Cambridge IGCSE Physics - 0625 - Core Paper 1 2011 Winter Zone 2

The graph shows how the speed of a car changes with time. Between which two times is the car stationary?

A ruler is used to measure the length of an object.

What is the length of the object?

A student is told to measure the density of a liquid and also of a large cube of metal.
Which pieces of equipment are sufficient to be able to take the measurements needed?

The diagrams show four blocks with the same mass.
Which block is made from the least dense material?

A child is standing on the platform of a station.
A train travelling at 30 m/s takes 3.0 s to pass the child.
What is the length of the train?

Which combination of forces produces a resultant force acting towards the right?

A student adds weights to an elastic cord. He measures the length of the cord for each weight. He then plots a graph from the results, as shown.
Which length has he plotted on the vertical axis?

The weight of an object is to be found using the balance shown in the diagram.

The object is put in the left-hand pan and various standard weights are put in the right-hand pan. These are the results.
[Table_1]
What is the best estimate of the weight of the object?

A uniform rod rests on a pivot at its centre. The rod is not attached to the pivot. Forces are then applied to the rod in four different ways, as shown. The weight of the rod can be ignored.
Which diagram shows the rod in equilibrium?

A force $F$ moves a load from the bottom of a slope to the top.



The work done by the force depends on the size of the force, and on a distance.

What is this distance?

The pressure of a fixed mass of gas in a cylinder is measured. The volume of the gas in the cylinder is then slowly decreased. The temperature of the gas does not change. Which graph could show the change of pressure of the gas during this process?

A water manometer is used to measure the pressure of a gas supply.

When it is attached to the gas supply, the water falls on the left side and rises on the right side.
The difference in the levels of water on the two sides is now 20 cm.
What is the pressure of the gas supply?

A chair is placed on protective cups to prevent damage to the carpet underneath it. [Diagram_1] How do the cups change the area of contact with the carpet and the pressure on it?

To mark the lower fixed point of a Celsius scale on a thermometer, the thermometer should be placed in

Two identical copper cans are filled with boiling water.

One can is insulated with wool. The temperature of the water in each can is taken every minute for several minutes. Graphs of the results are plotted.
Which graph shows the results obtained?

Evaporation occurs when molecules escape from a liquid surface into the air above it. During this process the temperature of the liquid falls. Why does the temperature of the liquid fall?

The diagram shows a cooling unit in a refrigerator.
Why is the cooling unit placed at the top?

The diagram shows an electric heater being used to heat a beaker of water and an identical beaker of oil for several minutes. The temperature of the water and the temperature of the oil increase constantly. The rise in temperature of the oil is much greater than that of the water. Why is this?

The diagram shows the image of a clock in a plane mirror.

What time is shown?

The diagram shows a ray of light travelling from X. Angle P is less than the critical angle. In which direction does the ray continue?

Radio waves are received at a house at the bottom of a hill. The waves reach the house because the hill has caused them to be

Which of these waves is longitudinal?

The diagrams show the wave shapes of two different sounds. The scales are the same in each diagram.



How does sound 2 compare with sound 1?

A student wishes to measure the speed of sound in air. She plans to measure the time between making a sound and hearing the echo from a cliff.

She will use the equation: $\text{speed} = \frac{\text{distance}}{\text{time}}$.
Which type of sound should she make and which distance should she use in her calculation?
[Table_1]

Which symbols are used for the units of current and of resistance? [Table_1]

The diagrams show four arrangements of resistors.
Which arrangement has the smallest total resistance?

The diagram shows an electric circuit containing three meters, X, Y and Z, all connected correctly.



What are meters X, Y and Z?

The diagram shows a potential divider circuit with two identical lamps L_1 and L_2.

The contact K is halfway between X and Y and the lamps are equally bright.
What will happen to the brightness of the lamps when contact K is moved a short distance towards X?

The diagram shows a lamp in a circuit.
Which change to the circuit would increase the current in the lamp?

A fuse and a relay each use an effect of an electric current.
Which effect of an electric current is used by a fuse and which effect is used by a relay?
[Table_1]

Four nails, A, B, C and D, are tested to find which makes the strongest permanent magnet.

One of the nails is placed against a bar magnet and the number of paper clips which the nail can support is recorded. The bar magnet is then removed and the number of paper clips remaining attached to the nail is recorded. Each nail is tested in turn.
Which nail becomes the strongest permanent magnet?
[Table_1]

A horseshoe magnet is brought near to an unmagnetised iron bar. Which row in the table shows the magnetic poles induced in the iron bar and the direction of the forces between the bar and the magnet? [Table_1]

Which diagram represents the direction of the magnetic field around a straight wire carrying a current out of the page?

The diagram shows a simple transformer.

From which material should the core be made?

The diagram shows an a.c. generator.



With the coil in the position shown, the output voltage is +10V.
When does the output voltage become -10V?

A scientist needs to use a source of $\gamma$-rays as safely as possible. Which action will not reduce the amount of radiation that reaches the scientist?

A nuclide of substance X has the symbol $^{26}_{12}X$.
How many electrons are there in a neutral atom of substance X?

The graph shows the activity of a radioactive source over a period of time.

What is the half-life of the source?

Cathode rays are emitted in a vacuum tube. They consist of particles that are found in atoms. What is the name of the particles and how are the cathode rays produced? [Table_1]

Two parallel metal plates in a vacuum are connected to the terminals of a high-voltage power supply. A beam of cathode rays is passed into the space between the two plates, as shown.
In which direction does the beam of cathode rays deflect?