Circle the best answer for each of the following questions.

1		The nuclei of all atoms other than 11H contain
			A)	electrons and protons
			B)	neutrons and protons
			C)	neutrons and electrons
			D)	protons only
2		Rutherford’s experimental procedure, which revealed the structure of the atom, involved
			A)	aiming a beam of x-rays at a block of lead
			B)	aiming neutrons at a mass of fissionable uranium
			C)	aiming a narrow beam of alpha particles at a thin gold foil
			D)	causing collisions of fast-moving electrons with protons and neutrons
3		Rutherford’s experiment revealed that
			A)	atoms are mostly empty space
			B)	all atoms have the same atomic number
			C)	quarks are the building blocks of protons and neutrons
			D)	atoms are electrically neutral
4		At room temperature and normal atmospheric pressure, most elements are
			A)	unstable
			B)	gases
			C)	liquids
			D)	solids
5		The mass number of a nucleus is the number of
			A)	protons in the nucleus
			B)	neutrons in the nucleus
			C)	protons and neutrons in the nucleus
			D)	quarks in the nucleus
6		An electron that has a positive charge is called a
			A)	neutrino
			B)	positron
			C)	hadron
			D)	nuclide
7		The most important single source of the radiation dosage received by an average person in the United States is
			A)	cosmic rays
			B)	radon gas
			C)	x-ray machines
			D)	nuclear reactors
8		One atomic mass unit is approximately equal to the mass of a(n)
			A)	electron
			B)	atom of hydrogen
			C)	alpha particle
			D)	neutrino
9		The energy needed to break a nucleus apart is called its
			A)	energy of fission
			B)	nuclear energy
			C)	binding energy
			D)	separation energy
10		No new nuclear reactors have been ordered in the United States since 1979 because
			A)	the United States is energy self-sufficient and no new reactors are needed
			B)	the United States has run out of uranium
			C)	the United States is waiting until nuclear fusion becomes practical before building new reactors
			D)	of public concerns over safety of nuclear reactors and unfavorable economic conditions
11		Currently, the best method of disposing of nuclear wastes seems to be
			A)	incineration
			B)	underground storage
			C)	ocean dumping
			D)	chemical neutralization
12		Which one of the following is not a requirement for a fusion reactor?
			A)	a moderator of graphite or water
			B)	extremely high temperatures to initiate fusion
			C)	sufficient confinement time for a net energy output
			D)	a high concentration of fuel nuclei
13		During the process of pair production
			A)	matter is converted into energy
			B)	a particle is converted into its antiparticle counterpart
			C)	energy is converted into matter
			D)	an electron decays to form a pair of quarks
14		The fundamental interaction that has yet to be included in a grand unified theory is the
			A)	strong interaction
			B)	electromagnetic interaction
			C)	weak interaction
			D)	gravitational interaction
15		An example of a lepton is the
			A)	electron
			B)	quark
			C)	proton
			D)	neutron