What happens when a solid is heated and expands?

The diagram shows two divergent rays of light from an object O being reflected from a plane mirror.

At which position is the image formed?

Which statement is correct?

A young person with healthy ears can hear a range of frequencies.

What is the approximate range of frequencies?

An electric current in a wire is into the page.

Which diagram shows the shape and direction of the magnetic field around the wire?

A copper wire X has resistance R. Another copper wire Y has twice the length and half the cross- sectional area of X.

What is the resistance of Y?

An electrical appliance is plugged into a socket in the wall. The plug contains a fuse. What is the main purpose of the fuse?

The diagram shows a set of apparatus used to determine the specific heat capacity of water.

What does not affect the rate at which energy is lost to the surroundings?

Two thermometers X and Y contain different liquids but are otherwise identical.

The thermometers are heated through the same temperature rise. The volume of liquid in thermometer X increases by more than the volume of liquid in thermometer Y.

Which is the more sensitive thermometer and which is the thermometer with the larger range?

The diagram shows air trapped in a flask by a small volume of water in a thin tube.

When the flask is held in a student’s hands, the small volume of water first moves down from P to Q, and then up to R.

Why does the small volume of water move like this?