Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2021 Summer Zone 1

The diagram shows a stone of irregular shape.
Which property of the stone can be found by lowering it into a measuring cylinder half-filled with water?

Which row describes speed and velocity?
[Table_1]

Four balls with different masses are dropped from the heights shown. Air resistance may be ignored.
Which ball has the smallest average speed?

An object of mass 2.0 kg is taken from the Earth, where the gravitational field strength is 10 N/kg, to the Moon, where the gravitational field strength is 1.6 N/kg.
Which row is correct?
[Table_1]

The mass of an empty flask is 34 g.
The volume of liquid added to the flask is $20 \ \text{cm}^3$.
The total mass of the flask and the liquid is 50 g.
What is the density of the liquid?

The extension–load graph for a spring is shown. The unstretched length of the spring is 17.0 cm. When an object is suspended from the spring, the length of the spring is 19.2 cm. What is the weight of the object?

A cart has a mass of 10 kg. A boy pushes on the cart horizontally with a force of 50 N. The cart accelerates at 0.50 m/s^2.
What is the frictional force acting on the cart?

A ball has a mass of 2.0 kg. The ball approaches a wall at a speed of 3.0 m/s and rebounds at a speed of 1.0 m/s.

What is the impulse on the wall?

Which situation involves no work being done and no energy being transferred?

A student suggests that there are several ways of transferring energy to a small, stationary block of iron on a smooth table. He makes the following suggestions.
1. Heat it.
2. Shine light on it.
3. Pass a current through it.
Which suggestions are correct?

An engine produces 240 kJ of energy in 2.0 minutes.
What is the power output of the engine?

A book has a mass of 400g.
The surface of the book in contact with a table has dimensions 0.10 m × 0.20 m.
The gravitational field strength $g$ is 10 N/kg.
What is the pressure exerted on the table due to the book?

The diagram shows a mercury barometer.
At which point is the pressure greater than atmospheric pressure?

The table gives information about molecules. Which row describes a gas?

[Table_1: force between molecules and distance between molecules]

Very small pollen grains are suspended in water. A bright light shines from the side.
When looked at through a microscope, small specks of light are seen to be moving in a random, jerky manner.

What are the moving specks of light?

Why are small gaps left between the metal rails of a railway track?

A block of metal absorbs 2000 J of thermal energy.
The temperature of the block rises from 10°C to 20°C.
The mass of the block is 2.0 kg.
What is the specific heat capacity of the metal?

Which statement about boiling and evaporation is correct?

A metal rod is heated at end X.

Why does end Y of the metal rod become hot?

Two square sheets of metal, P and Q, are heated to the same temperature. The metal sheets are shown.
Sheet Q is emitting more radiation than sheet P.
Which statement explains this?

A water wave passes into a region where the wave travels more slowly.
As it passes into the slow region, what happens to the frequency and what happens to the wavelength of the wave?
[Table_1]

Light travelling at a speed of $3.0 \times 10^8 \text{ m/s}$ strikes the surface of a glass block and undergoes refraction as it enters the block. The diagram shows a ray of this light before and after it enters the block. What is the speed of light in the glass?

The diagram shows a narrow beam of light incident on a glass-air boundary. Some of the light emerges along the surface of the glass and some is reflected back into the glass.

[Image_1: A diagram showing a beam of light at a glass-air boundary with an angle \( \theta \)].

Which row is correct?

[Table_1: A table with two columns - 'this is an example of total internal reflection' and 'angle \( \theta \) is the critical angle' - and four rows labeled A, B, C, D with 'yes' and 'no' entries.]

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?

A remote-controlled vehicle is travelling on the surface of a planet. The vehicle senses an obstacle ahead. It sends a radio message to the control room from where it is being controlled. The control room is $2.4 \times 10^6$ km away from the vehicle. The control room sends a message back to the vehicle telling it to stop.
What is the minimum time that elapses between the vehicle sensing the obstacle and receiving the message back from the control room?

A sound wave is travelling outwards from a loudspeaker into the surrounding air. Here are three statements.
1. The air pressure is lower at a rarefaction compared with undisturbed air.
2. The density of the air is less at a compression compared with undisturbed air.
3. The distance from a compression to a rarefaction equals half a wavelength.
Which statements about the sound wave are correct?

The sound from a loudspeaker must pass through two materials to reach a microphone.



Which combination of materials gives the shortest time for the sound to reach the microphone?

[Table_1: material 1 - air, copper, water; material 2 - hydrogen, aluminium, oil]

Diagram 1 shows a small compass needle with its poles marked. It is not near any magnetic materials.
Diagram 2 shows a bar magnet with its poles marked. The compass needle is placed at point P.

In which direction will the N pole of the compass needle point?

A student rubs a plastic rod with a cloth.
The rod becomes positively charged.
What has happened to the rod?

An isolated metal sphere is positively charged. It is then brought near to another isolated metal sphere that is neutral.



What happens to the charges on the neutral sphere as the positively charged sphere is brought close to it?

Which statement about the resistance of a metal wire is correct?

The circuit diagram shows a light-dependent resistor (LDR) in a potential divider.

A voltmeter is connected across the LDR.
Which row shows the resistance of the LDR and the potential difference (p.d.) shown on the voltmeter at a specific light level?

Three NAND gates are connected in a single chip as shown.
The whole chip behaves as a single logic gate.
Which type of logic gate does the chip act as?

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 solenoid while the rod is moving.

Which rod is being inserted?

The diagram shows an electric generator with the coil in a vertical position.
Which row describes the generator?

The diagram shows a transformer. There are 460 turns on the primary coil and 24 turns on the secondary coil. The primary voltage is 230 V.
What is the secondary voltage?

The charge on a proton is e.
What is the charge on an electron and what is the charge on a neutron?
[Table_1]

Four students are asked to comment on the processes of nuclear fission and nuclear fusion. Their comments are recorded in the table. Which row is correct? [Table_1]

Radon \(^ {219}_{86} \text{Rn} \) decays by emitting an \( \alpha \)-particle.
Which nuclide is formed in this decay?

The graph shows the activity of a radioactive source over a period of time.

What is the half-life of the source?