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An earthquake S wave travels through
A) the inner core only.
B) the mantle only.
C) the outer core only.
D) all of these.
Thermonuclear warheads, or hydrogen bombs, are powerful mainly because of the
A) fission process.
B) fusion process.
C) absorption of neutrons by 238U.
D) emission of protons by 238U.
Weather occurs in the
A) stratosphere.
B) troposphere.
C) mesosphere.
D) thermosphere.
Folded rock layers that resemble a trough are called
A) anticlines.
B) inclines.
C) synclines.
D) paraclines.
An automobile travels due north with a speed of 92 km/h that is decreasing. All forces
considered, the unbalanced force acting on the auto is
A) zero.
B) southward.
C) northward.
D) downward.
E) upward.
How many electrons are there in a neutral atom of ?
A) 26
B) 30
C) 82
D) 56
At the end and along the sides of a glacier, the sediment deposits may form ridges
known as
A) moraines.
B) cirque.
C) hills.
D) none of these.
Who, in 1925, postulated that matter, as well as light, has properties of both waves and
particles?
A) Planck
B) Heisenberg
C) de Broglie
D) Einstein
What is the hardness of diamond on the Mohs scale?
A) 1
B) 4
C) 7
D) 10
The complementary angle of the angle of an object above the horizon is the
A) zenith angle.
B) altitude.
C) latitude.
D) noon angle.
Three resistors, 60 , 80 , and 80 , are wired in series and connected to a 120-V
battery. What is the equivalent resistance for this circuit?
A) 220
B) 24
C) 0.042
D) 384000
Seismic waves that propagate through Earth are known as
A) focus waves.
B) surface waves.
C) gravity waves.
D) body waves.
Which of the following radionuclides has the shortest half-life?
A) Potassium-40
B) Uranium-238
C) Carbon-14
D) Uranium-235
To which group of polymers does nylon belong?
A) Natural
B) Hydrolytic
C) Addition
D) Condensation
The planet Earth
A) has retrograde motion.
B) is the closest planet to Venus.
C) is the smallest of the terrestrial planets.
D) has a unique circular orbit.
The term age of mammals is sometimes used to refer to the ______________ era.
When solutions of AgNO3and CaCl2are mixed, which type of reaction is likely?
A) Combination
B) Double-replacement
C) Decomposition
D) Single-replacement
The most abundant gas in the atmosphere is
A) oxygen.
B) nitrogen.
C) water vapor.
D) carbon dioxide.
A hydrocarbon that contains one or more benzene rings must be classified as
A) an alkane.
B) a cycloalkane.
C) aromatic.
D) an alkene.
E) an alkyne.
The region of the electromagnetic spectrum with frequencies just less than those in the
infrared region is the ______________ region.
A) microwaves
B) x-rays
C) gamma rays
D) radio waves
E) ultraviolet
The top of the stratosphere is called the
A) stratopause.
B) tropopause.
C) mesopause.
D) thermopause.
Oak Ridge, Tennessee, was built to separate
A) 235U from 238U.
B) 14C from 12C.
C) 2H from 1H.
D) 239Pu from 238U.
The mass number (A) of a nuclide is equal to the number of ______________ in one of
its nuclei.
A) protons plus neutrons
B) protons
C) neutrons
D) neutrons plus electrons
The "plum pudding model" of the atom is associated with
A) Bohr.
B) Rutherford.
C) Dalton.
D) Thomson.
The symbol for Krypton is
A) Kr.
B) Sr.
C) Br.
D) Se.
E) Rb.
When an electron in an atom falls from a higher energy level to a lower one, a
______________ is ______________.
A) proton; absorbed
B) proton; emitted
C) photon; absorbed
D) photon; emitted
With which object would the wave nature of matter be significant?
A) A hard-thrown baseball
B) A speeding truck
C) A moving electron
D) An orbiting planet
In terms of energy levels of electrons, a potential well has
A) a negative value.
B) a positive or a negative value.
C) a positive value.
D) none of these.
A quantitative observation that is the basis of scientific investigation is a(n)
A) experiment.
B) measurement.
C) explanation.
D) number.
When the Sun moves off the main sequence, it will next become a _______________.
A) red giant
B) dwarf star
C) white dwarf
D) black hole
What is the formula of a compound formed from the ions M3+ and X2-?
A) M2X
B) MX
C) M2X3
D) MX2
The local solar time at 75W is 12:00 noon. What is the longitude of an observer who
sees the full moon on her meridian at this time?
The element ______________ is a purple-black solid that sublimes readily.
A continuous change in position is called ______________.
A hypothesis is a very tentative explanation of some ______________ of nature.
The United States' most abundant fuel supply is ______________.
Kepler's first law of planetary motion is known as the law of ______________ paths.
Isotopes of an element differ in their numbers of ______________.
The number of nucleons in an atom of is ______________.
In a covalent molecule, each atom (except hydrogen) generally has ______________
electrons in its outer shell.
If we restrict the vibrations of the electric field vector of a wave to one direction, the
wave is said to be linearly ______________.
The linear momentum of an object is conserved if there are no ______________ forces
acting on it.
When the Moon is 90 east of the Sun, it will be in the ______________ phase.
The lifetime of a star is determined by its initial _____________.
The unit of electric current is the _____________.
