Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2015 Summer Zone 3

A cook wants to prepare some food to be cooked by 1.15 p.m. He uses an oven with an automatic timer that can be set to switch on and off at certain times. The oven needs to be switched on for 2 hours 10 minutes.

At which time does the oven need to switch on?
A 11.05 a.m. B 11.25 a.m. C 3.05 p.m. D 3.25 p.m.

The speed-time graph shows the motion of a car.

Which row describes the motion?
[Table_1]

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?

A 40 km/h B 50 km/h C 60 km/h D 120 km/h

Weight is an example of which quantity?
A. acceleration
B. force
C. mass
D. pressure

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

What is the density of the metal?
A $\left( \frac{5 \times 10}{1000 \times 2} \right) \text{g/cm}^3$
B $\left( \frac{2 \times 5 \times 10}{1000} \right) \text{g/cm}^3$
C $\left( \frac{1000 \times 2}{5 \times 10} \right) \text{g/cm}^3$
D $\left( \frac{1000}{2 \times 5 \times 10} \right) \text{g/cm}^3$

A car travels along a horizontal road at a constant speed. Three horizontal forces act on the car. The diagram shows two of these three forces.
What is the size and the direction of the third horizontal force acting on the car?
A 1200N backwards
B 1200N forwards
C 1800N backwards
D 1800N forwards

The extension-load graph for a spring is shown. The unstretched length of the spring is 17.0 cm.



When an object is hung from the spring, the length of the spring is 19.2 cm.

What is the weight of the object?

A 1.4 N B 1.6 N C 2.6 N D 3.0 N

To calculate the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power?

[Table_1]

| | the distance the force moves the object | the time for which the force acts on the object |
|------------------|-----------------------------------------|------------------------------------------------|
| A | ✓ | ✓ |
| B | ✓ | ✗ |
| C | ✗ | ✓ |
| D | ✗ | ✗ |

key
✓ = needed
✗ = not needed

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?
A gravitational potential \( \rightarrow \) kinetic \( \rightarrow \) thermal (heat)
B gravitational potential \( \rightarrow \) thermal (heat) \( \rightarrow \) kinetic
C kinetic \( \rightarrow \) gravitational potential \( \rightarrow \) thermal (heat)
D kinetic \( \rightarrow \) thermal (heat) \( \rightarrow \) gravitational potential

The diagram shows a manometer with one side connected to a gas cylinder and the other side open to the atmosphere.

Which conclusion can be made using only the information from liquid levels in the manometer?
A. The density of the gas is less than the density of air.
B. The density of the gas is greater than the density of air.
C. The pressure of the gas is less than atmospheric pressure.
D. The pressure of the gas is greater than atmospheric pressure.

The diagram shows a solid block resting on a bench. The dimensions of the block are shown.
On which labelled surface should the block rest to produce the smallest pressure on the bench?
A P
B Q
C R
D any of P, Q or R

Small smoke particles suspended in air are viewed through a microscope.
The smoke particles move randomly.
What does this show?
A The air consists of fast-moving molecules.
B The pressure of the air is increasing.
C There are convection currents in the air.
D The temperature of the air is increasing.

Molecules escape from a liquid during evaporation. The temperature of the remaining liquid changes.
Which molecules escape and how does the temperature change?

[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?
A in a freezer
B in pure boiling water
C in pure cold water
D in pure melting ice

A solid is heated from room temperature. The graph shows how its temperature changes with time as it is heated constantly.
[Graph Image: temperature vs time with points P, Q, R, S, T]
Between which labelled points on the graph is the substance partly solid and partly liquid?
A between P and Q
B between Q and R
C between R and S
D between S and T

One method of heat transfer involves the energy travelling at a much greater speed than in other methods.

What is the name of this method?

A conduction
B convection
C evaporation
D radiation

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]

What is the frequency of a wave?
A. the distance that a wavefront travels every second
B. the distance from one wavefront to the next
C. the number of wavefronts produced per second
D. the time taken for a wavefront to pass a certain point

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

Which diagram shows how the light from a candle is reflected by a mirror, and shows the position of the image formed?

A: [Image_A]
B: [Image_B]
C: [Image_C]
D: [Image_D]

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?

[Table_1]

The frequency of a musical note is increased. A student hearing the sound detects an increase in which property?
A loudness of the sound
B pitch of the sound
C speed of the sound wave
D wavelength of the sound wave

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) 160 m/s
B) 320 m/s
C) 640 m/s
D) 1280 m/s

Which action will demagnetise a magnetised piece of steel?
A. Cool it in a freezer for several hours.
B. Hit it repeatedly with a hammer.
C. Put it in a coil carrying a direct current (d.c.).
D. Put it near an unmagnetised piece of iron.

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?

What is the unit of electromotive force (e.m.f)?
A. ampere
B. newton
C. ohm
D. volt

Which sample of copper wire has the greatest electrical resistance?
[Table_1]

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 8.0Ω resistor?
A 0A
B 0.50A
C 0.75A
D 1.0A

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?

[Table_1]

Which component is represented by this circuit symbol?

A. a bell
B. a fuse
C. a relay
D. a transformer

The diagram shows a 10Ω resistor and a 20Ω resistor connected in a potential divider circuit.
What is the reading on the voltmeter?
A 4.0V B 6.0V C 8.0V D 12.0V

In the circuit shown, only one of the fuses has blown, but none of the lamps is lit.
Which fuse has blown?

A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments.



In experiment 1, the magnet is attracted to the coil.
Which row shows what happens in the other two experiments?

[Table_1]

Which diagram represents the voltage output of a simple a.c. generator?

A transformer has 400 turns on its secondary 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 primary coil of the transformer?
A. 12 B. 40 C. 400 D. 4000

The diagram shows a cathode-ray tube.

Which electrode should be heated, and which electrode should be positive?
[Table_1]

α, β and γ-radiations are emitted by radioactive substances.
Which statement is correct?
A. α-radiation consists of charged particles and is the most highly ionising radiation.
B. β-radiation consists of charged particles and is the most penetrating radiation.
C. β-radiation consists of uncharged particles and is the least highly ionising radiation.
D. γ-radiation consists of uncharged particles and is the least penetrating radiation.

The nucleus of an americium atom contains 146 neutrons and 95 protons. It decays by emitting an $\alpha$-particle.

How many neutrons and how many protons remain in the nucleus when this form of americium decays?

[Table_1]

Which statement is correct for the nucleus of \textit{any} atom?
A. The nucleus contains electrons, neutrons and protons.
B. The nucleus contains the same number of protons as neutrons.
C. The nucleus has a total charge of zero.
D. The nucleus is very small compared with the size of the atom.