0625 Physics November 2025 Question Paper 21

A student determines the diameter of a metal ball. Which apparatus is needed to get an accurate measurement?

An athlete runs at a speed of 8 m / s for 10 s, and then at a speed of 6 m / s for 12 s. Which calculation gives the average speed of the athlete in m / s?

A piece of paper torn out of an exercise book is shown. What is being described?

The diagram shows one liquid floating on top of another liquid. liquid P liquid Q Which statement explains why liquid P floats on top of liquid Q?

A spring has a spring constant k. What is a possible unit for k ?

Which statement about the moment of a force is not correct?

The momentum of a car changes from 10 000 kg m / s to 15 000 kg m / s in a time of 8.0 s. What is the resultant force acting on the car?

A machine is very efficient. What does this mean?

Diagram 1 shows a conical flask containing water. Diagram 2 shows a beaker with the same base area as the flask and containing water of the same depth d. d d diagram 1 diagram 2 water water X P Y Which statement is correct?

A flask with a tight-fitting stopper contains a gas. The gas and flask are initially at room temperature. tight-fitting stopper gas The gas and flask are cooled. Which row describes the average speed of the gas particles and the pressure of the gas as the temperature decreases? average speed of the gas particles pressure of the gas

Brownian motion is the random movement of microscopic particles in a liquid or gas. Which statement about Brownian motion is correct?

The distance between two electricity pylons is 60 m. The cable that connects the two pylons is 62 m in length. Why is the cable longer than the distance between the two pylons?

A glass beaker contains a mass of 0.20 kg of water at a temperature of 20 °C. The specific heat capacity of water is 4200 J / (kg °C). A brass block of mass 0.15 kg is at a temperature of 170 °C. The block is carefully lowered into the beaker of water. The final temperature of both the water and brass is 30 °C. What is the specific heat capacity of the brass? (Assume that no water is lost and no thermal energy has been transferred to the beaker or the surroundings.)

Which statement about convection is not correct?

Iron is a better conductor of thermal energy than rubber. Which statement explains this?

Two metal cans are identical, except that one has a shiny silver outer surface and the other has a dull black outer surface. They each have the same mass of hot water at the same temperature sealed inside them. They are both in a vacuum in the darkness of outer space. How does the temperature of the water in each one change?

A ray of light reflects from a plane mirror. The angle between the incident ray and the surface of the mirror is 35°. Which statement is correct?

Parallel waves in a ripple tank are diffracted as they pass through a gap in a barrier. Three changes that can be made to this arrangement are listed. Decrease the wavelength of the waves. Increase the amplitude of the waves. Decrease the size of the gap. Which changes will cause the shape of the diffracted waves to be less curved?

A beam of light passes through a vacuum and then enters a transparent liquid. The diagram shows the path it takes. 40° 25° vacuum liquid The light travels through the vacuum at a speed of 3.0  108 m / s. What is the speed of light in the liquid?

Which statement about a thin converging lens is correct?

The diagram shows two narrow beams of light, P and then Q, passing through the same prism. Beams P and Q are both incident on the same point on the prism and at the same angle. P Q Which row correctly compares beams P and Q? dispersion nature of light

Ultraviolet radiation and infrared radiation are both parts of the electromagnetic spectrum. However, they differ in wavelength and frequency. Which row describes how they differ? ultraviolet infrared

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies. Which row describes the amplitude and the frequency of the sound? amplitude frequency

The diagram shows part of the magnetic field around two magnets. P R Q P S S N N Which list gives the order of magnetic field strengths at the positions P, Q and R, from weakest to strongest?

A fully charged battery stores a charge of 18 000 C. The battery is charged with a current of 830 mA. How long does it take to fully charge a completely discharged battery?

What is the definition of electromotive force?

A cell passes a current of 2.0 A in a circuit for 30 s. In this time, the cell transfers 120 J of energy. What is the electromotive force (e.m.f.) of the cell?

The diagram shows two resistors in series connected to a power supply. 6.0
R S 12.0 V + – V The reading on the voltmeter is 3.0 V when the switch is closed. What is the resistance of resistor R?

Lamps can be connected in series or in parallel to a power supply. What is an advantage of connecting the lamps in parallel rather than in series?

The lamps on a bicycle are powered by a simple electrical generator. A permanent magnet rotates around a stationary coil of wire wound on an iron core. Which statement is correct?

A current-carrying coil in the magnetic field between the poles of two magnets experiences a turning effect. Which change would decrease the turning effect?

Cables transmit electrical power from the output of the transformer at a power station to the input of another transformer at a substation. transformer at power station transformer at substation cables output input The power at the output of the transformer at the power station is 400 MW. Which situation delivers the most power to the input of the transformer at the substation? potential difference at power station transformer output / kV diameter of cables

Pu 239 is an isotope of plutonium. The nucleus can absorb a neutron and then split to form two other nuclei. Two nuclei that form are gold, Au, 207 and phosphorus, P. In this reaction, neutrons are also produced. What is the number of neutrons produced when the nucleus splits?

Three statements about alpha () particles and beta () particles are listed. The magnitude of the charge on an -particle is twice the charge on a -particle. The mass of an -particle is large compared with the mass of a -particle. The kinetic energy of an -particle is small compared to the kinetic energy of a -particle. Which statements help to explain the different ionising effects of -particles and -particles?

A beta-particle is a fast-moving electron. Which statement explains how beta-particles are emitted from an atom?

Which properties must a radioisotope have for its radiation to make it suitable to kill bacteria in food? half-life type of radiation emitted

A student tries to predict the effect of exposure time on the radiation dose received from a source of ionising radiation. Radiation dose measures the amount of ionising radiation received by a living organism. Which graph shows the correct trend between the variables?

A satellite is in orbit around the Earth. The orbit has radius r and period T. Which expression gives the orbital speed of the satellite?

Comets move round the Sun. Which statement describes the orbit of a comet?

A galaxy is at a distance of 60 million light-years from the Earth. The galaxy is moving away at a speed of 1300 km / s. One light-year is about 9.5  1012 km. There are about 3.2  107 seconds in one year. Which expression can be used to estimate the age of the Universe in years?