Cambridge IGCSE Physics - 0625 - Supplement Paper 2 2021 Summer Zone 3

The diagram shows a plastic rod alongside a ruler.

What is the length of the rod?

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

A cyclist rides 300 m up a slope in 50 s.
She then rides down the slope in 25 s.
What is her average speed for the whole journey?

An object is on the surface of the Earth. Which statement describes the weight of the object?

The tank shown has the dimensions $5.0 \, \text{m} \times 4.0 \, \text{m} \times 4.0 \, \text{m}$. It is completely filled with water of density $1000 \, \text{kg/m}^3$.

What is the mass of water in the tank?

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 car of mass 1200 kg is travelling along a horizontal road.
shows the car with a total frictional force of 1000 N acting in the direction opposite to the driving force of 4000 N.
What is the acceleration of the car?

Object X moves to the right along a frictionless surface towards a stationary object Y, as shown.

They make a noise as they collide and then both objects move to the right.
Which equation is correct?

A stream flows out of a lake and down the side of a hill.
What best describes the change in energy stores?

The energy input to a device is $E$. The amount of energy wasted by the device is $W$. Which expression gives the efficiency of the device?

A builder lifts 30 bricks from the ground onto a platform 2.0 m high. Each brick has a mass of 4.0 kg. What is the work done against gravity by the builder in lifting the bricks onto the platform?

A book has a mass of 400 g.
The surface of the book in contact with a table has dimensions 0.10 m \times 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 tank full of water.
The mass of water in the tank is $m$.
The density of the water is $\rho$.
The height of water in the tank is $h$.
Which equation gives the pressure $p$ due to the water at the bottom of the tank?

A liquid at room temperature is put on a metal surface which is also at room temperature. A student blows gently across the liquid and its temperature decreases. What causes the liquid to become cooler?

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?

The liquid level in a thermometer rises when the thermometer is placed in hot water. What causes this?

A student calculates the energy needed to raise the temperature of an aluminium block from 50\(^\circ\)C to 60\(^\circ\)C.
He then does an experiment to measure the energy used to do this.
Which statement about the measured energy is correct?

Which row correctly describes a liquid that is boiling? [Table_1]

Three students are planning an experiment to test thermal conduction in different materials.
The students each propose a hypothesis.

1. I think the copper rod will be a good thermal conductor because it is a metal.

2. I think the glass rod will be a good thermal conductor because it has free electrons which vibrate and transfer energy quickly.

3. I think the wooden rod will be a poor thermal conductor because it can only transfer energy along the rod by vibrating the lattice particles.

Which of their hypotheses are correct?

A copper plate is shiny on one side and is painted dull black on the other side. The plate is heated to a high temperature. A person places his hands at equal distances from either side of the plate, close to the plate, but not touching it.
Why does the hand near the dull black surface of the plate feel much hotter than the hand near the shiny surface?

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?

A beam of light is monochromatic. What does monochromatic mean?

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?

Which row correctly describes what happens to the frequency and to the speed of electromagnetic waves as we move through the spectrum from γ-rays to radio waves?
[Table_1]

The diagram shows a model of a sound wave passing through air in an open tube.

What is the region Q?

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?

A bar magnet picks up two steel bolts. Which diagram shows the magnetic poles induced in the bolts?

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?

The diagram shows a circuit containing a cell, two resistors, a switch and a voltmeter.
When the switch is open the voltmeter reads 1.5 V.
When the switch is closed the voltmeter reads 2.0 V.
What is the electromotive force (e.m.f.) of the cell?

A 4.0Ω resistor and a 12Ω resistor are connected in parallel.
[Image_1: A diagram showing two resistors, 4.0Ω and 12Ω, connected in parallel]
What is the effective resistance of this combination of resistors?

Which combination of two gates will result in the truth table shown?
[Table_1]

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?

A 12V, 36W lamp shines at normal brightness when connected to a mains transformer.
Assume the transformer is 100% efficient.

Which row shows the number of turns in the secondary coil and the current in the mains wires?
[Table_1]

Diagram 1 shows a wire carrying an electric current into the page. The wire is between the poles of a magnet. A force is produced on the wire acting down towards the bottom of the page.
Diagram 2 shows the situation after the current is reversed and the magnet is turned through 90°.



In which direction does the force act after these changes?

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

The diagram shows $\alpha$-particles incident on a thin metal foil.

How does the motion of these particles give evidence for the nuclear atom?

Radium-226, $^{226}_{88}\text{Ra}$, is an \(\alpha\)-emitter.
It is implanted inside cancerous tumours.
It is safe to use as it kills the cancerous cells, but not the healthy ones surrounding the tumour.
Which properties of \(\alpha\)-particles, compared to other emissions, enable this use of radium-226?
[Table_1]

The graph shows the activity of a radioactive source over a period of time.
What is the half-life of the source?