Water is 88.88 percent oxygen by mass. Oxygen is exactly what a fire needs to grow
brighter and stronger. So why doesn’t a fire grow brighter and stronger when water is
added to it?
A) Oxygen in water is already “reduced” from the hydrogen atoms, so this oxygen atom
no longer has a great attraction for additional electrons.
B) The oxygen is chemically bound to hydrogen atoms.
C) Oxygen in water is completely different from oxygen , which is what is required
for combustion.
D) all of the above
Answer:
If it takes energy to break bonds and you gain energy in the formation of bonds, how
can some reactions be exothermic while others are endothermic?
A) It is the total amount of energy that matters. Sometimes some bonds are stronger
than others and so you gain or lose energy when you form them.
B) It is the total number of bonds that matters. Sometimes you create more bonds than
you break and since all bonds have same amount of energy you gain or lose energy
depending on the number of bonds.
C) Some reactants have more energetic bonds than others and they will always release
energy.
D) Some products have more energy than others and they always require energy to be
formed.
E) none of the above
Answer:
The electric current in a copper wire is normally composed of
A) electrons.
B) protons.
C) ions.
D) all of the above
Answer:
If a magnet produces a force on a current-carrying wire, the wire
A) produces a force on the magnet.
B) may or may not produce a force on the magnet.
C) neither of these
Answer:
Two charged particles 1 m apart exert a 1-N force on each other. If the particles are
instead 0.5 m apart, the force on each particle will be
A) 1.0 N.
B) 2.0 N.
C) 4.0 N.
D) 8.0 N.
E) 16.0 N.
Answer:
The voltage across the input terminals of a transformer is 110 V. The primary coil has
50 loops and the secondary coil has 100 loops. The output is
A) 25 V.
B) 55 V.
C) 110 V.
D) 220 V.
E) none of the above
Answer:
Metamorphism caused by the alteration of rock by both thermal and mechanical means
is called
A) contact metamorphism.
B) dynamic metamorphism.
C) regional metamorphism.
D) none of the above
Answer:
A seismograph
A) predicts earthquakes.
B) measures ground movement.
C) helps prevent earthquakes.
D) measures fault displacement.
Answer:
What is the main technical difficulty in dealing with fusion reactions?
A) The amount of energy needed to overcome the electrical repulsion of the reactants is
extremely high.
B) The reactants are highly toxic and extremely radioactive.
C) The mass of the reactants is less than the mass of the products.
D) It isn’t possible to artificially generate the conditions needed for fusion.
E) none of the above
Answer:
As a swimmer dives deeper and deeper, strictly speaking, the volume of water displaced
by the swimmer actually
A) decreases.
B) increases.
C) remains unchanged but pressure on her increases
D) none of the above
Answer:
The theory of continental drift is attributed to
A) H.H. Hess.
B) Alfred Wegener.
C) W. Loma Prieta.
D) Simon Tectonic.
Answer:
The reflection of sound is
A) reverberation.
B) an echo.
C) a rare occurrence.
Answer:
In a battery, the following two oxidation-reduction reactions are taking place:
rxn A: Zn → Zn+2 + 2e–
rxn B: 2 NH4
+ + 2e– → 2 NH3 + H2
Which reaction is taking place at the cathode?
A) rxn A
B) rxn B
C) Both reactions are happening at both the anode and cathode.
D) Both reactions are happening are happening at the electrode.
E) The reaction takes place at the electrode, not the cathode.
Answer:
Which has the most atoms?
A) a mole of gold
B) a mole of helium
C) a mole of lead
D) All of the above have the same number of atoms.
E) none of the above
Answer:
Electromagnetic induction is employed in
A) credit card readers.
B) computers.
C) mobile phones.
D) all of the above
E) none of the above
Answer:
A 3000-N bear grasping a vertical tree slides down at constant velocity. The friction
force between the tree and the bear is
A) 30 N.
B) 300 N.
C) 3000 N.
D) more than 3000 N.
Answer:
Metamorphic rock that is weathered and broken down into small pieces can become
A) igneous rock.
