Cambridge IGCSE Physics - 0625 - Core Paper 1 2015 Summer Zone 2

The diagram shows four identical spheres placed between two wooden blocks on a ruler.

What is the diameter of one sphere?

What does the area under a speed-time graph represent?

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?

The diagram shows a uniform beam being used as a balance. The beam is pivoted at its centre. A 1.0 N weight is attached to one end of the beam. An empty pan weighing 0.2 N is attached to the other end of the beam.
How many 0.1 N weights must be placed on the pan in order to balance the beam?

A metal block has the dimensions shown. Its mass is 1000 g.
What is the density of the metal?

The diagrams show four identical objects. Each object is acted on by only the three forces shown. Which object accelerates to the right, with the smallest acceleration?

Different weights are hung from a spring. The diagram shows the original length of the spring, and the lengths when different weights are added.
The extension of the spring is directly proportional to the weight hung from it.
What is the weight of W?

Which source of energy involves the splitting of heavy atoms?

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 stone suspended under the surface of a liquid from a string. The stone experiences a pressure caused by the liquid.
What would increase the pressure on the stone?

The diagram shows a simple mercury barometer, used to measure atmospheric pressure.
Atmospheric pressure decreases. Which row states what happens to the pressure at point P and what happens to the level L?

Puddles of rain water remain after a storm. The water in the puddles gradually evaporates.
How does the evaporation affect the temperature of the water remaining in the puddle, and how does it affect the average speed of the remaining water molecules in the puddle?
[Table_1]

The diagram represents moving gas molecules in a sealed container of fixed volume.
The temperature of the gas is now increased.
What happens to the pressure of the gas, and what happens to the speed of the gas molecules?
[Table_1]

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

Two metal blocks X and Y are at room temperature. Each block is heated so that its temperature rises by 10°C.

The blocks are now allowed to cool back to room temperature.

Block Y has a greater thermal capacity than block X.

Which block needs more thermal (heat) energy to heat it up by 10°C and which block loses more thermal (heat) energy as it cools back to room temperature?

[Table_1]

The diagram shows a vacuum flask used to keep liquid hot.
How does thermal energy pass through the vacuum?

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? [Table_1]

The diagrams show two water waves P and Q that are travelling at the same speed on the surface of a pond. The diagrams are to the same scale.

Which wave has the greater amplitude and which wave has the greater frequency?

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

An object is placed in front of a thin converging lens. The diagram shows the paths of two rays from the top of the object. An image of the object is formed on a screen to the right of the lens. How does this image compare with the object?

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?

A quiet sound is produced by a loudspeaker. The loudness of the sound is increased. Which property of the sound wave is increased?

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?

Which group contains only non-ferrous metals?

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. 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?

A student has wires of different lengths and different diameters. The wires are all made of the same metal. The student measures the resistance of one wire.
Which wire has a greater resistance than the wire he has measured?

The circuit diagram shows a 4.0Ω resistor and an 8.0Ω resistor connected to a 6.0V battery.
What is the potential difference (p.d.) across the 4.0Ω resistor?

Diagram 1 shows two thin, uncharged strips of plastic.
Diagram 2 shows the same strips after they have been rubbed with a dry cloth.

Which row describes the charge on the strips after rubbing, and the force between the strips after rubbing?

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?

Two 5.0 \Omega resistors are connected as shown in the diagram.
What is the total resistance of this combination?

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?

An e.m.f. is induced across a wire when it moves through the magnetic field between the poles of a magnet.
Which electrical device operates because of this effect?

The diagram shows a flat, rectangular coil placed between the poles of a magnet. There is a current in the coil that makes it turn in the direction shown in the diagram.



Which change would make the coil turn in the opposite direction?

A transformer has 1000 turns on its primary coil. An input voltage of 12V is applied to the primary coil, and an output voltage of 120V is induced across the secondary coil. How many turns are on the secondary coil of the transformer?

The diagram shows a cathode-ray tube.
The tube is not working properly.
Which change should be made so that the tube works properly to produce a continuous beam of cathode rays?

Which statement about $\alpha$-radiation is correct?

A radioactive source produces a count rate on a detector of 1600 counts/s. After 32 hours the count rate has fallen to 100 counts/s. Both count rates have been corrected for background radiation. What is the half-life of the source?

A nuclide has the symbol $^{22}_{10}\text{Ne}$.
What is the proton number of a nucleus of this nuclide?