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.
Edexcel questions courtesy of Pearson Education Ltd.
Sample question 1 - Foundation and Higher
Question
A student finds the graph shown in the figure for the stretching of a wire.
Describe the non-linear stretching of the wire shown in the graph. [3 marks]
Above 37.5 N there are large increases of extension for small increases in load. The maximum extension of the wire is about 16.5 mm before it breaks. Above 12 mm the wire keeps on extending when the load is reduced below 46 N.
Make sure you describe three separate features of the graph clearly and use numbers from the graph in your answer.
Sample question 2 - Higher
Question
A student has three containers A, B, and C. Each container contains a liquid.
The table shows some data about the liquids and containers.
| Container | Area of base (cm虏) | Name of liquid | Density of liquid (g/cm鲁) | Depth of liquid (cm) |
| A | 16 | Water | 1.00 | 50.00 |
| B | 32 | Mineral oil | 0.91 | 50.00 |
| C | 12 | Water | 1.00 | 25.00 |
| Container | A |
|---|---|
| Area of base (cm虏) | 16 |
| Name of liquid | Water |
| Density of liquid (g/cm鲁) | 1.00 |
| Depth of liquid (cm) | 50.00 |
| Container | B |
|---|---|
| Area of base (cm虏) | 32 |
| Name of liquid | Mineral oil |
| Density of liquid (g/cm鲁) | 0.91 |
| Depth of liquid (cm) | 50.00 |
| Container | C |
|---|---|
| Area of base (cm虏) | 12 |
| Name of liquid | Water |
| Density of liquid (g/cm鲁) | 1.00 |
| Depth of liquid (cm) | 25.00 |
Explain which container has the highest pressure at the bottom, and which container has the lowest.
Use information from the table. [3 marks]
Pressure in A is the highest and pressure in C is the lowest. Pressure depends on depth of liquid. Since A and B have the same depth, the pressure in A is greater than the pressure in B. Pressure depends on density of liquid. Since A and C have the same liquid, the pressure in A is greater than the pressure in C.