Match the following:

If we add a lump of ice to a tumbler containing water:

1. heat flows from water to ice
2. heat flows from ice to water
3. heat flows from water to ice if water is more
4. heat flows from ice to water if ice is more

A thermometer uses:

1. water
2. mercury
3. air
4. none of the above

Which statement is correct:

1. Iron rims are cooled before they are placed on cart wheels.
2. A glass stopper gets tight on warming the neck of the bottle.
3. Telephone wires sag in winter, but becomes tight in summer.
4. A little space is left between two rails on a railway track.