CAIE A Level 9702

Physics 2022 · Oct/Nov

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Questions & Model Answers 46 Qs

Q1(a)

Short Answer 1 mark

State what is meant by work done.

Q1(b)

Short Answer 1 mark

Use the answer to

Q1(b)(a)

Short Answer 1 mark

to determine the SI base units of power. SI base units

Q1(c)

Short Answer 1 mark

The maximum useful output power P of a car travelling on a horizontal road is given by where v is the maximum speed of the car and b is a constant. For the car, and b = 0.56 ± 7% in SI units.

Q1(i)

Short Answer 2 marks

Calculate the value of v. v = m s

Q1(ii)

Short Answer 1 mark

Determine the absolute uncertainty in the value of v. absolute uncertainty = m s [2] [Total: 7]

Short Answer 1 mark

A spherical balloon is filled with a fixed mass of gas. A small block is connected by a string to the balloon, as shown in Fig. 2.1. balloon block string ground Fig. 2.1 (not to scale) The block is held on the ground by an external force so that the string is vertical. The density of the air surrounding the balloon is 1.2 kg m . The upthrust acting on the balloon is 0.071 N. The upthrust acting on the string and block is negligible.

Q2(a)

Short Answer 2 marks

By using Archimedes' principle, calculate the radius r of the balloon. r = m

Q2(b)

Short Answer 3 marks

The total weight of the balloon, string and block is 0.053 N. The external force holding the block on the ground is removed so that the released block is lifted vertically upwards by the balloon. Calculate the acceleration of the block immediately after it is released. acceleration = m s

Q2(c)

Short Answer 1 mark

The balloon continues to lift the block. The string breaks as the block is moving vertically upwards with a speed of 1.4 m s . After the string breaks, the detached block briefly continues moving upwards before falling vertically downwards to the ground. The block hits the ground with a speed of 3.6 m s Assume that the air resistance on the block is negligible.

Q2(i)

Short Answer 2 marks

By considering the motion of the block after the string breaks, calculate the height of the block above the ground when the string breaks. height = m

Q2(ii)

Short Answer 1 mark

The string breaks at time t = 0 and the block hits the ground at time t = T. On Fig. 2.2, sketch a graph to show the variation of the velocity v of the block with time t from t = 0 to t = T. Numerical values of t are not required. Assume that v is positive in the upward direction.- 1- 2- 3- 4 v/ m s [2] [Total: 9]

Q3(a)

Short Answer 1 mark

State what is meant by the centre of gravity of an object.

Q3(b)

Short Answer 1 mark

A uniform beam AB is attached by a frictionless hinge to a vertical wall at end A. The beam is held so that it is horizontal by a metal wire CD, as shown in Fig. 3.1. 45 N37° wire block 23 N W 0.56 m 0.20 m0.20 m wall hinge Fig. 3.1 (not to scale) The beam is of length 0.96 m and weight 23 N. A block of weight W rests on the beam at a distance of 0.20 m from end B. The wire is attached to the beam at point D which is a distance of 0.40 m from end B. The wire exerts a force on the beam of 45 N at an angle of 37° to the horizontal. The beam is in equilibrium.

Q3(i)

Short Answer 1 mark

Calculate the vertical component of the force exerted by the wire on the beam. vertical component of the force = N

Q3(ii)

Short Answer 3 marks

By taking moments about A, calculate the weight W of the block. W = N

Q3(iii)

Short Answer 1 mark

The hinge exerts a force on the beam at end A. Calculate the horizontal component of this force. horizontal component of force = N

Q3(iv)

Short Answer 1 mark

The block is now placed closer to point D on the beam. State whether this change will increase, decrease or have no effect on the tension in the wire.

Q3(v)

Short Answer 1 mark

The stress in the wire is 5.3 × 10 Pa. The wire is now replaced by a second wire that has a radius which is three times greater than that of the original wire. The tension in the wire is unchanged. Calculate the stress in the second wire. stress = Pa [2] [Total: 9]

Short Answer 1 mark

A horizontal spring is fixed at one end. A block is pushed against the other end of the spring so that the spring is compressed, as shown in Fig. 4.1. compressed spring block frictionless surface The block is released and accelerates along a horizontal frictionless surface as the spring returns to its original length. The block leaves the end of the spring with a speed of 2.3 m s , as shown in Fig. 4.2. spring block leaving the spring speed 2.3 m s The block has a mass of 250 g and the spring has a spring constant of 420 N m Assume that the spring always obeys Hooke's law and that all the elastic potential energy of the spring is transferred to the kinetic energy of the block.

