Basic Physics of Nuclear Medicine/Atomic & Nuclear Structure MCQ

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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