Lesson 6.4.2.1
6.4.2.1 Radioactive decay and nuclear radiation Quiz: AQA Combined Science, Unit 21
20 questions
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Lesson 6.4.2.1, Radioactive decay and nuclear radiation: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 21: Atomic structure, written with Revision Ninja.
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The 20 questions
-
What is the unit of activity?
- Coulomb (C)
- Sievert (Sv)
- Gray (Gy)
- Becquerel (Bq)
-
What does a detector measure to find count-rate?
- Decays per second
- Radiation mass
- Total energy emitted
- Particle speed
-
Which type of radiation consists of two protons and two neutrons?
- Gamma ray
- Beta particle
- Neutron
- Alpha particle
-
What is a beta particle?
- High-speed electron
- Free neutron
- Electromagnetic wave
- Helium nucleus
-
What is a gamma ray?
- Charged proton
- Electromagnetic radiation
- Fast electron
- Helium nucleus
-
Which nuclear change occurs during beta decay?
- Neutron into proton
- Neutron into alpha
- Electron into positron
- Proton into neutron
-
Which of these is classified as a type of nuclear radiation?
- Alpha wave
- Neutron
- Beta photon
- X-ray
-
Which radiation has the greatest penetration through materials?
- Gamma ray
- Beta particle
- Alpha particle
- Proton
-
Which radiation has the greatest ionising power?
- Electromagnetic wave
- Beta particle
- Alpha particle
- Gamma ray
-
A source emits only alpha particles. What range do they typically have in air?
- A few centimetres
- Over a kilometre
- Several kilometres
- Several metres
-
A detector records 480 decays in 60 s. What is the count-rate?
- 480 per second
- 28 800 per second
- 8 per second
- 0.125 per second
-
A sample has an activity of 1200 Bq. How many decays happen per second?
- 12000
- 12
- 120
- 1200
-
Why is radioactive decay classified as a random process?
- Controlled by temperature
- Constant rate always
- Unpredictable individual decays
- Equal half-lives
-
What property of nuclear radiation is required knowledge for GCSE?
- Atomic mass
- Magnetic charge
- Ionising power
- Half-life
-
Which property makes gamma rays suitable for internal medical imaging?
- High ionising power
- High penetration
- Short range in air
- Zero charge
-
Why is an alpha radiation source particularly hazardous inside the body?
- Rapid speed
- Long half-life
- High ionising power
- High penetration
-
What effect does gamma emission have on a nucleus?
- Charge increases
- Mass decreases
- No change
- Protons decrease
-
Why do unstable atomic nuclei emit nuclear radiation?
- To form electrons
- To become stable
- To increase mass
- To absorb energy
-
Which radiation type has the longest range in air?
- Alpha
- Gamma
- Proton
- Neutron
-
What is the unit of count-rate?
- Counts per second
- Coulombs
- Joules
- Metres
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