Cambridge IGCSE Physics - 0625 - Core Paper 1 2019 Summer Zone 2

Diagram 1 shows a measuring cylinder containing water. A metal weight with a cork attached by a thread is held above the water.
Diagram 2 shows the apparatus after the weight has been lowered into the water.
Diagram 3 shows the apparatus after the weight and the cork have been submerged.



What is the volume of the cork?

A car travels at constant speed. Which pair of graphs show how the distance travelled by the car and how the car’s speed vary with time? [Graph A], [Graph B], [Graph C], [Graph D]

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.

The times taken to fall from one level to the next are measured.
Where is the speed of the ball greatest and which time is shortest?

Which row contains two correct statements about the mass and the weight of an object? [Table_1]

The table gives approximate values of the acceleration due to gravity and the atmospheric pressure on three planets.

[Table_1]

A body has a mass of 10 kg on Earth.

Which statement about the weight of the body is correct?

A metal has a density of $8.0 \text{ g/cm}^3$. A solid cube of mass $1.0 \text{ kg}$ is made from this metal.
How long is each side of the cube?

Which object is in equilibrium?

A spring is suspended from a stand. Loads are added and the extensions are measured.
Which graph shows the result of plotting extension against load?

A wooden bar is pivoted at its centre so that it can rotate freely. Two equal forces $F$ are applied to the bar. In which diagram is the turning effect greatest?

A machine is very efficient. What does this mean?

An object falls under gravity.
What happens to the gravitational potential energy and to the kinetic energy of the object?
[Table_1]

A student is testing four different electric motors. He measures the time it takes for a motor to lift either a heavy load or a light load through a height of 1 metre.

He makes a similar measurement for the other three motors. The table shows his results.
Which motor produces the most power?
[Table_1]

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

A sample of mercury is heated.
In which states of matter will its volume increase as its temperature rises?

When water evaporates, what escapes from the surface of the water?

The resistance of a resistor varies linearly with temperature as shown on the graph.
Which statement is correct?

A night storage heater contains a large block of material that is heated electrically during the night. During the day the block cools down, releasing thermal energy into the room.
Which thermal capacity and which night-time temperature increase will cause the most energy to be stored by the block?

Which row describes the process of condensation?
[Table_1]

The metal surface of a kettle is hot.
What happens to the cool air outside the kettle when it comes into contact with the hot kettle?

Vacuum flasks usually have silvered walls that help to keep the contents of the flask hot.
Why are the walls silvered?

The diagrams show graphs of displacement against time for four waves. All the graphs are drawn to the same scale.
Which wave has the largest amplitude and the highest frequency?

The diagram shows a cork with a weight attached so that the cork floats upright in water.
Transverse waves travel across the water from X to Y.
In which direction do the waves make the cork move?

Which conditions are necessary for light to be totally internally reflected?
[Table_1]

Which diagram shows the dispersion of white light by a glass prism?

The diagram shows radiation from a lamp passing through a prism.
Which type of radiation is found at P?

A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is reflected from a shoal of fish. The sound reaches the boat again after 1.2 s. The speed of sound in the water is 1500 m/s.

How far below the bottom of the boat is the shoal of fish?

An observer stands at the finish line of a 100 m race. He wants to time the winner's run. He starts his stop-watch as soon as he sees the smoke from the starting gun instead of when he hears the bang. What is the reason for doing this?

A soft iron bar is a long way from any magnetic field.
How can the material of the bar be described?

An iron ball on a horizontal wooden table rolls near the north pole of a bar magnet which is lying on the table.
Which diagram shows the most likely path of the ball, as seen from above the table?

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?

An ammeter and a voltmeter are used to determine the resistance of a resistor.
Which circuit diagram shows the ammeter and the voltmeter correctly connected?

The diagram shows a circuit.

What is connected in parallel with the thermistor?

The circuit shows a relay being used to operate a mains lamp.
Two ammeters are labelled P and Q.

The variable resistor is used to vary the current in the relay coil. The mains lamp switches on when there is a large enough current in the relay coil.
The graph shows how the reading on ammeter Q changes as the reading on ammeter P increases.

What is the minimum current needed in the relay coil to switch on the mains lamp?

A lamp is to be connected in a circuit so that the potential difference (p.d.) across it can be varied from 0 to 6V.
Which circuit would be most suitable?

Which components are designed to improve the safe working of a mains electrical supply?
[Table_1]

A bar magnet is held near a solenoid. The coil is connected to a galvanometer. The magnet is moved into the coil of wire and then held stationary inside the coil. Which graph shows how the induced electromotive force (e.m.f.) varies with time?

A wire XY lies between the poles of a magnet. The diagram shows the upward force on the wire XY caused when there is an electric current in the direction XY as shown. Three tests are made using this apparatus.
1. The current direction is reversed.
2. The N and S poles are swapped around.
3. The current is switched off.
Which will result in no change in the size of the force on the wire?

A simple model of the atom consists of small particles orbiting a central nucleus.
Which row is correct?[Table_1]

Which statement explains the meaning of the half-life of a radioactive isotope?

The diagram shows a lead-lined box used for storing radioactive sources.
Why is the inside of the box lined with lead?