The following statement describes which subatomic particle best?
It is electrically charged.
A) an electron
B) a proton
C) a neutron
D) A and B
E) B and C
Answer:
The source of electrons lighting an incandescent ac light bulb is
A) the power company.
B) the electric outlet.
C) atoms in the light-bulb filament.
D) the wire leading to the lamp.
E) the source voltage.
Answer:
The concept of a chemical bond is
A) how two or more atoms are held together.
B) the sharing of nucleons.
C) how two or more electrons reside in an orbital.
D) how much energy it takes to remove an electron from a set of atoms.
E) none of the above
Answer:
A photovoltaic cell receives energy input primarily by
A) conduction.
B) convection.
C) radiation.
D) all of the above
Answer:
Why does a battery that has thick zinc walls last longer than one that has thin zinc
walls?
A) Thick zinc walls prevent the battery from over heating.
B) Thicker zinc walls prevent electrons from being lost into the surrounding
environment.
C) Thicker zinc walls last longer at holding in the battery acid.
D) The zinc walls are transformed into zinc ions as the battery provides electricity.
Answer:
The reason we don’t have solar and lunar eclipses monthly is because of the
A) relatively close distance of the Moon and Earth.
B) relatively long distance to the Sun.
C) tapering of the Sun’s rays.
D) different orbital planes for Earth and the Moon.
E) 23 tilt of the Earth’s axis.
Answer:
Which of the following is the main form of intermolecular attractions among water
molecules?
A) hydrogen bonding
B) induced dipole-induced dipole
C) covalent bonding
D) ion-dipole
E) polar-induced polar
Answer:
The mineral gold (Au) is very soft. Gold’s softness can be attributed to
A) large, tightly packed atoms.
B) small, loosely bonded atoms.
C) large, loosely packed, and loosely bonded atoms.
D) large, closely packed, and strong bonded atoms.
Answer:
Which requires more energy?
A) melting a gram of 0C ice
B) increasing the temperature of 1 gram of water from 0C to 100C
C) changing 1 gram of 100C water to 100C steam
D) all the same
Answer:
The electric power of a lamp that carries 2 A at 120 V is
A) 1/6 W.
B) 2 W.
C) 60 W.
D) 20 W.
E) 240 W.
Answer:
The energy source for a generator may be
A) a waterfall.
B) steam from a turbine.
C) wind.
D) any of these
E) none of the above
Answer:
When you push an object a certain distance while applying twice the force, you do
A) twice as much work.
B) four times as much work.
C) the same amount of work.
Answer:
An amine can often form R-NH3
+ (where R- can stand for anything) by reacting with
water. What is happening?
A) The amine is accepting a proton from the water molecule, forming OH–.
B) Amines are basic.
C) Amines are acidic.
D) Amines can form H3O+ in water by donating a proton from the polar portion of the
molecule.
E) none of the above
Answer:
If an object’s mass is decreasing while a constant force is applied to the object, the
acceleration
A) decreases.
B) increases.
C) remains the same.
Answer:
Some people fear drinking distilled water because they have heard it leaches minerals
from the body. What scientifically sound information might be offered to such a
person?
A) add small amounts of salt to the distilled water before drinking it
B) chill the distilled water to decrease its leaching potential
C) buy distilled water that has also undergone reverse osmosis
D) Distilled water is relatively pure water, which loses its purity once it mixes with
everything else in your stomach.
Answer:
The voltage across a 10-ohm resistor carrying a current of 5 A is
A) 2 V.
B) 5 V.
C) 10 V.
D) 20 V.
E) more than 20 V.
Answer:
If one of the caissons of the Falkirk Wheel contained a sunken boat, resting on its
bottom, and the other carried a floating boat, the wheel balance would
A) still be maintained.
B) be upset and more energy would be needed for operation.
C) render the machine useless.
D) violate Archimedes’ principle.
Answer:
As ice is changed to water, energy is
A) given to the ice.
B) taken from the ice.
C) neither of these
Answer:
Space and time are
A) bound together.
B) independent entities.
Answer:
Lightning occurs as
A) water droplets in a cloud interact with one another, making the cloud electrically
charged.
B) electrical energy flows from a cloud to the ground.
C) the surrounding air expands.
D) electric energy flow from cloud to ground as interaction of water droplets
electrically charge the cloud.
Answer:
Which emits radiation of the highest frequency?
A) a red-hot star
B) the Sun
C) a blue-hot star
D) all the same
Answer:
The greater efficiency achieved with the curved blades of a Pelton wheel is due to
A) bouncing.
B) greater time of water impact.
C) rotational momentum.
D) divided impulse.
Answer:
If a neutral element has the following chemical notation, how many electrons does it
have?
fluorine-19
A) 9
B) 10
C) 11
D) 19
E) none of the above
Answer:
A chemical change involves the formation or breaking of
A) an atom.
B) the phase of the material.
C) a chemical bond.
D) all of the above
Answer:
The following statement describes which subatomic particle best?
It has a relatively large mass.
A) an electron
B) a proton
C) a neutron
D) A and B
E) B and C
Answer:
Which of the following is characteristic of mountain stream valleys?
A) They are curvy and slow moving.
B) They are V-shaped and have rapids.
C) They have deltas.
D) They are deep and wide.
Answer:
Given the following energy profiles, which of the following reactions is endothermic?
R= reactants P = products
A) a
B) b
C) c
D) d
E) none of the above
Answer:
A rock’s initial melting temperature is primarily determined by
A) the rocks mineralogy.
B) its water content.
C) its internal temperature.
D) its heat source.
Answer:
Which of the following does not describe a neutron?
A) It has a positive charge equivalent but opposite of an electron’s.
B) It is much more massive than an electron.
C) It is a nucleon.
D) It is often associated with protons.
E) It is more difficult to detect than a proton or an electron.
Answer:
Convection in the mantle is caused primarily by
A) heat moving from the crust to the core.
B) conduction.
C) gravity and temperature differences.
D) friction of overlying lithosphere.
Answer:
During the summer months, the Gulf of Mexico is generally
A) cool along the coast.
B) very hot and very humid.
C) hot and dry.
D) none of the above
Answer:
In a battery, the following two oxidation-reduction reactions are taking place:
rxn A: Zn + 2 OH– → ZnO + H2O + 2e–
rxn B: 2 MnO2 + H2O + 2e– → Mn2O3 + 2 OH–
What is undergoing oxidation?
A) Zn
B) ZnO
C) MnO2
D) H2O
E) OH–
Answer:
Air pressure decreases with
A) increasing height.
B) increasing humidity.
C) increasing temperature.
D) increasing density.
Answer:
If you mix a typical aluminum ion (Al, atomic no. = 13) with a typical oxygen ion (O,
atomic no. = 8), what compound is formed?
A) Al2O3
B) Al3O2
C) Al13O8
D) Al3O
E) Al2O2
Answer:
What happens if you were to place a dilute solution that is in a bag made of a
semipermeable membrane and were to then suspend it in a very concentrated solution?
A) The size of the suspended bag would decrease.
B) The size of the suspended bag would increase.
C) The size of the bag would not change.
D) The solutions would eventually reach the same concentration.
E) only c and d
Answer: