Basic Physics of Nuclear Medicine/A&Nmcq

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1 Electrons are positioned:

inside the nucleus
outside the nucleus
both inside and outside the nucleus
at all of the above locations

2 Mass Number is defined as:

the number of protons plus the number of neutrons in a nucleus
the number of neutrons in a nucleus
the complement of the Atomic Number
the number of protons in a nucleus

3 An atom can be considered as consisting mostly of:

isotopes
empty space
water
neutrons

4 The number of known isotopes is roughly:

5,000
2,500
1,000
100

5 Atomic Number is defined as:

the inverse of the Mass Number
the number of protons plus the number of neutrons in a nucleus
the number of protons in a nucleus
the number of neutrons in a nucleus

6 The radius of a nucleus is how much smaller than that of an atom:

10 times
100 times
1,000 times
10,000 times

7 For an atom to be electrically neutral, the number of:

protons equals the number of electrons
neutrons equals the number of electrons
protons equals the number of neutrons
protons equals the number of nucleons

8 Nuclear binding energies are usually expressed in units of:

keV
MeV
joules
eV

9 The Hydrogen-3 nucleus (also called Tritium) consists of:

two neutrons and one proton
two protons and one neutron
two neutrons and two protons
two neutrons and no protons

10 Isotopes are nuclei with:

same A and Z
same Z, different A
same A, different Z
Z greater than A

11 Radioactivity is the process of:

an unstable nucleus becoming stable
an electron moving to a higher energy shell
an electron moving to a lower energy shell
a stable nucleus becoming unstable

12 The number of protons in a nucleus is expressed by the symbol:

A
Z
X
M

13 How many neutrons are in a Uranium-235 nucleus?

235
146
92
143

14 The two main parts of an atom are called:

nucleus and protons
atom and molecule
molecule and electron
none of the above

15 Which of the following is the smallest?

a molecule
an atom
a nucleus
an electron

16 Which one of the following is a nucleon?

proton
electron
nucleus
molecule

17 One Atomic Mass Unit is about:

one millionth of a gram
one million, millionth of a gram
one million, million, millionth of a gram
one million, million, million, millionth of a gram

18 In the symbol Cs-137, the number 137 represents:

the mass number
the number of electrons
the atomic number
Avagadro's number