Physics 2024 Oct/Nov | Past Paper

Q1

Short Answer 1 mark

A metal wheel consists of an axle A, eight spokes and a rim, as shown in Fig. 1.1. spoke axle Arim Point X is on the rim at the end of one of the spokes. The rim has a radius of 0.85 m. The wheel is rotating clockwise with an angular speed of 140 rad s

Q1(a)

Short Answer 1 mark

For point X, determine:

Q1(i)

Short Answer 2 marks

the speed speed = m s

Q1(ii)

Short Answer 1 mark

the centripetal acceleration. acceleration = m s [2] * 0000800000004 *

Q1(b)

Short Answer 1 mark

There is a uniform magnetic field of flux density 0.18 T into the plane of the page.

Q1(i)

Short Answer 1 mark

State Lenz's law of electromagnetic induction.

Q1(ii)

Short Answer 1 mark

Show that the time taken for point X to complete one revolution is 45 ms.

Q1(iii)

Short Answer 3 marks

Calculate the magnetic flux cut by spoke AX during one revolution of the wheel. Give a unit with your answer. magnetic flux = unit

Q1(iv)

Short Answer 2 marks

Determine the magnitude of the electromotive force (e.m.f.) induced across spoke AX. induced e.m.f. = V

Q1(v)

Short Answer 1 mark

Use Lenz's law to explain whether the potential is higher at end A or end X of the spoke. [Total: 13] * 0000800000005 *

Q2

Short Answer 1 mark

The Sun may be considered as a uniform sphere with a mass of 1.99 × 10 kg and a surface temperature of 5780 K. A probe with a mass of 2.63 kg moves in a straight line towards the Sun. When it is at a distance x from the centre of the Sun, the probe measures the grav itational field strength g due to the Sun and the radiant flux intensity F of radiation from the Sun.

Q2(a)

Short Answer 1 mark

Define gravitational field.

Q2(b)

Short Answer 1 mark

For the position of the probe where x = 1.47 × 10

Q2(i)

Short Answer 2 marks

calculate g g = N kg

Q2(ii)

Short Answer 2 marks

determine the gravitational potential energy E of the probe. = J

Q2(c)

Short Answer 1 mark

(i) Show that, for any particular value of x, the numerical values of g and F are related byg = 4πGM where M is the mass of the Sun, L is the luminosity of the Sun and G is the gravitational constant. [3] * 0000800000006 *

Q2(ii)

Short Answer 2 marks

Fig. 2.1 shows the variation of g with F. 0 0.5 1.0 1.5 F / 10W m g / 10 N kg 2.0 Determine a value for the luminosity L of the Sun. Give a unit with your answer . L = unit

Q2(iii)

Short Answer 1 mark

Use your answer in (c)(ii) to determine the radius r of the Sun. r = m [2] [Total: 12] * 0000800000007 *

Q3(a)

Short Answer 1 mark

Define specific latent heat.

Q3(b)

Short Answer 1 mark

A dish containing 7.2 × 10 of a substance rests on a laboratory bench. The substance is initially a liquid of density 710 kg m . Atmospheric pressure is 1.0 × 10Pa. The liquid is heated at its boiling point so that it completely vaporises. The increase in the internal energy of the substance during this process is 17.6 kJ. The final volume of the vapour is 0.017 m

Q3(i)

Short Answer 2 marks

Show that the magnitude of the work done on the substance when it vaporises is 1.7 kJ.

Q3(ii)

Short Answer 2 marks

Use the information in (b)(i) to calculate the thermal energy Q, in kJ, supplied to the substance to cause it to vaporise. Q = kJ

Q3(iii)

Short Answer 1 mark

Use your answer in (b)(ii) to determine a v alue for the specific latent heat of vaporisation , in kJ kg , of the substance. = kJ kg [2] * 0000800000008 *

Q3(c)

Short Answer 1 mark

The substance in

Q3(c)(b)

Short Answer 1 mark

has a specific latent heat of fusion L Suggest and explain whether L is likely to be less than, the same as, or greater than the answer in

Q4(a)

Short Answer 3 marks

State three of the basic assumptions of the kinetic theory of gases. 1 2 3

Q4(b)

Short Answer 1 mark

Explain how molecular movement causes the pressure exerted by a gas. 0 100 200 300 T / K Fig. 4.1 * 0000800000010 * Fig. 4.2 shows the variation with T of the product pV for samples of the two gases, where p is the pressure of the gas and V is the volume of the gas. 0 100 200 300 T / K pV / 10 State three conclusions about the gases and their samples that may be drawn from Fig. 4.1 and Fig. 4.2. The conclusions may be qualitative or quantitative. Use the space below for any working that you need. 1 2 3 [3] [Total: 9] * 0000800000011 *

Q5

Short Answer 1 mark

Fig. 5.1 shows a pendulum consisting of a metal sphere suspended by a thin string. thin string metal sphere oscillations Fig. 5.1 (not to scale) The sphere undergoes small oscillations about its equilibrium position. The oscillations may be considered to be simple harmonic. Fig. 5.2 shows the variation with time t of the displacement x of the sphere from its equilibrium position. -0.02 x / m -0.01 0.01 0.02 0 0.2 0.4 0.6 t / s 0.8 1.0 1.2

Q5(a)

Short Answer 1 mark

On Fig. 5.1, draw an arrow , from the centre of the sphere, to represent the direction of the resultant force acting on the sphere when it is in the position shown. [1] * 0000800000012 *

Q5(b)

Short Answer 1 mark

The mass of the sphere is 0.15 kg.

