Question 1: The electric field is defined as the:

Select one:

force a large positive charge would experience.
force a large negative charge would experience.
force a small positive charge would experience.
force a small negative charge would experience.
force a charge of +1 C would experience.
force a charge of -1 C would experience.

Question 2: The general type of radiation that is emitted when any nuclear particle or any atomic electron moves from one quantized energy level to a lower quantized level is:

Select one:
a positron.
a positive beta particle.
a negative beta particle.
an alpha particle.
electromagnetic radiation.

Question 3: The electron has the same rest mass as the:

Select one: proton
positron
neutron
alpha particle
gamma-ray

Question 4:

Which expression regarding nucleon numbers is correct?

Select one:

Z=N-A
N = Z - A
A=N+Z
N = Z + A
Z=N+A
A = N - Z

Question 5: In which element are the inner shell electrons more tightly bound to the nucleus?

Select one:

mercury (Z = 80)
tungsten (Z = 74)
chromium (Z = 24)
lead (Z = 82)

Question 6: It is common for individual atoms to come together to form molecules in preference to remaining as separate a Hydrogen gas. H2. is a good example. The reason for this is that:

Select one:
The total energy of the molecule is less than that of each of the separate atoms.
The total energy of the molecule is less than that of the two separate atoms.
The total energy of the molecule is greater than that of each of the separate atoms. The total energy of the molecule is greater than that of the two separate atoms.

Question 7:

A solid material will be a good conductor of electricity if:
Select one:
it is ionically bonded with many displaced electrons.
it is covalently bonded with some impurity atoms present.
it is crystalline.
it is bonded in such a way that free electrons are produced.

Question 8:

The chemical properties of a given element are most dependent upon:

Select one:
the structure of the nucleus.
the number of protons in the nucleus.
the ease with which an atom can be ionised. the electronic arrangement of the atom.

Queshon 9:

The activity of a radioactive material at some point in time is:

Select one:
the number of radioactive nuclei present at that time.
half the number of radioactive nuclei present at that time. the number of decay events per second at that time.
half the number of decay events per second at that time.
the number of permanently radioactive nuclei in the material.

Question 10:

The voltage across a 20Ω resistor is measured to be 100 mV. The current through the resistor is:

Select one:
a. 50 A
b. 5.0 A
c. 0.5 A
d. 0.05 A
e. 0.005 A

Question 11: Nuclear magnetic moments in an applied magnetic field precess. What does the term precess, or precession, mean? The moments:
Select one:
a. align parallel to the applied field
b. align anti-parallel to the applied field
c. align at right angles to the applied field
d. wobble' in a circular fashion about the applied field direction

Question 12:

A semi-conductor material normally has the following properties:
Select one:
it is ionically bonded with many displaced electrons available. it is covalently bonded with some impurity atoms present.
it is crystalline.
it is bonded in such a way that free electrons are produced.

Question 13: At some instant of time, to, the number of radioactive nuclei is measured to be No. If after 60 seconds the numt radioactive nuclei is measured to be No/8. what is the half-life of the matenal?

Select one:

180 seconds
120 seconds
60 seconds
30 seconds
20 seconds

Question 14: Which one of the following is not normally considered to be a form of bonding between atoms or ions?
Select one:

Nuclear.
Ionic
Covalent
Metallic

Question 15: Isotopes of a particular element have:
Select one:

different numbers of e'ectrons.
the same number of protons, but the number of neutrons may vary.
the same number of neutrons, but the number of protons may vary.
the same number of nucleons.
the same number of electrons and neutrons.

Question 16:

There are 4 electronic quantum numbers. n. I, m_I, and m_s. Which one of them has no relation to a class electronic motion?

Select one.

• n
• I
• m_I
• m_s

Question 17: The Principal Quantum Number, n:

Select one:
describes the three dimensional shape of an orbital
describes the configuration of the orbitals according to a set of axes In three dimensio describes the direction the electron spins
determines the size and energy level of the orbital
none of the above

Question 18: A crystalline material is one where:

Select one:

• the structural bonding is entirely ionic.
• the structural bonding is entirely covalent.
• the structural bonding is entirely metallic.
• the structure of atoms or molecules is very regular in 3-dimensions.
• the structure of atoms or molecules is very irregular in 3-dimensions.

Question 19: The binding energy of a nucleus is the total energy required to:

Select one:

• well separate the atomic electrons.
• well separate the electrons from the nucleus.
• well separate the protons from the neutrons.
• well separate all the nucleons.

Question 20:

If the activity of a sample of ^99mT_c (T1/2 = 6 hours) is 800 MBq at 4 am, what is its activity at 10 pm on the same day
Select one:
600 MBq
400 MBq
200 MBq
100 MBq

Question 21:

Which one statement is incorrect? A neutral atom, other than the hydrogen atom, always has: Select one:
the same number of neutrons and protons in the nucleus.
at least one neutron in the nucleus.
m the same number of protons and electrons.
at least one proton in the nucleus.

Question 22:

The potassium ion, k⁺, would prefer to have one additional electron, while the chlorine ion. Cl^-, has one excess electron. They come together to form the stable salt KCI through what type of bonding?

Select one:

Nuclear
Ionic
Covalent
Metallic

Question 23:

What is the relationship between the pressure and the temperature of the gas? Select one:

directly proportional
inversely proportional
constant
reciprocal relationship
no relationship

Question 24:

Alpha decay is a form of radioactive decay where:
Select one:
a positron is emitted from the nucleus.
a proton is emitted from the nucleus.
an electron is emitted from the nucleus.
a particle equivalent to the He nucleus is emitted from the nucleus.

Question 25:

Oxygen has the atomic number 8. There are a few isotopes of oxygen, including 0-15 and 0-16. Here the number and 16 tell us the number of:

Select one:

protons in the nucleus.
neutrons in the nucleus.
both neutrons and protons together in the nucleus.
electrons orbiting about the atom.

Question 26: A semiconductor is doped with a small amount of boron. This means that:

Select one:

It is negatively charged, and so will conduct electricity more easily
It is positively charged, and so will conduct electricity more easily
It is neutral, but has more electrons available for conduction
It is neutral, but has more holes available for conduction