Basic Physics of Nuclear Medicine/A&Nmcq

Point added for a correct answer:
Points for a wrong answer:
Ignore the questions' coefficients:

1. Electrons are positioned:

	inside the nucleus
	outside the nucleus
→	Correct Answer - see Atomic Structure.
	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
→	Correct Answer - see Classification of Nuclei.
	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
→	Correct Answer - see Atomic Structure.
	water
	neutrons

4. The number of known isotopes is roughly:

	5,000
	2,500
→	Correct Answer - see Radioactivity
	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
→	Correct Answer - see Classification of Nuclei.
	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
→	Correct Answer - see Atomic Structure.

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

	protons equals the number of electrons
→	Correct Answer - see The Nucleus.
	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
→	Correct Answer - see Binding Energy.
	joules
	eV

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

	two neutrons and one proton
→	Correct Answer - see Classification of Nuclei.
	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
→	Correct Answer - see Classification of Nuclei.
	same A, different Z
	Z greater than A

11. Radioactivity is the process of:

	an unstable nucleus becoming stable
→	Correct Answer - see Nuclear Stability.
	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
→	Correct Answer - see Classification of Nuclei.
	X
	M

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

	235
	146
	92
	143
→	Correct Answer - see Classification of Nuclei.

14. The two main parts of an atom are called:

	nucleus and protons
	atom and molecule
	molecule and electron
	none of the above
→	Correct Answer - see Atomic Structure.

15. Which of the following is the smallest?

	a molecule
	an atom
	a nucleus
	an electron
→	Correct Answer - see Atomic Structure.

16. Which one of the following is a nucleon?

	proton
→	Correct Answer - see Atomic Structure.
	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
→	Correct Answer - see Atomic Mass Unit.

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

	the mass number
→	Correct Answer - see Classification of Nuclei.
	the number of electrons
	the atomic number
	Avagadro's number

Your score is 0 / 0