. A longitudinal wave is different from a transverse wave
because ―
A
B
C
D
energy is transferred from the wave.
the particles move back and forth, parallel to the path of the wave instead of at
right angles to the path.
energy is lost by the wave.
it has a longer wavelength.
22. What two things affect the speed of sound?
A
B
C
D
the
the
the
the
medium that the sound travels through and the temperature of the medium
distance to the medium that the sound travels through and the size of the wave
temperature and the resonance of the medium that the sound travels through
compression and rarefaction of the sound waves
23. The amount of work done in a period of time is called ―
A
B
C
D
force.
power.
exertion.
impetus.
24. What two quantities does the acceleration of a moving object depend on?
A
B
C
D
the
the
the
the
force and the mass of the object
force and the velocity of the object
friction and the speed of the object
resistance and the momentum of the object
25. Suppose you are at an ice-skating rink. You push a flat smooth object
forward on the ice with your hand and let go of it, so that it can continue
to slide. If the object could slide completely without friction on the ice,
how would it move according to Newton’s Laws of Motion?
A
B
C
D
It
It
It
It
would
would
would
would
curve
curve
move
move
to the left at a constant speed.
to the right at a decreasing speed.
straight ahead at a constant speed.
straight ahead at a decreasing speed.
26. What is the name of the effect of the gravitational force that the Earth
exerts on an object?
A
B
C
D
weight
mass
velocity
acceleration
27. A student lifts a box off the floor, and then walks to the other side of the
room. When does the student do work?
A
B
C
D
when walking across the room
when lifting the box
both when lifting the box and walking
at no time does the student do work
28. Which of these is an example of a compound machine made up of a
wedge and a lever?
A
B
C
D
a see-saw
a screw
an ax
an inclined plane
29. In a series circuit such as the following ―
A
B
C
D
the devices wired to the circuit always go on and off together.
all devices operate at the same voltage.
electrons flow on several paths.
all elements consume the same amount of power.
30. Which can be used as an insulator?
A
B
C
D
silver
plastic
steel
copper
31. An electric current, flowing in a wire, generates what type of field?
A
B
C
D
a gravitational field
a magnetic field
an electrical field
an attraction field
32. Electric current is ―
A
B
C
D
stronger than static electricity.
increased when you increase the voltage.
decreased when you increase the voltage.
a depletion of electrons.
33. A generator is a device that —
A
B
C
D
converts mechanical energy into electrical energy
converts electrical energy into mechanical energy
converts mechanical energy into chemical energy
converts nuclear energy into mechanical energy
34. Which substance contains a covalent bond?
A
B
C
D
KCl
N2
Ca2O
CuBr
35. Suppose a juggler is juggling bowling pins. At the bowling pin’s highest
point, what form of energy does it have?
A
B
C
D
potential energy
kinetic energy
no potential or kinetic energy
equal amounts of both