alleryStart learning →What makes an atomic nucleus radioactive?
- It is always charged
- It is unstable
- It has no electrons
- It has no protons
Show answer and solution
Correct answer: B. It is unstable
Radioactivity is associated with unstable nuclei.
ICSE Class 10 Modern Physics: radioactivity, nuclear fission and fusion — practice questions
Explore 61 free Modern Physics: radioactivity, nuclear fission and fusion questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 61.
What makes an atomic nucleus radioactive?Read the answer and worked solution →What happens in radioactive decay?Read the answer and worked solution →Which set names three common radioactive decay types?Read the answer and worked solution →Can the decay time of one particular atom be predicted?Read the answer and worked solution →What does a half-life describe for a radionuclide sample?Read the answer and worked solution →A sample has 80 undecayed atoms. After one half-life, how many remain?Read the answer and worked solution →After two half-lives, what fraction of a sample remains undecayed?Read the answer and worked solution →Radioactive activity is measured using which named unit?Read the answer and worked solution →One becquerel corresponds to what activity?Read the answer and worked solution →Which helium isotope nucleus is an alpha particle?Read the answer and worked solution →What is the charge of an alpha particle?Read the answer and worked solution →Which radiation consists of a high-speed electron or positron?Read the answer and worked solution →Which negatively charged lepton is emitted in beta-minus decay?Read the answer and worked solution →Which interaction is associated with beta decay?Read the answer and worked solution →Which radiation has no electric charge?Read the answer and worked solution →What kind of radiation is a gamma ray?Read the answer and worked solution →Which material can shield against penetrating gamma rays?Read the answer and worked solution →Which sequence orders alpha, beta and gamma by increasing penetration?Read the answer and worked solution →Which radiation is stopped by a few centimetres of air or skin?Read the answer and worked solution →Which radiation passes through many common materials most easily?Read the answer and worked solution →Which radiation is most strongly ionizing among alpha, beta and gamma?Read the answer and worked solution →What name is given to the nucleus present before decay?Read the answer and worked solution →What is a product nucleus after radioactive decay called?Read the answer and worked solution →When does radioactive decay create a different chemical element?Read the answer and worked solution →What does nuclear fission do to an atomic nucleus?Read the answer and worked solution →What is often produced along with fission fragments?Read the answer and worked solution →What can a neutron released in fission cause?Read the answer and worked solution →In a fission chain reaction, what does k = 1 mean?Read the answer and worked solution →When is a fission chain reaction subcritical?Read the answer and worked solution →In a critical reactor, what sustains further fissions?Read the answer and worked solution →
Worked practice questions
What happens in radioactive decay?
- A molecule splits apart
- An atom gains an electron
- A stable nucleus gains mass
- An unstable nucleus loses energy
Show answer and solution
Correct answer: D. An unstable nucleus loses energy
Radioactive decay releases energy from an unstable atomic nucleus.
Which set names three common radioactive decay types?
- Heat, light and sound
- Proton, neutron and ion
- Fission, fusion and orbit
- Alpha, beta and gamma
Show answer and solution
Correct answer: D. Alpha, beta and gamma
The common decay types are alpha, beta and gamma.
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