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Radioactivity questions Nov 24

Total questions: 133

Worksheet time: 5hrs 34mins

Name
Class
Date
1.

What is the Half Life of this isotope?

a)

3 days

b)

5 days

c)

8 days

d)

10 days

2.

The Half Life of Californium 252 is 5 years.

a)

TRUE

b)

FALSE

3.

The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

a)

quarter life

b)

whole life

c)

wonderful life

d)

half life

4.

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

5.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
6.

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the sample is left?

a)

1/2

b)

1/3

c)

1/16

d)

1/8

7.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
8.

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 2.4 minutes has elapsed?

a)

100.0g

b)

50.0g

c)

12.5g

d)

8.5g

9.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
10.

If 10 mg of iodine 131 is given to a patient, how much is left after 8 days? The half-life of iodine-131 is 8 days.

a)

5.0mg

b)

1.25g

c)

10g

d)

10mg

11.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
12.

The % of the parent isotope remaining after 3 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

13.

The % of the parent isotope remaining after 1 Half Life.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

14.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

15.

A radioactive sample will lose half of its original radioactive nuclei after 1 half life.

a)

TRUE

b)

FALSE

16.

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 4.8 minutes has elapsed?

a)

100.0g

b)

25.0g

c)

12.5g

d)

8.5g

17.

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

a)

100.0g

b)

25.0g

c)

12.5g

d)

8.5g

18.

If 10 mg of iodine 131 is given to a patient, how much is left after 16 days? The half-life of iodine-131 is 8 days.

a)

5.0mg

b)

2.5mg

c)

10g

d)

10mg

19.

If 10 mg of iodine 131 is given to a patient, how much is left after 27 days? The half-life of iodine-131 is 9 days.

a)

5.0mg

b)

2.5mg

c)

1.25mg

d)

10mg

20.

What is the half life of californium?

a)

1 year

b)

2.8 years

c)

3 years

d)

5 years

21.
A sample of a radioactive isotope has a half-life of 20 seconds. If the initial amount of the isotope is 100 grams, how much will be left after 60 seconds?
a)
A. 6.25 grams
b)
B. 12.5 grams
c)
C. 25 grams
d)
D. 50 grams
e)
E. 75 grams
22.
The half-life of a radioactive isotope is 30 seconds. What percentage of the original sample remains after 90 seconds?
a)
A. 12.5%
b)
B. 25%
c)
C. 37.5%
d)
D. 50%
e)
E. 62.5%
23.

The half life is the (a)   it takes for the amount of radioactive (b)   to halve.

OR

The half life is the ​ (c)   it takes for the radioactive (d)   to halve.

Choose from the below words
time
nuclei
count rate
atoms
length
alpha
bequerels
becquerels
24.

What is the correct unit for radioactivity

a)

Newtons

b)

Chernobyls

c)

Becquerels

d)

Geigers

25.

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

26.

The Half Life of Californium 252 is 5 years.

a)

TRUE

b)

FALSE

27.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
28.

Select all the correct definitions for half life

a)

The time taken for the number of radioactive nuclei in a sample to reduce by half.

b)

The time taken for the activity of a sample to reduce by half.

c)

The activity of a sample after half of it has decayed.

d)

The number of radioactive nucei after half of them have decayed.

e)

The time taken for half of each radioactive nuclei to decay.

29.

Give your answer to the nearest 0.1 days.


Give your answer as a number, without units.

(a)  

30.

Uranium 238 has a half life of 4500 million years. When the Earth was formed there was twice as much Uranium in rocks as there is now. What is the age of the Earth in millions of years?

(a)   million years.

Write down the number only.

31.

Give your answer in years, to the nearest whole year, with no unit.

(a)  

32.

Give your answer in hours , to the nearest whole hour, with no unit.

(a)  

33.

Give your answer in hours, to one decimal point.

(a)  

34.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

35.

Which of these is a use of alpha radiation?

a)

Sterilising food

b)

Smoke detectors

c)

Monitoring paper thickness

d)

Industrial tracers

36.
For which of the following problems would a scientist most likely use carbon-14? 
a)
to calculate the age of the Earth's oldest rocks
b)
to calculate the age of a piece of bone 
c)
to identify the elements that make up a rock 
d)
to identify the elements that make up a bone
37.
Radioactive tracers are useful in ____.
a)
calculating the ages of fossils 
b)
fueling nuclear reactions 
c)
determining medical problems 
d)
treating brain tumors 
38.