Q4(a)

Short Answer 2 marks

Calculate the kinetic energy of the block as it leaves the spring. kinetic energy = J

Q4(b)

Short Answer 2 marks

Calculate the compression of the spring immediately before the block is released. compression = m

Q4(c)

Short Answer 1 mark

After leaving the spring, the block moves along the surface until it hits a barrier at a speed of 2.3 m s . The block then rebounds at a speed of 1.5 m s and moves back along its original path. The block is in contact with the barrier for a time of 0.086 s. Calculate:

Q4(i)

Short Answer 2 marks

the change in momentum of the block during the collision change in momentum = N s

Q4(ii)

Short Answer 1 mark

the average resultant force exerted on the block during the collision. average resultant force = N

Q4(d)

Short Answer 1 mark

The maximum compression x of the spring is now varied in order to vary the kinetic energy E of the block as it leaves the spring. Assume that all the elastic potential energy in the spring is always transferred to the kinetic energy of the block. On Fig. 4.3, sketch a graph to show the variation with x of E [1] [Total: 8]

Q5(a)

Short Answer 1 mark

Two progressive sound waves meet to form a stationary wave. The two waves have the same amplitude, wavelength, frequency and speed. State the other condition that must be fulfilled by the two waves in order for them to produce the stationary wave.

Q5(b)

Short Answer 1 mark

A stationary wave is formed on a string that is stretched between two fixed points A and B. Fig. 5.1 shows the string at time t = 0 when each point is at its maximum displacement.A B Distance AB is 0.80 m. The period of the stationary wave is 0.016 s.

Q5(i)

Short Answer 2 marks

On Fig. 5.1, sketch a solid line to show the position of the string:

Q5(ii)

Short Answer 3 marks

Determine the speed of a progressive wave along the string. speed = m s

Q5(c)

Short Answer 1 mark

A beam of vertically polarised light of intensity I is incident normally on a polarising filter that has its transmission axis at 30° to the vertical, as shown in Fig. 5.2.30° intensity I intensity I intensity I vertically polarised incident light beam, transmitted beam, transmitted beam, polarising filter with transmission axis at 30° to the vertical second polarising filter with transmission axis at 90° to the vertical The transmitted light from the first polarising filter has intensity I . This light is then incident normally on a second polarising filter that has its transmission axis at 90° to the vertical. The transmitted light from the second filter has intensity I Calculate:

Q5(i)

Short Answer 2 marks

the ratio =

Q5(ii)

Short Answer 1 mark

the ratio = [2] [Total: 10]

Q6(a)

Short Answer 1 mark

Define electric potential difference.

Q6(b)

Short Answer 1 mark

A battery is connected to two resistors X and Y, as shown in Fig. 6.1.X Y The resistance of resistor X is greater than the resistance of resistor Y. State and explain which resistor dissipates more power.

Q6(c)

MCQ 1 mark

A battery of electromotive force (e.m.f.) 9.0 V and internal resistance r is connected to two resistors P and Q, as shown in Fig. 6.2. 4.5 A 9.0 V A total charge of 650 C moves through resistor P in a time interval of 540 s. During this time resistor P dissipates 4800 J of energy. The current in resistor Q is 4.5 A. Assume that the e.m.f. of the battery remains constant. Calculate:

battery of electromotive force (e.m.f.) 9.0 V and internal resistance r is connected to two

total charge of 650 C moves through resistor P in a time interval of 540 s. During this time

Q6(i)

Short Answer 2 marks

the current in resistor P current = A

Q6(ii)

Short Answer 2 marks

the potential difference across resistor P potential difference = V

Q6(iii)

Short Answer 1 mark

the internal resistance r of the battery. r = Ω [2] [Total: 10]

Q7(a)

Short Answer 1 mark

Describe the structure of an atom of uranium-238,

Q7(b)

Short Answer 3 marks

The decay of uranium-238 is shown by the equation Th + X. For nucleus X, calculate the ratio, in C kg , of charge mass ratio = C kg

Q7(c)

Short Answer 1 mark

Two particles P and Q each consist of three quarks. These quarks are up

Q7(c)(u)

Short Answer 1 mark

or down

Q7(c)(d)

Short Answer 1 mark

quarks. Particle P has no overall charge. Particle Q has an overall charge of +2e, where e is the elementary charge. State the quark composition of:

Q7(i)

Short Answer 1 mark

particle P

Q7(ii)

Short Answer 1 mark

particle Q. [Total: 7] Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.

Paper Details

Board	CAIE
Level	A Level
Subject	Physics
Code	`9702`
Year	2022
Session	Oct/Nov
Q&A	46 questions

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This CAIE A Level Physics paper focuses strongly on mechanics and waves, with a good spread of energy, moments, forces, momentum, circular motion-style reasoning, and basic materials ideas such as stress and strain. Students can expect structured questions with several linked parts, where one calculation leads into the next, along with short definition-style questions, graph-sketching, and interpretation of physical situations from diagrams. The difficulty is moderate to challenging because it tests not just recall of formulas, but also correct use of SI units, uncertainty, sign conventions, and clear application of principles such as Archimedes’ principle, moments, conservation of energy, and momentum.

To prepare well, practise full worked calculations with units shown at every step, revise key definitions word-for-word, and make sure you can draw and interpret graphs such as velocity-time and stationary-wave patterns. It is also very useful to do timed past-paper practice, because many questions reward careful reading, logical progression, and accurate handling of data rather than just memorising facts.

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