A ruler is used to measure the length of a nail.
What is the length of the nail?

In an experiment, two students investigated the speed and frequency of waves on the sea. This is shown is Fig. 3.1.
The two students stood 60 metres apart on a pier that projected a long way into the sea.
Student A waved his hand when a wave passed him. At that moment, student B started a clock.
Student B watched the wave as it moved towards him. When the wave reached him, he stopped the clock.
The students repeated this procedure until they had four results. Fig. 3.2 shows the clock dials for the four results.
Read the dials and then determine:
(i) the average time taken for the wave to travel 60.0 metres .
(ii) the average speed of the wave.

The diagram shows the height of a stack of identical coins.
What is the thickness of one coin?

The diagrams show liquids in a burette and a measuring cylinder.
Which row shows the correct readings for the burette and the measuring cylinder?

The diagram shows the steps in the preparation of a salt.
What are the names of the processes taking place in steps 3 and 4?

A student uses a measuring cylinder to measure the volume of some water. The diagram shows part of the measuring cylinder. The top and bottom of the meniscus are labelled.
What is the volume of the water?

The diagram shows four identical spheres placed between two wooden blocks on a ruler.
What is the diameter of one sphere?

A student has a beaker of liquid. The student makes some measurements. His results are shown in the table
What is the mass of the liquid in the beaker?

A falling object pulls a paper strip through a timer. The timer marks dots on the paper strip at intervals of 0.020 s.
The diagram shows a section of the paper strip with the first three dots marked.
What are the average speeds of the falling object in each of the first two 0.020 intervals?