Suggest way that a scientist can protect themselves against exposure when handling radioactive sources.

a)

Storing sources in a lead–lined box using tongs

b)

Goggles and gloves

c)

Tie hair back

39.

Which of these is a use of beta radiation?

a)

Sterilising food

b)

Smoke detectors

c)

Monitoring metal sheet thickness

d)

Industrial tracers

40.

Radioactivity can be harmful and cause disease because it affects _________.

a)

air

b)

water

c)

cells

d)

blood

41.

Food is safe when is it _____________.

a)

irradiated

b)

contaminated

42.

Is radioactive decay 'spontaneous' ?

a)

yes

b)

no

c)

sometimes

43.

Is radioactive decay 'random' ?

a)

yes

b)

no

c)

sometimes

44.

Which best describes what happens during radioactive decay?

a)

the emission of radioactivity

b)

the build up of radioactivity

c)

the splitting of radioactivity

d)

the expansion of radioactivity

45.

During radioactive decay, the element can change?

a)

true

b)

false

46.

During radioactive decay ....?

a)

radioactivity is always given out

b)

radioactivity is sometimes given out

c)

radioactivity is never given out

47.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
48.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
a)
0.25g
b)
2.5g
c)
25g
d)
80g
49.
What percent of carbon-14 would be left after 5730 years?
a)
100%
b)
75%
c)
50%
d)
25%
50.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
51.
what's the half life of this substance?
a)
1 day
b)
2 days
c)
3 days
d)
4 days
52.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
53.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
54.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
55.
146C has a half-life of 5730 years how many grams of a 4.0 g sample would be left after 3.5 half-lives?
a)
1.0 g
b)
0.5 g
c)
0.38 g
d)
None would be left
56.
146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?
a)
4 years
b)
5730 years
c)
22,920 years
d)
28,650 years
57.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
58.
What type of decay is being illustrated in following picture? 
a)
beta decay
b)
alpha decay 
59.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma 
d)
none
60.
Selenium-83 has a half life of 25 minutes. How many minutes would it take for a 20 milligram sample to decay and only have 1.25 milligrams of it remaining? 
a)
25 minutes
b)
50 minutes
c)
75 minutes 
d)
100 minutes
61.
What is the half life of Polonium-218 if 0.0625 grams remains of a 2.00 gram original sample after 15 minutes? 
a)
5 minutes
b)
3 minutes
c)
15 minutes
d)
7.5 min
62.

True or False: Irridaiting food makes it radioactive and unsafe to eat

a)

True

b)

False

63.

A geiger counter measures_____

a)

Radiation

b)

Electricity

c)

Magnetism

d)

Time

64.

Which of these is a common medical use of radiation

a)

Destroying cancer cells

b)

Sterilizing equipment

c)

Using X-rays to view inside the body

d)

All of these

65.

What type of radiation do smoke detectors emit?

a)

Beta radiation

b)

Gamma Radiation

c)

X-rays

d)

Alpha radiation

66.

Which isotope of carbon is used in carbon dating?

a)

carbon 6

b)

carbon 12

c)

carbon 13

d)

carbon 14

67.

Suggest way that a scientist can protect themselves against exposure when handling radioactive sources.

a)

Storing sources in a lead–lined box using tongs

b)

Goggles and gloves

c)

Tie hair back

68.

The mass of the atom is concentrated in the________ which contains _________and________

a)

shell - protons - electrons

b)

nucleus- neutrons - protons

c)

nucleus - protons- electrons

d)

shell - neutrons - protons

69.

What is a use of radioactive materials in medicine?

a)

oxygen masks

b)

antibiotics

c)

tracers

d)

heat monitors

70.

Artificial radiation is the radiation or nuclear energy that is released during nuclear reactions __________

a)

from cosmic rays

b)

in Earths crust

c)

in nuclear reactors and nuclear bombs

d)

in space

71.

A fossil has 25% as much carbon 14 as a living sample. How many half-lives of carbon 14 have passed since the fossilized creature died?

a)

1

b)

2

c)

3

d)

4

72.

Which of these is a use of alpha radiation?

a)

Sterilising food

b)

Smoke detectors

c)

Monitoring paper thickness

d)

Industrial tracers

73.
For which of the following problems would a scientist most likely use carbon-14? 
a)
to calculate the age of the Earth's oldest rocks
b)
to calculate the age of a piece of bone 
c)
to identify the elements that make up a rock 
d)
to identify the elements that make up a bone
74.
Radioactive tracers are useful in ____.
a)
calculating the ages of fossils 
b)
fueling nuclear reactions 
c)
determining medical problems 
d)
treating brain tumors 
75.

