IGCSE · 5 · multiple choice
Nuclear physics · Question 5
Nuclear physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
Which is not a source of background radiation?
- A
cosmic rays reaching the Earth from space
- B
radon gas seeping from rocks and soil
- C
the Earth's magnetic field
- D
naturally occurring isotopes in food and drink
Ready to self-mark?Reveal the detailed answer guide
Answer overviewCorrect answer: C — the Earth's magnetic field
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: the Earth's magnetic field
- 2
A magnetic field is not ionising radiation. The other three are the standard components of background, and candidates who have only learned that background is "from rocks" miss B or D.
Private on this device