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The abbreviation of the unit of resistance is
For a compound composed of ions, the smallest combination of ions that gives the
formula of the compound is called a
A) molecule.
B) polyionic atom.
C) polyatomic ion.
D) formula unit.
For the multiplication of 3.799 m divided by 4.9 m, the result should be reported with
how many significant figures?
A) Two
B) One
C) Three
D) Four
E) Seven
The magnitude of the acceleration of an object moving in a circle at constant speed is
A) variable.
B) directly proportional to the speed squared.
C) directly proportional to the speed.
D) directly proportional to the radius of the circle squared.
A comet consists of
A) a nucleus only.
B) a coma only.
C) a tail only.
D) all of these.
When an 6-kg object increases its potential energy by 540 J, approximately how has its
position changed?
A) It has risen vertically 9 m.
B) It has fallen vertically 9 m.
C) It has risen vertically 90 m.
D) It has moved horizontally 90 m.
At the time of the summer solstice, in the United States,
A) the number of hours of daylight is greater than the number of hours of darkness.
B) the number of hours of daylight is equal to the number of hours of darkness.
C) the number of hours of daylight is less than the number of hours of darkness.
D) none of the above is true.
If it is 1:00 P.M. EST in Washington, D.C., what is the time in Denver, Colorado, the
longitude of which is 30 more westerly?
A) 9:00 A.M.MST
B) 11:00 A.M. MST
C) 3:00 P.M. MST
D) Noon. MST
The formula mass of Na2S is
A) 55.1 u.
B) 30.1 u.
C) 78.1 u.
D) 57.1 u.
If a compound is solid, has a high melting point, conducts electricity in the liquid phase,
and dissolves in water, it is most likely to be a(n)______________ compound.
A) intermediate
B) organic
C) covalent
D) ionic
Hydrocarbons containing only single bonds are
A) alkanes.
B) alkenes.
C) aromatics.
D) alkynes.
E) ketones.
Which of the following is not a main agent of erosion?
A) Permafrost
B) Ice
C) Wind
D) Streams
derives its name from
A) what it does.
B) when it arrives.
C) how strong it is.
D) how weak it is.
What is the name of the earthquake scale that describes the severity of an earthquake by
noting the amount of damage it causes?
A) Richter scale
B) Mohs scale
C) Torino scale
D) Modified Mercalli scale.
A common feature of coastal erosion is a
A) spit.
B) guyot.
C) seamount.
D) sea arch.
A solution with a pH of 8 is
A) strongly acidic.
B) weakly basic.
C) strongly basic.
D) weakly acidic.
Some food costs may rise in the future as a consequence of the increased use of which
food-based fuel?
A) Ethanol
B) Gasoline
C) Oil
D) Coal
The modification of the standard Big Bang theory is known as the
A) cosmic model.
B) Hubble-Leavitt model.
C) inflationary model.
D) Hertzsprung-Russell model.
The four seasonsspring, summer, fall, and winterare caused by the Sun's changing its
daily altitude over a period of 1 year. The Sun's altitude changes
A) simply because Earth revolves eastward about the Sun.
B) simply because Earth rotates on its axis.
C) simply because Earth's axis is tilted 23.5 from the normal to the ecliptic plane.
D) because of the combined effects of (A) and (C).
How many constellations encompass the complete celestial sphere?
A) 88
B) 360
C) 180
D) 100
When a hydrogen electron is in its first excited state, its principal quantum number is
A) zero.
B) 2.
C) "13.60 eV.
D) 1.
The structural region of Earth that is a viscous liquid is the
A) mantle.
B) outer core.
C) inner core.
D) lithosphere.
The angular measure in degrees north or south of the celestial equator is called
_______________.
A) declination
B) azmuth
C) altitude
D) latitude
The force required to move a 50.0 kg object in a 55.0 m circle at a constant speed of
2.60 m/s is
A) 0.0 N
B) 6.1 N
C) 0.12 N
D) 2.36 N
The reaction is an example of
A) alpha emission.
B) naturally occurring neutron decay.
C) fusion.
D) fission.
The Triassic period is part of which era?
A) Cenozoic
B) Mesozoic
C) Paleozoic
D) Jurrasic
A Doppler red shift indicates
A) a shift toward higher frequencies.
B) a shift toward shorter wavelengths.
C) that a light source is approaching relative to the observer.
D) none of these.
Beneath Earth's lithosphere is a semimolten layer known as the
A) divergent boundary.
B) asthenosphere.
C) batholith.
D) flood basalt.
The fraction of incident light that a body reflects is known as its
A) Rayleigh scattering.
B) insolation.
C) albedo.
D) humidity.
Which of these colors of light has photons of lowestenergy?
A) Blue
B) Green
C) Yellow
D) Violet
The tail of a comet is shortest when the comet is
A) closest to the Sun.
B) farthest from the Sun.
C) closest to Earth.
D) farthest from Earth.
The physical disintegration and chemical decomposition of rock at or near Earth's
surface is called
A) the disintegration chain.
B) erosion.
C) the decomposition cycle.
D) weathering.
The element that is most abundant in Earth's crust is
A) silicon.
B) iron.
C) oxygen.
D) nitrogen.
Which has more volume, a liter or a quart?
A) A liter
B) A quart
C) Both are the same
D) Neither describes volume
A phenomenon that occurs in the ionosphere is
A) the greenhouse effect.
B) photosynthesis.
C) Rayleigh scattering.
D) auroras.
The lithospheric plates are believed to be put into motion by the driving force of
______________ cells in the asthenosphere.
The ______________ of a compound is the sum of the atomic masses given in the
formula of the compound.
Vertical air movements are referred to as ______________.
The rings of Saturn were discovered by ______________.
Radio waves are reflected by layers in the ______________.
When a meteoroid enters Earth's atmosphere, it is called a(n) ______________.
Sound is a(n) ______________ wave.
A(n) __________ is manifested by the vibrating and sometimes violent movement of
Earth's surface.
In the electron cloud model, or quantum model, of the atom, the focus is on the
______________ nature of the electron.
Another name for quantum mechanics is ______________ mechanics.
The pseudoscience called _______________ contends that the planets' positions in the
sky at the time of a person's birth affect the individual's personality or future.
Comets are composed of ______________ and ______________.
The K-T event occurred about ______________ million years ago.
In the metric system, a penny might be called a(n) __________ dollar.
Forces always occur in ____________.
If the decimal point is shifted to the left in a number expressed in powers-of-10
notation, the exponent, or power of 10, is ______________.
During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash
and the sound of the thunder. What is the approximate distance, in miles, from the
observer to the lightning?
To prevent a home electric circuit from overheating because of too much current, a(n)
______________ is used.