How is radiation used to treat cancer?

a)

Radiation is used to stimulate the growth of cancer cells

b)

Cancer cells are bombarded with radiation and become inactive

c)

Cancer cells are burned up by radiation

d)

Radiation melts cancer cells

76.

Suggest way that a scientist can protect themselves against exposure when handling radioactive sources.

a)

Storing sources in a lead–lined box using tongs

b)

Goggles and gloves

c)

Tie hair back

77.
Name the instrument used to detect radioactivity.
a)
voltmeter
b)
ohmeter
c)
seismograph
d)
geiger counter
78.

Which of these is a use of beta radiation?

a)

Sterilising food

b)

Smoke detectors

c)

Monitoring metal sheet thickness

d)

Industrial tracers

79.

Radioactivity can be harmful and cause disease because it affects _________.

a)

air

b)

water

c)

cells

d)

blood

80.

Food is safe when is it _____________.

a)

irradiated

b)

contaminated

81.

Which alpha emitting radioisotope is found in smoke detectors?

a)

Polonium-210

b)

Uranium-238

c)

Americium-241

d)

Carbon-14

82.

How can find the Number of neutrons ?

a)

mass number - atomic number

b)

atomic number - mass number

c)

proton - electron

83.

The type of radioactivity particle that can be stopped by a sheet of paper is the

a)

Alpha particle

b)

Beta particle

c)

Gamma ray

d)

uranium

84.

The type of radioactivity particle that can be stopped by a sheet of foil is the

a)

Alpha particle

b)

Beta particle

c)

Gamma ray

d)

uranium

85.

The most penetrating type of radiation is the

a)

Alpha particle

b)

Beta particle

c)

Gamma ray

d)

Uranium

86.
Which part of an atom is POSITIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
87.
What part of an atom is NEGATIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
88.
Nuclear energy uses _____ to turn turbines to power a generator.
a)
wind
b)
water
c)
steam
d)
solar
89.

What is nuclear waste?

a)

Hazardous waste that contains radioactive material

b)

Waste from plastic

c)

Hazardous waste from carbon dioxide

90.

The factors to be considered in operating a nuclear power station are

a)

fossil fuels such as coal, natural gas and petroleum will deplete

b)

effects of pollution due to nuclear energy is less compared to fossil fuels

c)

the rate of energy production by nuclear power is much greater than that of fossil fuels

d)

all the above

91.

What are gamma rays?

a)

Neutrons

b)

Electrons

c)

Protons

d)

Waves of electromagnetic radiation

92.

What is the main reason a nucleus emits a neutron?

a)

To decrease its energy

b)

To increase its stability

c)

To increase its charge

d)

To increase its mass

93.
In order of most to least penetrating radiation we have
a)
Alpha , Beta,  Gamma
b)
Beta , Gamma , Alpha
c)
Gamma, Beta, Alpha
d)
Gamma, Alpha, Beta
94.
What type of radiation can be stopped by a piece of paper?
a)
Alpha radiation
b)
Beta radiation
c)
Gamma radiation
95.
What type of radiation can be stopped by a 5 mm piece of aluminium?
a)
Alpha radiation
b)
Beta radiation
c)
gamma radiation
96.
What type of radiation can be stopped by a thick lead sheet?
a)
Alpha radiation
b)
Beta radiation
c)
gamma radiation
97.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
98.
What is emitted during Alpha Radiation?
a)
A helium nuclei.
b)
A helium atom
c)
Gamma Rays.
d)
Positrons
99.
What is the symbol for an alpha particle?
a)
42He
b)
0-1e
c)
0+1 e
d)
10n
100.

An Alpha particle has an electric charge of

a)

+1

b)

-1

c)

+2

d)

no electric charge

101.

A Gamma ray has an electric charge of

a)

+1

b)

-1

c)

+2

d)

no electric charge

102.

Which is an Alpha particle?

a)
b)
c)
103.
Has the symbol
a)
Alpha
b)
Beta 
c)
Gamma
d)
electron
104.
Has the symbol
a)
Alpha
b)
Beta
c)
Gamma
d)
neutron
105.

Beta has what charge

a)

+1

b)

+2

c)

-1

d)

-2

106.

