IGCSE Physics 0625 Paper 31, May/June 2025

Complete the following sentence. The car has the largest acceleration in section ............................... .

Calculate the distance travelled by the car between $\text{time}=20\text{ s}$ and $\text{time}=35\text{ s}$. distance travelled = ..................................................... m

Describe the motion of the car during: section LM

section MN.

Another car travels a distance of $500\text{ m}$ in a time of $20\text{ s}$. Calculate the average speed of this car. average speed = ................................................. m/s

State the time taken for one complete oscillation. Use the information in Fig. 2.1. time for one complete oscillation = ...................................................... s

Another student uses a different pendulum and measures the time for 15 complete oscillations. The time for 15 complete oscillations is $11.7\text{ s}$. Calculate the average time for one complete oscillation. average time for one complete oscillation = ...................................................... s

Fig. 2.2 represents a pendulum. P and Q are the extreme positions of the pendulum bob. R is the position of the bob when the string is vertical. A student holds the pendulum bob at P and then releases it. Describe the movement of the pendulum bob during one complete oscillation of the pendulum. You may draw on Fig. 2.2 as part of your answer.

The mass of the wooden beam is $40\text{ kg}$. Calculate the weight of the wooden beam. weight of beam = ..................................................... N

Two children balance the wooden beam horizontally on a log. The wooden beam pivots on the log to make the see-saw. Fig. 3.1 shows the children on the see-saw. The see-saw balances horizontally, as shown in Fig. 3.1. The weight of child B is $360\text{ N}$. Calculate the weight $W$ of child A. State and use the principle of moments in your answer. weight $W$ of child A = ..................................................... N

The weight of the load is $15\text{ N}$. The load is raised a vertical distance of $0.80\text{ m}$. Calculate the work done on the load. work done on load = ...................................................... J

Describe one way in which energy is wasted as the electric motor lifts the load.

A hydroelectric power station generates electrical power using the energy stored in water behind a dam. Describe how a hydroelectric power station generates electrical power.

A student uses the apparatus in Fig. 5.1 to compare how different surfaces absorb infrared radiation. There are two metal containers. One has a dull black surface and the other has a shiny white surface. Before heating, the air inside the metal containers is at the same temperature. The Bunsen burner flame is the same distance from each metal container. The Bunsen burner flame emits infrared radiation and heats the metal containers for three minutes. Explain the difference between the temperatures of the air inside the two metal containers after heating for three minutes.

A teacher has some equipment for comparing thermal conductivity. The teacher has four metal rods and one glass rod. The metals are brass, copper, iron and steel. All five rods are the same size and shape. Describe how the teacher may use the rods to compare the thermal conductivity of the five materials. You may draw a labelled diagram as part of your answer.

Fig. 6.1 represents a ray of red light travelling into and through a glass block. State the name of the dashed line labelled line Y in Fig. 6.1.

On Fig. 6.1, label the angle of incidence for the ray of red light at point P. Use the letter X.

The ray of red light travels from the glass into the air at point P. On Fig. 6.1, draw the path for the ray of red light after it leaves the glass at point P.

Fig. 6.2 represents a converging lens that is forming the image of an object. Use the information on Fig. 6.2 to determine the focal length of the lens. focal length of lens = ................................................... cm

State two characteristics of the image in Fig. 6.2.

A transverse wave passes through a medium. Fig. 7.1 shows the displacement of particles in the medium. Using the information in Fig. 7.1, determine: the amplitude of the wave amplitude of wave = ................................................... cm

the frequency of the wave. frequency of wave = .................................................... Hz

Fig. 7.2 shows the regions of the electromagnetic spectrum in order of increasing frequency. Two of the regions are not labelled. Complete the chart in Fig. 7.2 by adding the names of the missing regions.

The speed of yellow light is $3.0\times {10}^8\text{ m/s}$. The wavelength of yellow light is $5.8\times {10}^{-7}\text{ m}$. Calculate the frequency of yellow light. frequency = .................................................... Hz

Calculate the combined resistance of the two resistors shown in Fig. 8.1. combined resistance = ..................................................... $\mathrm{\Omega }$

The potential difference across the $8.0\mathrm{\Omega }$ resistor is $2.0\text{ V}$. Calculate the current in the resistor. current = ...................................................... A

State the name of the particles that move through the metal wires when there is a current in the circuit.

A student measures the potential difference across the $16\mathrm{\Omega }$ resistor by using a meter. On Fig. 8.1, draw the electrical symbol for this meter and its connections.

The power input to the router circuit is $9.0\text{ W}$. The potential difference across the router circuit is $12\text{ V}$. Calculate the current in the router circuit. current in router circuit = ...................................................... A

The energy used by the router each hour is $0.0090\text{ kWh}$. One unit ($\text{kWh}$) of energy costs 50 cents. Calculate the cost of using the router for 24 hours. cost for 24 hours = ............................................... cents

The router uses a transformer. The number of turns $N_{\mathrm{p}}$ on the primary coil of the transformer is 3600. The primary voltage $V_{\mathrm{p}}$ to the transformer is $240\text{ V}$. The secondary voltage $V_{\mathrm{s}}$ of the transformer is $12\text{ V}$. Calculate the number of turns $N_{\mathrm{s}}$ on the secondary coil of the transformer. number of turns on secondary coil = .........................................................

The mains plug for the router includes a fuse that protects the router. Explain how a fuse works.

Table 10.1 describes four nuclides. Determine which two nuclides have the same number of nucleons.

Determine which nuclide has the largest number of neutrons.

Plutonium-241 has a half-life of 14 years. A sample of radioactive material contains $72\text{ mg}$ of plutonium-241. Calculate the mass of plutonium-241 remaining in the sample after 42 years. mass of plutonium-241 remaining = ................................................... mg

The Solar System includes the Sun and eight planets. State the name of the force that keeps the planets in orbit around the Sun.

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

State the meaning of the term light-year.

Describe the evidence for an expanding Universe.