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

The speed-time graph shown is for a bus travelling between stops.
Where on the graph is the acceleration of the bus greatest?

A parachutist inside an aeroplane has a mass of 70 kg.

What is his mass after he has jumped from the aeroplane?

A large bag of feathers and a steel block balance each other on some scales. What does this show about the masses and the weights of the bag of feathers and the steel block?

Two stones of different weight fall at the same time from a table. Air resistance may be ignored. What will happen and why?

A pendulum is set in motion and timed. The time measured for 20 complete swings is 30 s.
What is the time for one complete swing of the pendulum?

The diagram shows sections of four objects of equal mass. The position of the centre of mass of each object has been marked with a cross. Which object is the most stable?

A heavy table has six legs. The area of cross-section of each leg is X.
The legs of the table make marks in a carpet. These marks become deeper with increased pressure.
What would reduce the depth of the marks for a table of a fixed weight?

The diagram shows a mercury barometer.

Which distance is used to calculate the pressure of the atmosphere?

A liquid has a density of 0.80g/cm^3.
Which could be the volume and mass of this liquid?
[Table_1]

Very small pollen grains are suspended in water. A bright light shines from the side.
Looking through a microscope, small specks of light are seen to be moving in a random, jerky manner.



What are the moving specks of light?

A see-saw is made by resting a long plank of wood with its centre of mass on a barrel.
A boy sits on one side of the barrel and a girl sits on the other side so that the see-saw is balanced.
[Image_1: A see-saw with a boy and a girl, x for distance to the boy, y for distance to the girl.]
Which statement must be true?

A skier walks from the bottom of a ski slope to the top and gains 10 000 J of gravitational potential energy.
She skis down the slope. At the bottom of the slope, her kinetic energy is 2000 J.
How much energy was converted into thermal energy and sound energy as the skier moved down the slope?

A power station uses nuclear fission to obtain energy.
In this process, nuclear energy is first changed into

A person lifts boxes of equal weight on to a platform.

Which quantity will not affect the work done by the person?

Which physical property is used to measure temperature in a liquid-in-glass thermometer?

A boy sits near a campfire. He pokes the fire with an iron bar. His hand becomes hot.

In which ways does thermal energy (heat) from the fire reach his hand?

The graph shows the temperature of a substance as it is heated steadily.
In which part of the graph is the substance boiling?

A swimmer feels cold after leaving warm water on a warm, windy day. Why does she feel cold even though the air is warm?

After a sheep has its wool cut off, it is harder for it to stay warm when the air temperature falls. How does the wool help the sheep to stay warm?

A night storage heater contains a large block of material that is heated electrically during the night. During the day the block cools down, releasing thermal energy into the room.
Which thermal capacity and which night-time temperature increase will cause the most energy to be stored by the block?

[Table_1]

A swimmer is sitting on a rock at the sea shore looking at passing waves. He notices that five complete wavelengths pass him in 20 s.
What is the frequency of this wave?

In a test, a car horn is found to be too loud and the pitch of the note is too high. What information does this give about the amplitude and the frequency of the sound wave produced? [Table with amplitude and frequency options]

A girl notices that when she shouts into a cave she hears an echo.
Which wave property causes the echo?

A piece of paper has 'PAL' written on it. A student holds the paper in front of a plane mirror. What does the student see?

The diagram shows plane waves reflected by a plane surface. Which line represents a wavefront?

A thin converging lens forms an image.
What is the nature of this image and can it be formed on a screen?
[Table_1]

Which of these is an electric current?

A student connects the circuit shown. Which switches must be closed for the bell to ring without lighting the lamp?

The diagram shows two voltmeters, P and Q, connected to a potential divider.

The sliding connection at point X is moved towards the top of the diagram.
What happens to the reading on P and to the reading on Q?

The diagram shows a circuit used to find the resistance of lamp L.
Blocks P, Q and R represent the different components used.



Which is a correct possible choice of components to use for P, Q and R?

Which row shows a use of a capacitor and a use of a relay? [Table_1]

Which graph shows how the voltage of a simple a.c. generator varies with time?

Some electrical devices require a magnet which may be switched on and off many times in a second.
Which type of magnet may be used?

Two bars of soft iron are placed near a bar magnet.

Which row states and explains the behaviour of poles P and Q of the soft iron bars?

The diagram shows a wire in the magnetic field between two poles of a magnet.

The current in the wire repeatedly changes between a constant value in one direction and a constant value in the opposite direction. This is shown on the graph.

What is the effect on the wire?

An electric oven is connected to the mains supply using insulated copper wires. The wires become very warm.
What can be done to prevent so much heat being produced in the connecting wires?

A beam of cathode rays passes between two parallel, charged metal plates in a vacuum.
In which direction is the beam deflected?

Which statement about a carbon nucleus represented by $^{14}_{6}C$ is correct?

How does the ionising effect of $\alpha$-particles compare with that of $\beta$-particles and $\gamma$-rays? [Table_1]

The table shows the count rates obtained from four radioactive sources. The measurements were taken at noon on four consecutive days.
Which source has the longest half-life?

[Table_1]