Which type of radiation is LEAST penetrating

a)

Alpha

b)

Beta

c)

Gamma

107.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron
108.
Complete the nuclear equation and determine the type of decay that is occurring in this reaction. 
a)
alpha
b)
beta
c)
gamma
d)
none
109.
Solve this equation for alpha decay.
20985At = ___ + 42He
a)
20583Bi
b)
20986Rn
c)
20781Tl
d)
20885At
110.
Solve this equation for alpha decay.
22688Ra = ___ + 42He
a)
22286Rn
b)
22689Ac
c)
22484Po
d)
22588Ra
111.
Solve this equation for beta decay.
6027Co = ___ + 0-1e
a)
5625Mn
b)
6028Ni
c)
5823V
d)
5927Co
112.
Solve this equation for beta decay.
146C = ___ + 0-1e
a)
104Be
b)
147N
c)
102He
d)
136C
113.
The following is an example of what type of reaction?
24395Am  →  23993Np + 42He 
a)
alpha decay
b)
beta decay
c)
gamma decay
114.
What is the missing isotope that will balance the following nuclear equation?
94Be  +  11H →  _____  +  42He
a)
105B
b)
105Ne
c)
63Li
d)
63C
115.
What is the symbol for an alpha particle?
a)
42He
b)
0-1e
c)
0+1 e
d)
10n
116.

The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?

a)

alpha, gamma, beta

b)

beta, alpha, gamma

c)

beta, gamma, alpha

d)

gamma, beta, alpha

117.

Which equation correctly represents the alpha decay of polonium-214?

a)

A

b)

B

c)

C

d)

D

118.

This equation shows the radioactive decay of thorium (Th). Which of the following particles is released in this reaction?

a)

alpha

b)

beta

c)

neutron

d)

gamma

119.
a)

alpha particle

b)

beta particle

c)

neutron

d)

proton

120.
a)

A

b)

B

c)

C

d)

D

121.
a)

A

b)

B

c)

C

d)

D

122.
a)

it's 88 because element X gains 2 protons

b)

it's 218 because element X loses 2 protons and 2 neutrons

c)

it's 220 because element X loses 2 neutrons

d)

it's 226 because element X gains 2 protons and 2 neutrons

123.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron
124.

What are the two main types of nuclear decay that can be represented in a nuclear?

a)

Alpha and Beta

b)

Beta and Gamma

c)

Alpha and Gamma

d)

  1. Delta and Epsilon

125.

  1. In nuclear decay, what is ejected from the nucleus?

a)

  1. a) Protons

b)

  1. b) Neutrons

c)

  1. c) Particles such as alpha or beta particles

d)

  1. d) Electrons

126.

  1. Which of the following statements best explains the purpose of nuclear decay?

a)

  1. a) It's a process to increase the energy of the nucleus.

b)

  1. b) It's a process to make the nucleus unstable.

c)

  1. c) It's a process to make the nucleus more stable.

d)

  1. d) It's a process to change the element into another one.

127.

  1. What does an alpha particle consist of?

a)

  1. a) 2 protons and 2 electrons

b)

  1. b) 2 protons and 2 neutrons

c)

  1. c) 2 protons, 2 neutrons, and 2 electrons

d)

  1. d) 2 neutrons and 2 electrons

128.

  1. What happens to the atomic number of a nucleus when it undergoes alpha decay? .

a)

  1. a) It increases by 2

b)

  1. b) It decreases by 2

c)

  1. c) It remains the same

d)

  1. d) It increases by 4

129.

  1. What happens to the atomic number of a nucleus when it undergoes beta decay?

a)

  1. a) It increases by 1

b)

  1. b) It decreases by 1

c)

  1. c) It remains the same

d)

  1. d) It increases by 2

130.

  1. Which particle is released during beta decay?

a)

  1. a) Alpha particle

b)

  1. b) Proton

c)

  1. c) Neutron

d)

  1. d) Electron

131.

  1. When thorium-230 undergoes alpha decay, what does it become?

a)

  1. a) Radium-226

b)

  1. b) Radon-222

c)

  1. c) Uranium-226

d)

  1. d) Thorium-226

132.

  1. If a radioactive isotope undergoes beta decay and changes from carbon-14 to nitrogen-14, what is ejected from the nucleus?

a)

  1. a) Alpha particle

b)

  1. b) Beta particle

c)

  1. c) Gamma radiation

d)

  1. d) Neutron

133.

  1. Complete the following decay equation: Polonium-214 (atomic number 84) → Lead-210 (atomic number 82) + ________

 

a)

  1. a) Alpha particle

b)

  1. b) Beta particle

c)

  1. c) Gamma radiation

d)

  1. d) Neutron

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Grade 8 Test 1 Review

128 questions

Grade 8 Test 1 Review

quiz

Worksheet

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8th - 11th Grade