Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2014 Summer Zone 3

Which instrument is used to compare the masses of objects?
A a balance
B a barometer
C a manometer
D a measuring cylinder

The graph shows how the speed of a car changes with time. [Image_1: Graph showing speed in m/s (14) over time in s (0 to 24)] Which calculation gives the distance travelled by the car in 24 seconds? A. \( \left(\frac{14}{24}\right) \text{m} \) B. \( \left(\frac{24}{14}\right) \text{m} \) C. \( \left(\frac{24 \times 14}{2}\right) \text{m} \) D. \( (24 \times 14) \text{m} \)

Which distance/time graph represents the motion of an object moving at constant speed?

A student wishes to measure accurately the volume of approximately 40 cm$^3$ of water. She has two measuring cylinders, a larger one that can hold 100 cm$^3$, and a smaller one that can hold 50 cm$^3$. The water forms a meniscus where it touches the glass.

Which cylinder should the student use and which water level should she use to ensure an accurate result?

[Table_1]
| cylinder | water level |
|-------------|----------------------|
| A | larger one | bottom of meniscus |
| B | larger one | top of meniscus |
| C | smaller one | bottom of meniscus |
| D | smaller one | top of meniscus |

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. What has he plotted on the vertical axis?
A measured length
B original length
C (measured length + original length)
D (measured length – original length)

A liquid has a volume of 100cm$^3$ and a mass of 85g.
The density of water is 1.0g/cm$^3$.
How does the density of the liquid compare with the density of water?
A. Its density is higher than that of water.
B. Its density is lower than that of water.
C. Its density is the same as that of water.
D. It is impossible to say with only this data.

Which situation is an example of a force acting over a large area to produce a small pressure?
A. a builder hammering a nail into a piece of wood
B. a cook using a sharp knife to cut vegetables
C. a nurse pushing a needle into a patient's arm
D. a soldier marching in flat-soled boots

A student places four identical beakers on a bench.
Two beakers contain salt water of density $1.1 , ext{g/cm}^3$ and two beakers contain pure water of density $1.0 , ext{g/cm}^3$.
Which beaker exerts the greatest pressure on the bench?
[Image: A, B, C, D with respective volumes and types of water]

A plane lamina with centre of mass X touches the ground at point P.
Which diagram shows the lamina in equilibrium?
[Image_1: Diagrams A, B, C, D with angles and positions as shown]

Four cars are driven along a road. The table shows the work done by the engine in each car and the time taken by each car. Which engine produces the most power?

[Table_1]

| work done by engine / J | time taken / s |
|------------------------|---------------|
| A 50 000 | 20 |
| B 50 000 | 40 |
| C 100 000 | 20 |
| D 100 000 | 40 |

Which energy transfer takes place when a matchstick burns?

A. chemical to thermal
B. chemical to nuclear
C. nuclear to chemical
D. thermal to chemical

The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown.
Which row shows how the heat energy from the heater reaches the thermometer bulb?
[Table_1]: \[ \begin{array}{|c|c|c|c|} \hline & \textbf{conduction} & \textbf{convection} & \textbf{radiation} \\ \hline A & \text{yes} & \text{yes} & \text{no} \\ B & \text{yes} & \text{no} & \text{yes} \\ C & \text{no} & \text{yes} & \text{no} \\ D & \text{no} & \text{no} & \text{yes} \\ \hline \end{array} \]

Which statement about the transfer of thermal energy is correct?
A All metals conduct thermal energy equally well.
B Convection can only occur in solids or liquids.
C Convection occurs in liquids because hot liquid is more dense than cold liquid.
D The radiation that transfers thermal energy is a type of electromagnetic radiation.

In an experiment, a thermometer is placed in a test-tube of hot liquid. The temperature of the liquid is recorded every half minute. The table shows the results.

[Table_1]

time/minutes | 0.0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 | 6.5 | 7.0 | 7.5
temperature/°C | 73 | 65 | 59 | 55 | 55 | 55 | 51 | 48 | 45 | 42 | 40 | 38 | 36 | 35 | 34 | 33

What is the melting point of the substance?

A 0°C B 33°C C 55°C D 73°C

A telephone engineer connects a wire between two poles when the weather is very cold. He makes the wire very loose. The wire passes over a road.

The weather changes and it becomes very hot. What could happen to the wire and why?

| what could happen | why |
|-----------------------------------|---------------|
| A: it breaks | it contracts |
| B: it breaks | it expands |
| C: it sags and touches cars on the road | it contracts |
| D: it sags and touches cars on the road | it expands |

During evaporation, molecules escape rapidly from the surface of a liquid.

What happens to the average energy of the molecules of the remaining liquid and what happens to the temperature of the remaining liquid?

[Table_1]

A student places his thumb firmly on the outlet of a bicycle pump, to stop the air coming out.

What happens to the pressure and what happens to the volume of the trapped air as the pump handle is pushed in?

A boy blows a whistle that has a frequency of 10000 Hz. The boy's friend cannot hear the sound from the whistle. The friend has normal hearing.

