Three and four mark questions

These are similar to one and two mark questions but you will be expected to write in more depth for three and four mark questions.

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Three and four mark questions usually require longer answers.

Edexcel questions courtesy of Pearson Education Ltd.

Sample question 1 - Foundation and Higher

Question

The figure shows the structure of an oxygen-14 atom:

A graphic showing the structure of an oxygen 14 atom. There is a nucleus of neutrons and protons in the centre, with electrons in formation on the outside.

Complete the four labels on the figure. [4 marks]

In the oxygen nucleus there are always 8 protons. There are 8 green particles so these are the protons [1]. The six grey particles must be the neutrons [1].

Sample question 2 - Higher

Question

Iodine-131 emits beta particles and gamma rays.

A patient is only given a small dose of iodine-131 during treatment.

Hospital staff who administer this treatment to a lot of patients are potentially exposed to greater risk.

Explain the dangers to hospital staff and state one safety precaution taken. [3 marks]

An explanation linking any two of:

  • gamma rays are highly penetrating
  • cause DNA/cells to mutate/kill cells/cause cancer
  • if subjected to repeated exposure

[2]

Safety - any one from:

  • warning signs
  • restricted access
  • shielding
  • do not touch
  • relevant protective clothing
  • monitor dose

[1]

Sample question 3 - Foundation and Higher

Question

Cobalt-60 is radioactive.

It emits beta radiation and gamma radiation.

Describe the differences between beta radiation and gamma radiation. [3 marks]

A description including any three of the following points:

  • beta (radiation) is electron(s)
  • beta has mass
  • beta has (negative) charge
  • beta is a better ioniser
  • beta is less penetrating
  • gamma radiation is electromagnetic
  • wave
  • gamma travels at a speed of light
  • gamma is just energy

[3]