Cambridge IGCSE Physics - 0625 - Core Paper 1 2012 Summer Zone 2

A cylindrical can is rolled along the ruler shown in the diagram. The can rolls over twice. What is the circumference (distance all round) of the can?

Drops of water are dripping steadily from a tap (faucet). The diagram shows a measuring cylinder which has collected 120 drops of water. [Image] How many drops in total will have been collected when the measuring cylinder reads 10 cm^3?

In a race, a car travels 60 times around a 3.6 km track. This takes 2.4 hours. What is the average speed of the car?

A metal block is heated until it is completely melted. It is then allowed to solidify. What happens to the mass of the metal during the changes of state?
[Table_1]:
| mass during melting | mass during solidification |
| --- | --- |
| A | decreases | increases |
| B | increases | decreases |
| C | increases | stays constant |
| D | stays constant | stays constant |

Two objects X and Y are placed on a balance. The balance tilts as shown. What does this show about the masses and weights of objects X and Y?

A stone has a volume of 0.50 cm$^3$ and a mass of 2.0 g.
What is the density of the stone?

Passengers are not allowed to stand on the upper deck of double-decker buses.

Why is this?

On which ball is a non-zero resultant force acting? [Image_1: Diagram showing four scenarios; A: a ball moving at constant speed on a smooth surface, B: a ball at rest on a bench, C: a free-falling ball which has just been released, D: a ball floating on water]

Electricity can be obtained from different energy resources.
Which energy resource is used to obtain electricity without producing heat to boil water?

A ball is dropped on to a hard surface and bounces. It does not bounce all the way back to where it started, so it has less gravitational potential energy than when it started.
What happens to the 'lost' energy?

What does a barometer measure?

In which position would a boy exert the most pressure on the ground?

On a warm day, a swimmer climbs out of a swimming pool into the open air and water evaporates from his skin.
As the water evaporates, which molecules escape into the air first and what happens to the average speed of the remaining water molecules?

Some air is trapped inside a metal can with a tightly fitting lid.
When the can is heated strongly behind a safety screen, the lid is blown off by the increased pressure inside the can.
What causes the increase in pressure of the air inside the can?

A solid object has a very large thermal capacity.
What does this mean?

A hot drink is left in a room that is at a temperature of 20°C. What has happened to the drink after ten minutes?

An engineer wants to fix a steel washer on to a steel rod. The rod is just too big to fit into the hole of the washer. How can the engineer fit the washer on to the rod?

A rod is made of copper and wood joined together. The rod is heated at the join in the centre for about a minute. At which labelled point will the temperature be lowest, and at which point will it be highest?

Two plastic cups are placed one inside the other. Hot water is poured into the inner cup and a lid is put on top, as shown.
Which statement is correct?

Which row shows the nature of light waves, sound waves and X-rays? [Table_1]

The diagram shows plane water waves passing through a narrow gap in a barrier.
The waves spread out on the far side of the barrier.
Which property of waves does this illustrate?

The diagram shows radiation from a lamp passing through a prism. Which type of radiation is found at P?

A plane mirror is used to form an image of an object.
At which labelled point is the image formed?

A converging lens in a projector is used to make an \textbf{enlarged} image of a small piece of film on a screen.
At which labelled point could the piece of film be placed so that the lens produces this image?

A girl stands at a distance from a large building. She claps her hands and a short time later hears an echo.
Why is an echo produced when the sound waves hit the building?

Three loudspeakers vibrate at different frequencies of 5 hertz, 25 kilohertz and 50 kilohertz.
Which row shows whether the vibrations from each loudspeaker can be heard by a human? [Table_1]

The diagram shows a magnet being brought near to an unmagnetised iron bar. This causes the iron bar to become magnetised.

Which magnetic pole is induced at X and how is the iron bar affected?

A student wishes to make a permanent magnet. She has an iron rod and a steel rod.
Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?
[Table_1]

In which unit is potential difference measured?

The circuit shown in the diagram contains an unknown component X, hidden in a box.
The voltage-current graph for X is as shown.



What is the component X?

A relay is used to operate a large electric motor using a switch some distance from the motor. What is the purpose of the relay?

The circuit diagram includes two resistors connected in parallel.

Which statement is correct?

A circuit is connected for use as a potential divider.

The resistance of resistor X is 10Ω.
When the resistance of the variable resistor Y is 20Ω, what is the reading on the voltmeter?

An air conditioner and a television are both connected to the same electrical circuit. The current in the air conditioner is 4.0A and the current in the television is 6.0A. Several different fuses are available. Which fuse should be connected at X?

The diagram shows a transformer. The input voltage and the number of turns on each coil are shown.



What is the output voltage?

Which device uses slip rings?

The diagram shows some parts of a cathode-ray tube which is producing cathode rays.
Which is a correct description of the cathode?

When measuring the emissions from a radioactive rock brought into the laboratory, a teacher mentions that background radiation must be taken into account. What is this background radiation?

The diagram shows the paths of three different types of radiation, X, Y and Z.



Which row in the table correctly identifies X, Y and Z?

Which statement about a neutral atom of $^{226}_{88}\text{Ra}$ is correct?