Cambridge IGCSE Physics - 0625 - Core Paper 1 2015 Summer Zone 1

A geologist compares the volumes of three rocks, X, Y and Z. Three measuring cylinders contain different volumes of water. He places each rock into one of the measuring cylinders.
The diagrams show the measuring cylinders before and after the rocks are put in.
Which row shows the volumes of X, Y and Z in order, from largest to smallest?

A car moves with constant speed and then constant acceleration.
Which graph is the speed-time graph for the car?

A car travels 100 km. The journey takes two hours. The highest speed of the car is 80 km/h, and the lowest speed is 40 km/h. What is the average speed for the journey?

Diagram 1 shows a piece of foam rubber that contains many pockets of air. Diagram 2 shows the same piece of foam rubber after it has been compressed so that its volume decreases.

What happens to the mass and to the weight of the foam rubber when it is compressed?

A metal block has the dimensions shown. Its mass is 1000 g.

What is the density of the metal?

Four objects are each acted on by only two forces, as shown.
Which object is in equilibrium?

A student measures the length of a spring. She then hangs different weights from the spring. She measures the length of the spring for each different weight.

The table shows her results.

[Table_1]

What is the extension of the spring when the weight hung from it is 3.0 N?

Which energy resource is used to generate electricity without using any moving parts?

A cyclist travels down a hill from rest at point X, without pedalling. The cyclist applies his brakes and the cycle stops at point Y.
Which energy changes have taken place between X and Y?

"The diagram shows a simple mercury barometer.
Which height is used as a measurement of atmospheric pressure?"

A block with flat, rectangular sides rests on a table.

The block is now turned so that it rests with its largest side on the table.
How has this change affected the force and the pressure exerted by the block on the table?
[Table_1]

Two states of matter are described as follows.
In state 1, the molecules are very far apart. They move about very quickly at random in straight lines until they hit something.
In state 2, the molecules are quite closely packed together. They move about at random. They do not have fixed positions.
What is state 1 and what is state 2?
[Table_1]

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

The thermometer in the diagram has no scale.
Where must the bulb be placed so that 0°C can be marked on the stem?

A solid is heated from room temperature.
The graph shows how its temperature changes with time as it is heated constantly.
At which time has it just become completely liquid?

Thermal energy travels through space from the Sun to the Earth. Space is a vacuum. How is thermal energy transferred from the Sun to the Earth?

A cupboard is placed in front of a heater. Air can move through a gap under the cupboard.

Which row describes the temperature, and the direction of movement, of the air in the gap?

What is the number of wavefronts per second that pass a fixed point?

The diagrams represent water waves in a tank.
Which diagram represents a wave that changes speed?

The diagram shows the electromagnetic spectrum, in order of increasing wavelength. Three types of radiation, P, Q and R, are missing from the spectrum diagram. \[ \gamma\text{-rays} \quad \text{X-rays} \quad P \quad \text{visible light} \quad Q \quad \text{microwaves} \quad R \] Which types of electromagnetic radiation are represented by P, by Q and by R?

Radiation from the Sun is dispersed by a prism. The prism does not absorb any of the radiation. Four identical thermometers are placed, one at each of the labelled positions. In which position does the thermometer show the greatest rise in temperature?

A scientist tries to direct a ray of light in a glass block so that no light escapes from the top of the block. However, some light does escape.

The scientist changes angle X and stops the light escaping from the top.
Which row in the table describes the change to angle X and the name of the effect produced?

Which row states two properties of sound waves?
[Table_1]

A man holding a starting pistol stands 640 m away from a spectator.
The spectator hears the sound of the starting pistol 2.0 s after seeing the flash from the pistol. Using this information, what is the speed of sound in air?

A magnet is placed on a balance. The balance reading changes when an iron bar or another magnet is held close to the first magnet.
The arrangements are shown in the diagrams.

Which row gives the balance reading in diagram 2 and in diagram 3?

An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron core is just above some small soft-iron nails.

[Image of electromagnet setup]

The switch is now closed, left closed for a few seconds, and then opened. What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened?

The diagram shows a piece of metal resistance wire.
Which wire, made of the same metal, has a smaller resistance?

What is the unit of electromotive force (e.m.f.)?

The circuit diagram shows a 4.0Ω resistor and an 8.0Ω resistor connected to a 6.0V battery.

What is the current in the battery?

The diagram shows a circuit which includes an uncharged capacitor and a switch.
The switch can be moved between position X and position Y.
What happens to the capacitor when the switch is moved to position X, and what happens when the switch is then moved to position Y?

The diagram shows a 3.0Ω resistor and a 6.0Ω resistor connected in parallel.
What is the total resistance of this arrangement?

The diagram shows a 10Ω resistor and a 20Ω resistor connected in a potential divider circuit. What is the reading on the voltmeter?

In the circuit shown, only one of the fuses has blown, but none of the lamps is lit.
Which fuse has blown?
[Image_1: Circuit Diagram]

Which diagram shows the pattern of the magnetic field produced by a current-carrying solenoid?

What is an advantage of transmitting electricity at a high voltage?

A transformer has 1200 turns on its primary coil and 400 turns on its secondary coil. An output voltage of 90V is induced across the secondary coil.
What is the input voltage of the transformer?

The diagram shows a design for a cathode-ray tube. A tube with this design does not work.
Which change should be made so that the tube works properly to produce cathode rays?

Which row gives the properties of the radiation from radioactive materials?
[Table_1]

In a laboratory, a detector of ionising radiation records an average background count rate of 8 counts per second.
A radioactive source is now placed close to the detector. The count rate on the detector rises to 200 counts per second.
What is the count rate due to radiation from the radioactive source?

$^{14}_{6}\text{C}$ is a nuclide of carbon.
What is the composition of one nucleus of this nuclide?
[Table_1]