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This page covers Questions and Worked Solutions for Physics 9702 Paper 12 March 2022, 9702/12.

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March 2022 Physics 9702 Paper 12 (pdf)

- What could not be a measurement of a physical quantity?
- A computer memory stick is labelled as having a storage capacity of 128GB. The letter B stands for byte, which is a unit. What is the equivalent storage capacity?
- A man of mass 75.2 kg uses a set of weighing scales to measure his mass three times. He obtains the following readings. Which statement describes the precision and accuracy of the weighing scales?
- Which statement about scalar and vector quantities is correct?
- How can the acceleration of an object be determined?
- A sprinter takes a time of 11.0 s to run a 100 m race. She first accelerates uniformly from rest, reaching a speed of 10 m s–1. She then runs at a constant speed of 10 m s–1 until the finish line. What is the uniform acceleration of the sprinter for the first part of the race?
- A single horizontal force F is applied to a block X which is in contact with a separate block Y, as
shown.

The blocks remain in contact as they accelerate along a horizontal frictionless surface. Air resistance is negligible. X has a greater mass than Y. Which statement is correct? - A car of mass 750 kg has a horizontal driving force of 2.0 kN acting on it. It has a forward
horizontal acceleration of 2.0 m s
^{–2}. - An object falls freely from rest in a vacuum. The graph shows the variation with time t of the velocity v of the object. Which graph, using the same scales, represents the object falling in air?
- A rock of mass 2m, travelling in deep space at velocity v, explodes into two parts of equal mass, one of which is then stationary. What is the kinetic energy of the moving part after the explosion?
- A horizontal metal bar PQ of length 50.0 cm is hinged at end P. The diagram shows the metal bar viewed from above. Two forces of 16.0 N and 5.0 N are in the horizontal plane and act on end Q, as shown. What is the resultant moment about P due to the two forces?
- A cube WXZY has sides of length 2.0 cm and mass 24.0 g. The cube rests on a metre rule of negligible mass. The geometrical centre of the cube is vertically above the 70.0 cm mark on the scale of the rule.The cube has a non-uniform density so that its centre of gravity is not at its geometrical centre. The centre of gravity of the cube is in the plane of the diagram. The rule rests on a pivot at the 50.0 cm mark. A mass of 23.4 g is placed vertically above the 30.0 cm mark. The rule is horizontal and in equilibrium. What can be determined about the position of the centre of gravity of the cube?
- A rigid sphere is held at rest on the sea bed. When the sphere is released, it rises to the surface of the sea. The seawater has a uniform density. Which statement about the sphere, from its release until it reaches the surface, is correct?
- What is a unit for density?
- The total energy input Ein in a process is partly transferred to useful energy output U and partly transferred to energy that is wasted W. What is the efficiency of the process?

- An escalator is 60 m long and lifts passengers through a vertical height of 30 m, as shown.
To drive the escalator against the forces of friction when there are no passengers requires a
power of 2.0 kW.
The escalator is used by passengers of average mass 60 kg and the power to overcome friction
remains constant.
How much power is required to drive the escalator when it is carrying 20 passengers and is
travelling at 0.75 m s
^{–1}? - A rock of mass 40 kg is released from rest from a height of 20 m above the surface of a planet. The rock has a kinetic energy of 32 kJ when it hits the surface of the planet. The planet does not have an atmosphere. What is the weight of the rock on the surface of the planet?
- A metal wire is stretched. The wire obeys Hooke’s law. Which quantity has a value that does not change?
- An object is stretched until it reaches the elastic limit. Which statement must describe the stress on the object when it is at the elastic limit?
- Which statement about progressive waves is correct?
- A cathode-ray oscilloscope (CRO) is used to determine the frequency of a sound wave. The diagram shows the waveform on the screen.
- The warning signal on an ambulance has a frequency of 600 Hz. The speed of sound is 330 m s–1. The ambulance is travelling with a constant velocity of 25 m s–1 towards an observer. The ambulance passes, and then moves away from the observer with no change in velocity. Which overall change in observed frequency takes place between the times at which the ambulance is a long way behind the observer and when it is a long way in front of the observer?
- Brief pulses of red, blue and green light are emitted from the Sun at the same time. The pulses travel the same distance to reach Mars. Assume that the pulses travel in a vacuum for the full duration of their journey. In which order would these pulses of light arrive at Mars?
- Two coherent progressive waves from different sources meet at a point. Which condition must be satisfied for there to be zero resultant amplitude at the point where the waves meet?
- A corridor is 13.2 m long and has closed doors that reflect sound at both ends. The speed of
sound in the air in the corridor is 330 m
^{–1}. What is the lowest frequency of sound that could create a stationary wave in the corridor with a node halfway along it? - Water waves of wavelength λ are formed in a ripple tank. The waves are diffracted as they pass through a narrow gap of width d (d is greater than λ). Which gap width and which wavelength will cause the largest decrease in the amount of diffraction?
- Two loudspeakers X and Y emit sound waves that are in phase and of wavelength 0.75 m. An observer O is able to stand anywhere on a straight line that passes through X and Y, as shown. The observer stands at a point where the sound waves from X and Y meet in phase. What could be the distances OY and XY?
- Light of a single wavelength is incident normally on a diffraction grating. The resulting diffraction pattern is displayed on a screen. Which change makes the first orders of intensity maxima further apart from each other on the screen?
- For a current-carrying wire, the current can be calculated using the equation shown.
- The number of free electrons passing a point in a wire in 24 hours is 6.0 × 10
^{23}. What is the average current in the wire? - In the circuit shown, lamp P is rated 250V, 50W and lamp Q is rated 250V, 200W. The two lamps are connected in series to a 250V power supply. Assume that the resistance of each lamp remains constant. Which statement most accurately describes what happens when the switch is closed?
- A piece of wire has a length of 0.80 m and a diameter of 5.0 x 10
^{–4}m. The I–V characteristic of the wire is shown. What is the resistivity of the metal from which the wire is made? - Ten cells, each of electromotive force (e.m.f.) 1.5V, are connected together, as shown.
- A cell of electromotive force (e.m.f.) E and internal resistance r is connected to a variable resistor, as shown.
- Each of Kirchhoff’s two laws presumes that some quantity is conserved. Which row states Kirchhoff’s first law and names the quantity that is conserved?
- A cell has an electromotive force (e.m.f.) of 8.0V and negligible internal resistance. The cell forms part of a circuit, as shown.
- In the circuit shown, the cells have negligible internal resistance and the reading on the galvanometer is zero.
- When α-particles are directed at gold leaf:
- A nucleus X is radioactive and decays into a nucleus Y. X and Y are isotopes of the same element. Which combination of particles could have been emitted during the decay process?
- A positively charged meson consists of a quark and an antiquark. What could be the quark and antiquark?

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