Cambridge IGCSE Physics - 0625 - Core Paper 1 2014 Winter Zone 3

A stopwatch is used to time a runner in a race. The diagrams show the stopwatch at the start and at the end of a lap of the race.

How long did the runner take to finish the lap of the race?

The graph shows how the speed of a car changes with time.
Between which two times is the car stationary?

An aeroplane flies from town $X$ to town $Z$, stopping for 1 hour at town $Y$ to pick up more passengers. The distances between the towns are shown in the diagram.

The total time taken between leaving $X$ and arriving at $Z$ is 3 hours.
What is the average speed of the aeroplane in the air?

The mass of an astronaut is 70kg on the Moon. What is the mass of the astronaut on the Earth?

The weight of an object is found using the balance shown in the diagram. The object is put in the left-hand pan and various weights are put in the right-hand pan.

These are the results.
[Table_1]
What is the best estimate of the weight of the object?

Diagram 1 shows an empty measuring cylinder on a balance.
Diagram 2 shows the same measuring cylinder on the balance, but it now contains a liquid.

What is the density of the liquid?

In which situation is no resultant force needed?

The diagram shows a uniform, flat metal sheet hanging freely from a nail at point $A$. A weight also hangs freely on a string tied to $A$.
One of the labelled points is at the centre of mass of the metal sheet.
Which point is at the centre of mass?

When a bicycle lamp is switched on, what is the useful energy change within the battery?

A student does some work by pulling a suitcase along a corridor. She now pulls a second suitcase along the corridor. Which row indicates that the student is now doing twice as much work? [Table_1]

The scale diagram shows three identical blocks, P, Q and R. The blocks have different areas of contact with the ground.

Which block exerts the greatest pressure on the ground?

A manometer is used to measure the pressure of the air in a container.

Which change would give a bigger value of height $h$?

The volume of a gas in a sealed syringe is increased. The temperature of the gas does not change.

After this change is made, what has happened to the gas molecules in the syringe?

Some liquid is poured into a metal dish on a wooden table. The dish, the liquid, the table and the air around the dish are all at the same temperature.
The temperature of the liquid now starts to decrease.
What could cause this temperature decrease?

The diagram shows four labelled changes of state between solid, liquid and gas. Which changes need an energy input?

Equal masses of two different liquids are put into identical beakers. Liquid 1 is heated for 100 s and liquid 2 is heated for 200 s by heaters of the same power. The temperature of both liquids increases by the same amount.
Which statement is correct?

Two methods by which thermal energy can be transferred are conduction and radiation.
Which statement is correct?

A heater is to be fitted in a room to warm the air throughout the room. The diagram shows two possible positions to fit the heater, P and Q.

Which position is better and why?

The diagram shows four waves drawn to the same scale. Which statement is correct?

Waves travel more quickly on the surface of water when the water is deep.
A stone is dropped at point X into a pool of varying depth. The diagram shows the first wavefront on the surface of the pool.
The region between X and which labelled point is likely to be the deepest?

An intruder alarm sensor detects that a human is warmer than his surroundings. Which type of electromagnetic wave does the sensor detect?

Which waves are longitudinal?

An object is placed in front of a converging lens. The lens has a focal length $f$.
In which labelled position should the object be placed in order to produce a real image of the object that is smaller than the object?

Three vibrating objects P, Q and R produce waves in the air of different frequencies as shown.

[Table_1]

Which of these waves can be heard by a human ear?

In an experiment to measure the speed of sound, a student uses a stopwatch to find the time taken for a sound wave to travel from X to Y. She does this six times.
The table shows her results.
[Table_1]
Which value for the time should be used to calculate the speed of sound?

The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn.

The results are as follows.
End Q: attracts end R, attracts end S, attracts end T, repels end U.
Which of the metal rods is a magnet?

The diagram shows two bar magnets, stored with metal keepers across the ends. The keepers help to keep the magnets magnetised.

The material used for the keepers becomes strongly magnetised when placed in contact with the magnets, but does not remain magnetised when taken away from the magnets.
What is a suitable metal to use for the magnets and what is a suitable metal to use for the keepers?

Four wires are made from the same material.
Which wire has the least resistance?
[Table_1]

A $30\Omega$ resistor is connected in series with another resistor and a $6.0V$ battery. The current in the circuit is $0.12A$. A voltmeter is connected across the other resistor.
What is the reading on the voltmeter?

A circuit contains four ammeters A, B, C and D, and three resistors with different values.
Which ammeter shows the largest reading?

The diagram shows a torch containing two cells, a switch and a lamp.

Which is the circuit diagram for the torch?

The diagram shows a circuit with a fixed resistor connected in series with a light-dependent resistor (LDR). A voltmeter is connected across the LDR.

A bright lamp shines light onto the LDR. The lamp is then switched off and this causes the voltmeter reading to change.
Which row shows the change in the resistance of the LDR and the change in the voltmeter reading when the lamp is switched off?
[Table_1]

The current in an electrical heater is 5.0 A.
The heater is connected to the mains by a flexible cable that can carry a current of up to 15 A.
The mains circuit can carry a current of up to 30 A.
Different fuses are available for the heater.
Which fuse is the most suitable?

The diagram shows a thin copper wire in a magnetic field. The current in the wire is from right to left. This causes an upward force on the wire.

The direction of the current and the direction of the magnetic field are both reversed.
In which direction does the force act on the wire, after these changes are made?

A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the circuit while the rod is moving.

Which rod is being inserted?

The diagram shows the structure of a transformer.

Which row shows a suitable material for the primary coil and a suitable material for the core?

In a cathode-ray tube, a hot tungsten cathode releases particles by thermionic emission. What are these particles?

A radioactive source emits three types of radiation R, S, and T.
The diagram shows an experiment set up to study the penetrating properties of R, S, and T.
Which types of radiation are R, S, and T?

The half-life of a radioactive substance is 10 minutes. A sample of the radioactive substance contains 2000 nuclei.
How many radioactive nuclei were in the sample half an hour earlier?

Which statement about the nuclei of all atoms is correct?