What could be a reason why he cannot hear the sound? A The amplitude is too large.
B The amplitude is too small.
C The frequency is too high.
D The frequency is too low.

A lighted candle is placed in front of a loudspeaker that is making a loud, steady note. The candle flame vibrates because of the sound wave. Which type of waves are sound waves and in which direction does the flame vibrate?
[Table_1:
| type of wave | direction of vibration |
|:---:|:---:|
| A | longitudinal |
| |
↔|

| B | transverse | ↕

| C | longitudinal | ↔
| D | transverse | ← → |]

Which list shows electromagnetic waves in order of increasing frequency?

A visible light, X-rays, $\gamma$-rays
B visible light, $\gamma$-rays, X-rays
C X-rays, $\gamma$-rays, visible light
D $\gamma$-rays, X-rays, visible light

A small boat in a harbour is protected from waves on the sea by harbour walls.

Some waves can curve round the harbour walls and reach the boat.
What is the name of this effect?
A diffraction
B dispersion
C reflection
D refraction

Scout P signals to scout Q on the other side of a valley by using a mirror to reflect the Sun's rays.
Which mirror position would allow the Sun's rays to be reflected to scout Q?
A.
B.
C.
D.

Which statement about a converging lens is not correct?
A. A ray parallel to the principal axis of the lens is refracted through the principal focus.
B. All rays of light refracted by the lens pass through the principal focus.
C. The distance between the centre of the lens and the principal focus is the focal length.
D. The principal focus of the lens is a point on the principal axis.

Rays of light enter and leave a box.

What could be inside the box to make the rays behave as shown?
A a converging lens
B a parallel-sided glass block
C a plane mirror
D a triangular prism

A plastic rod and a dry cloth are uncharged.
The rod is now rubbed with the cloth and they both become charged. The rod becomes negatively charged because some charged particles move from the cloth to the rod.
What is the charge on the cloth and which particles moved in the charging process?

[Table_1]

The diagram shows a circuit containing three lamps and three switches $S_1$, $S_2$ and $S_3$.

Lamp 1 and lamp 3 are lit, but lamp 2 is not lit.
Which switch or switches is/are closed?
A $\quad S_1$ only
B $\quad S_1$ and $S_2$
C $\quad S_1$ and $S_3$
D $\quad S_2$ and $S_3$

Which labelled component in the circuit shown controls the brightness of lamp X?

The diagram shows part of an electric circuit.

The light falling on the light-dependent resistor (LDR) increases in brightness.
What happens to the resistance of the LDR and what happens to the reading on the voltmeter?

The diagram shows an incomplete circuit.
Four wires of different length and thickness are connected in turn between point X and point Y.
All four wires are made of the same metal.
Which wire will cause the greatest reading on the ammeter?
A long and thick
B long and thin
C short and thick
D short and thin

The diagram shows a circuit containing a battery, a lamp, a switch and another component X.
The switch is initially closed and the lamp is lit.
The switch is now opened and the lamp remains lit for several seconds before slowly going out.

What is component X?
A. a capacitor
B. a light-dependent resistor
C. a thermistor
D. a variable resistor

An appliance is connected to a mains supply. Its circuit also contains a switch and a fuse. Which circuit shows the fuse in the correct position?

Two iron nails hang from a bar magnet.

Which diagram shows the magnetic poles induced in the nails?

A steel magnet is placed inside a coil of wire. There is a large alternating current in the coil. The magnet is slowly moved out of the coil to position P.

How has the steel changed, if at all, when it reaches position P?

A. It has become a stronger magnet.
B. It has become demagnetised.
C. The poles have changed ends.
D. There has been no change.

When a wire is moved upwards between the poles of a magnet, an electromotive force (e.m.f.) is induced across the ends of the wire. [Image_1: Diagram showing a wire moving upwards through a magnetic field] Which device uses a moving wire to induce an e.m.f? A. a cathode-ray tube B. a generator C. a transformer D. an electromagnet

An electric current is passed through a coil of wire.

Which diagram shows the shape of the magnetic field produced in the middle of the coil?
A

B

C

D

An input voltage of 10V is supplied to the primary coil of a transformer. An output voltage of 40V is produced across the secondary coil.

The 10V supply at the primary coil is now replaced with a 40V supply.

What is the new output voltage across the secondary coil?

A 10V
B 40V
C 70V
D 160V

A lithium nucleus contains 3 protons and 4 neutrons.
What is its nuclide notation?
A $^3_4 ext{Li}$ B $^4_3 ext{Li}$ C $^7_3 ext{Li}$ D $^7_4 ext{Li}$

The diagram shows a box used for storing radioactive sources.

Which material is best for lining the box to prevent the escape of most radioactive emissions?
A aluminium
B copper
C lead
D steel

The table shows the results of an experiment to find the half-life of a radioactive substance.
[Table_1]

What is the half-life of the substance?
A. 60 seconds
B. 120 seconds
C. 180 seconds
D. 240 seconds

A beam of cathode rays passes between two parallel metal plates connected to a high-voltage d.c. power supply.

Which path does the beam follow?