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A Level · AS · multiple choice

AS Level foundations · Question 6

AS Level foundations · Original GioPhysics question with a detailed, mark-by-mark answer guide.

Demand
recall
Marks
1
Topics
1
Answer
Complete
multiple choice1 mark

Which combination of quarks forms a neutron?

  1. A

    up, up, down

  2. B

    up, down, down

  3. C

    up, up, strange

  4. D

    down, down, down

Ready to self-mark?Reveal the detailed answer guide
Answer overviewCorrect answer: B — up, down, down
01

Answer and reasoning

1 mark
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. 1

    The correct choice is B: up, down, down

  2. 2

    A is the proton. The check is the charge: (+2/3) + (−1/3) + (−1/3) = 0, and D would give −1.

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