IGCSE Physics 0625 Paper 31, May/June 2024

For the graph in Fig. 1.1, match each letter, R, S and T, with the motion at that point. Draw one line from each letter to the correct description. One has been done for you.

Determine the speed of the car at $\text{time}=4.0\text{ s}$. speed = ................................................. $\text{m / s}$

Determine the distance moved by the car from $\text{time}=16.0\text{ s}$ to $\text{time}=20.0\text{ s}$. distance moved = ..................................................... $\text{m}$

Define the term velocity.

The height of the stack of masses is $5.4\text{ cm}$. Calculate the average thickness of one mass. average thickness of one mass = ................................................... $\text{cm}$

Fig. 2.2 shows the masses, a measuring cylinder and a beaker containing some water. The student uses the equipment in Fig. 2.2 to determine the total volume of the six masses. Describe a method that the student uses.

Calculate the resultant horizontal force on the boat in Fig. 3.1. size of resultant force = ........................................................... $\text{N}$ direction of resultant force ...............................................................

Suggest what causes the $80\text{ N}$ force on the boat in Fig. 3.1.

Another boat is travelling and the horizontal forces on this boat are balanced. Describe the horizontal motion of this boat.

Fig. 3.2 shows the wheel used to steer a boat. A force of $60\text{ N}$ acts at a perpendicular distance of $50\text{ cm}$ from the wheel’s pivot. Calculate the moment of the $60\text{ N}$ force about the pivot. Include the unit. moment = ............................................................... unit ...............................................................

State two reasons, apart from cost, for reducing the amount of fossil fuel burned. 1 ................................................................................................................................................ ................................................................................................................................................... 2 ................................................................................................................................................ ...................................................................................................................................................

Describe how a hydroelectric power station generates electrical power.

Hydroelectric power stations are expensive to build. State two other disadvantages of using a hydroelectric power station to generate electrical power. 1 ........................................................................................................................................ ........................................................................................................................................... 2 ........................................................................................................................................ ...........................................................................................................................................

The government plans to build some wind turbines. The government plans to store some of the electrical energy generated by the wind turbines. Suggest one method of storing the electrical energy generated by a wind turbine.

Describe the arrangement, separation and motion of gas particles.

Fig. 5.1 shows some gas in a container with a piston. The piston can move into the container. A force of $30\text{ N}$ pushes the piston into the container for a distance of $0.18\text{ m}$. Calculate the work done by the $30\text{ N}$ force. work done = ...................................................... $\text{J}$

When the piston moves into the container, the temperature of the gas does not change. Describe and explain any change in the pressure on the walls of the container.

Describe how the student can compare the conduction of thermal energy through the rods in Fig. 6.1.

The Bunsen burner emits infrared waves. The infrared waves have a wavelength of $2.0\times {10}^{-6}\text{ m}$. The velocity of the infrared waves is $3.0\times {10}^8\text{ m/s}$. Calculate the frequency of the infrared waves. frequency = .................................................... $\text{Hz}$

State the name of a region of the electromagnetic spectrum which has a wavelength longer than the wavelength of infrared. Give one use of the radiation in this region. region ................................................................................................................ use ....................................................................................................................

Fig. 7.1 shows a ray of light striking a plane mirror. The ray is reflected as shown. The angle of incidence for the ray of light is ${40}^{\circ }$. Indicate the angle of reflection by drawing a letter R on Fig. 7.1.

State the size of the angle of reflection in Fig. 7.1. angle of reflection = ........................................................${}^{\circ }$

An object O is placed to the left of a thin converging lens. ${\text{F}}_1$ is the principal focus on one side of the lens and ${\text{F}}_2$ is the principal focus on the other side of the lens. Two rays from the top of the object are incident on the lens, as shown in Fig. 7.2. On Fig. 7.2, locate the image of O by continuing the path of each ray.

Draw an arrow to represent the image of O.

Fig. 7.3 shows a prism producing a spectrum of colours from a narrow beam of white light. The prism refracts the white light. State the name of the effect that produces a spectrum.

In the spectrum shown in Fig. 7.3, there are seven colours. List the seven colours in the order they appear between X and Z. X ...................................... ...................................... ...................................... ...................................... ...................................... ...................................... Z ......................................

The electromagnet is a temporary magnet. State one material which is suitable for the core of the electromagnet.

The battery is made from cells connected in series. Each cell in the battery has an electromotive force (e.m.f.) of $1.5\text{ V}$. Calculate the number of cells in the battery in Fig. 8.1. number of cells = .........................................................

The switch is closed. The direction of the current in the solenoid is shown in Fig. 8.1. There is a magnetic field around the electromagnet. State the name of a piece of equipment that can show the direction of a magnetic field.

State the name of the pole labelled X on the core of the electromagnet.

The resistance of the solenoid is $8.0\mathrm{\Omega }$. The current in the solenoid is $1.2\text{ A}$. Calculate the potential difference (p.d.) across the solenoid. p.d. = ...................................................... $\text{V}$

Fig. 9.1 shows the power cable for connecting a desktop computer to the mains electricity circuit. State the name of each of the three wires inside the power cable. 1 ........................................................................................................................................ 2 ........................................................................................................................................ 3 ........................................................................................................................................

The cable is designed for a maximum current of $13\text{ A}$. Suggest one hazard due to a current of $30\text{ A}$ in the cable.

There is a transformer in the desktop computer. The input voltage to the primary coil $V_p$ is $230\text{ V}$ (a.c.). The number of turns on the primary coil $N_p$ is $720$. The number of turns on the secondary coil $N_s$ is $50$. Calculate the output voltage $V_s$ of the secondary coil. secondary coil output voltage $V_s$ = ...................................................... $\text{V}$

The current in the input coil of the transformer is $1.4\text{ A}$. Calculate the input power to the desktop computer. input power = ..................................................... $\text{W}$

Calculate the number of neutrons in one nucleus of strontium-90. number of neutrons = .........................................................

Determine the number of electrons in one atom of strontium-90. number of electrons = .........................................................

Strontium-90 decays by emitting $\beta$-particles (beta-particles). Describe the nature of $\beta$-particles.

Strontium-90 decays with a half-life of 29 years. A sample contains $16\text{ mg}$ of strontium-90. Calculate the time taken for the strontium-90 to decay until only $2.0\text{ mg}$ of strontium-90 remains in the sample. time = ............................................... years

The Sun is the star in our Solar System. Eight planets orbit the Sun. State the names of two other categories of bodies in the Solar System. 1 ................................................................................................................................................ 2 ................................................................................................................................................

State the name of the galaxy that includes our Solar System.

Describe how the light from distant galaxies gives evidence to support the Big Bang Theory.