B) recrystallized.
C) sediments which can then become sedimentary rock.
D) fossilized.
Answer:
Which of the following statements describes a polar molecule?
A) The electrons in the molecule are distributed evenly throughout the molecule.
B) The molecules are usually not attracted to one another very strongly.
C) Polar molecules have the weakest intermolecular interactions with ionic compounds.
D) The molecules have a high degree of symmetry.
E) None of these statements describe polar molecules.
Answer:
Elements above uranium in the periodic table do not exist in any appreciable amounts
in nature because they have short half-lives. Yet there are several elements below
uranium in atomic number with equally short half-lives that do exist in appreciable
amounts in nature. How can you account for this?
A) These are isotopes formed by living bodies.
B) These isotopes were placed in nature by the testing of nuclear bombs.
C) These isotopes were formed from the fusion of even smaller isotopes.
D) These isotopes result from the radioactive decay of uranium.
Answer:
A friend produces a Geiger counter to check the local background radiation. It ticks.
Another friend, who normally fears most that which is understood least, makes an effort
to keep away from the region of the Geiger counter and looks to you for advice. What
do you say?
A) Run away as fast as you can!
B) The Geiger counter is emitting radiation.
C) The Geiger counter is detecting naturally occurring radiation from your body.
D) Wear heavy clothes.
Answer:
How is it possible for a neutral molecule, such as water, to form an ion?
A) It can combine with a hydrogen ion to form a positively charged species.
B) It can combine with a chloride ion to form a negatively charged species.
C) It can fragment into protons and electrons.
D) It can absorb electrons and become negatively charged.
E) It can absorb electrons and become positively charged.
Answer:
Which of the following images could describe an element at the atomic level?
A)
B)
C)
D) none of the images
E) all of the images
Answer:
As air temperature decreases, relative humidity
A) increases.
B) decreases.
C) stays the same.
D) becomes colder.
Answer:
When the hydronium ion concentration equals 10 moles per liter, what is the pH of the
solution? Is the solution acidic or basic?
A) pH = 0, this is an acidic solution.
B) pH = 1, this is an acidic solution.
C) pH = -1, this is an acidic solution.
D) pH = 7, this is a neutral solution.
Answer:
A mass suspended from a spring bobs up and down one complete cycle every 2 s. Its
period is
A) 0.5 s.
B) 1 s.
C) 2 s.
D) none of the above
Answer:
An example of basic research is
A) the development of new plastics that can be recycled.
B) the study of the relationship between the amount of automobile emissions gases in
the atmosphere and the decomposition of atmospheric ozone.
C) the study of the composition of the atom.
D) the design of new batteries for electric cars.
E) the study of natural compounds in sea animals to look for new molecules that can be
used for medicine.
Answer:
Stream velocity is dependent on
A) the size and shape of the stream’s channel.
B) the gradient and stream dimension.
C) gradient and friction.
D) gradient, channel geometry, and discharge.
Answer:
How is most of the energy required for secondary wastewater treatment consumed?
A) as electricity to power air pumps for aeration
B) as electricity to illuminate UV lamps
C) as heat to run distillation equipment
D) as electricity to power hydraulic pumps for reverse osmosis
E) none of the above
Answer:
For the following reaction, identify whether the compound in bold is behaving as an
acid or a base.
H3PO4 + H2O H⇌2PO4
– + H3O+
A) acid
B) base
C) neither
D) both
E) none of the above
Answer:
If you wish to send a beam of laser light from Earth to a space station above the
atmosphere near the horizon, aim your laser
A) above your line of sight.
B) below your line of sight.
C) along your line of sight.
Answer:
If you filter sea water to remove all of the particles you would be left with a clear
A) homogeneous mixture called a solution.
B) homogeneous mixture called a suspension.
C) heterogeneous mixture called a solution.
D) heterogeneous mixture called a suspension.
E) pure liquid.
Answer:
Reverberation is a case of
A) sound interference.
B) forced vibrations.
C) re-echoed sound.
D) resonance.
E) none of the above
Answer: