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radioactivity

Total questions: 28

Worksheet time: 28mins

Name
Class
Date
1.
An isotope of an element has the same number of _________, but a different number of _________.
a)
Protons, electrons
b)
Protons, neutrons
c)
Electrons, neutrons
2.
What type of radioactive decay is shown here?
a)
Alpha decay
b)
Beta decay
c)
Gamma decay
3.
What particle is released when an unstable isotope undergoes alpha radiation?
a)
an helium nucleus
b)
an electron
c)
a photon of light
4.
Which process involves the splitting of large nuclei?
a)
alpha decay
b)
nuclear fusion
c)
beta decay
d)
nuclear fission
5.
What type of nuclear reaction occurs in the Sun?
a)
Nuclear fission
b)
beta decay
c)
alpha decay
d)
Nuclear fusion
6.
What type of decay is shown here
a)
alpha decay
b)
beta decay
c)
gamma decay
7.
The rate at which a radioactive element decays is its ____.
a)
quarter life
b)
whole life
c)
wonderful life 
d)
half life
8.
Neutrons released in a fission reaction can strike other nuclei and cause a 
a)
meltdown
b)
take down
c)
break down
d)
chain reaction
9.
Name the instrument used to detect radioactivity.
a)
voltmeter
b)
ohmeter
c)
seismograph
d)
geiger counter
10.
What makes something radioactive?
a)
elements with an atomic number above 81
b)
an unstable nucleus
c)
contaminated sewage
d)
It decays over time
11.
If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?
a)
200yrs
b)
100yrs
c)
50yrs
d)
300yrs
12.
What is nuclear fission?
a)
Big nucleus splits to small nuclei
b)
Small nuclei fuse into a bigger nucleus
c)
Stars
d)
Making compounds
13.
How do nuclear power-plants work?
a)
Fusion
b)
Half-life
c)
Fission
d)
Fusion or fission
14.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
15.
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?
a)
16g
b)
32g
c)
0.0625g
d)
4g
16.

Identify the type of nuclear decay shown here

21483Bi → 0-1e + 21484Po

a)

alpha

b)

beta

c)

gamma

17.
Solve this equation for alpha decay.
85209At = ___ + 24He
a)
83205Bi
b)
86209Rn
c)
81207Tl
d)
85208At
18.
Solve this equation for beta decay.
2760Co = ___ + -10e
a)
2556Mn
b)
2860Ni
c)
2358V
d)
2759Co
19.
How do nuclear power-plants work?
a)
Fusion
b)
Half-life
c)
Fission
d)
Fusion or fission
20.
Takes two small nuclei and combines them into a larger nucleus
a)
fission
b)
fusion
21.

Nuclear power plant uses ____ for fuel.

a)

steel

b)

coal

c)

uranium

d)

hydrogen

22.
What controls the reaction within a nuclear reactor?
a)
Control Rods
b)
Moderator
c)
Containment building
d)
Reactor Vessel
23.

Which components of a fission reactor are used to slow neutrons during a fission reaction?

a)

moderators

b)

shields

c)

coolants

d)

control rods

24.

The main function of a coolant in a nuclear fission reactor is to

a)

slow down the speed of the neutrons

b)

absorb energy produced by the reaction

c)

shield the wall of the reactor from radiation damage

d)

adjust the number of neutrons available for reaction

25.

Control rods in nuclear reactors are commonly made of boron and cadmium because these two elements have the ability to

a)

absorb neutrons

b)

emit neutrons

c)

decrease the speed of neutrons

d)

increase the speed of neutrons

26.
What is a chain reaction?
a)
When electrons are emitted causing electricity
b)
When a nuclear fission reaction occurs, the protons emitted can strike other nuclei in the sample, and cause them to split
c)
When a nuclear fission reaction occurs, the neutrons emitted can strike other nuclei in the sample, and cause them to split
d)
When a nuclear fission reaction occurs, the electrons emitted can strike other nuclei in the sample, and cause them to split
27.
What do  control rods do in a nuclear reactor?
a)
Regulate the rate of reaction  by absorbing and slowing neutrons
b)
Produce electricity
c)
Produce neutrons to increase the rate of reaction
d)
Reduce heat produced by the uranium rods
28.

Which parts function is to reduce the energy of fast neutrons to thermal neutrons in nuclear power plant?

a)

Moderator

b)

Coolant circulator

c)

Control rods

d)

Shielding

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