Q5(i)

Short Answer 1 mark

State the amplitude of the oscillations. amplitude = m

Q5(ii)

Short Answer 2 marks

Determine the angular frequency of the oscillations. angular frequency = rad s

Q5(iii)

Short Answer 2 marks

Calculate the total energy of the oscillations. total energy = J

Q5(c)

Short Answer 1 mark

On Fig. 5.3, sketch the variation with x of the kinetic energy E of the sphere. x / m -0.02 -0.01 0 0.01 0.02 / 10 [3] [Total: 9] * 0000800000013 *

Q6(a)

Short Answer 1 mark

State Coulomb's law.

Q6(b)

Short Answer 3 marks

Fig. 6.1 shows an isolated hollow conducting sphere that is positively charged.+ + On Fig. 6.1, draw field lines to represent the electric field outside the sphere.

Q6(c)

Short Answer 1 mark

Fig. 6.2 shows the variation of the electric field strength E with distance x from the centre of the sphere in

Q6(c)(b)

Short Answer 1 mark

. x / cm 0 2 4 6 8 E / 10N C Fig. 6.2 * 0000800000014 *

Q6(i)

Short Answer 1 mark

Determine the radius, in cm, of the sphere. radius = cm

Q6(ii)

Short Answer 3 marks

Calculate the charge on the sphere. charge = C

Q6(iii)

Short Answer 1 mark

Suggest an explanation for the fact that the electric field inside the sphere is zero. [Total: 10] * 0000800000015 *

Q6(b)

Short Answer 1 mark

An initially uncharged capacitor X, of capacitance C, is gradually charged so that the final potential difference (p.d.) between its plates is V and the final charge is Q.

Q6(i)

Short Answer 2 marks

On Fig. 7.1, sketch the variation of charge with p.d. for capacitor X as the p.d. increases from 0 to V. charge p.d.

Q6(ii)

Short Answer 1 mark

Determine an expression, in terms of Q and V, for the work W done on capacitor X during the charging process. Explain your reasoning. W = [2] * 0000800000016 *

Q6(c)

Short Answer 1 mark

Another capacitor Y is initially uncharged. The fully charged capacitor X in

Q6(c)(b)

Short Answer 1 mark

is now connected to capacitor Y, as shown in Fig. 7.2. The capacitance of capacitor Y is 3C.

Q6(i)

Short Answer 3 marks

Complete Table 7.1 to show expressions, in terms of Q and V, for the final p.d.s across, and the final charges on, the two capacitors. Use the space below for any working that you need. Table 7.1X Y final p.d. final charge

Q6(ii)

Short Answer 1 mark

State whether the total energy stored in the two capacitors is less than, the same as, or greater than the energy initially stored in capacitor X. [Total: 10] * 0000800000017 *

Q8(a)

Short Answer 1 mark

State what is meant by the frequency of an alternating current. I = 3.5 sin (40π t) where I is in A and t is in s.

Q8(i)

Short Answer 1 mark

Show that the period of the alternating current is 50 ms.

Q8(ii)

Short Answer 1 mark

On Fig. 8.1, sketch the variation of I with t between t = 0 and t = 100 ms.- 4 I / A 0 25 50 75 t / ms [3] * 0000800000018 * r.m.s. current = A

Q8(c)

Short Answer 1 mark

Use data from

Q8(c)(b)

Short Answer 1 mark

, including your answer in

Q9

Short Answer 1 mark

Electrons in a vacuum are accelerated from rest through a potential dif ference (p.d.) V to form a beam. The electrons each have mass m and charge q. The beam is incident on a graphite crystal that acts as a dif fraction grating. After passing through the crystal, the beam reaches a fluorescent screen. An interference pattern is observed on this screen.

Q9(a)

Short Answer 1 mark

Explain what this observation shows about the nature of electrons.

Q9(b)

Short Answer 3 marks

Determine an expression, in terms of m, q and V, for the momentum p of an electron in the beam. p =

Q9(c)

Short Answer 1 mark

The p.d. through which the electrons are accelerated is now increased to a greater value. Describe and explain the effect of this change on the interference pattern observed.

Q9(d)

Short Answer 1 mark

The electrons are now accelerated through dif ferent values of V, resulting in pairs of corresponding values for p and the de Broglie wavelength λ .

Q9(i)

Short Answer 2 marks

On Fig. 9.1, sketch the variation of p with

Q9(ii)

Short Answer 1 mark

State the name of the quantity represented by the gradient of the line in Fig. 9.1. [Total: 9] * 0000800000021 * BLANK PAGE * 0000800000022 *

Q10(a)

Short Answer 1 mark

Radioactive decay is both random and spontaneous.

Q10(i)

Short Answer 1 mark

State what is meant by random.

Q10(ii)

Short Answer 1 mark

State what is meant by spontaneous.

Q10(iii)

Short Answer 1 mark

State one piece of evidence for the random nature of decay.

Q10(b)

Short Answer 1 mark

(i) Describe the differences between nuclear fission and nuclear fusion.

Q10(ii)

Short Answer 1 mark

Explain, with reference to the variation of binding energy per nucleon with nucleon number, why the processes of nuclear fission and nuclear fusion both result in a release of energy. [Total: 8] * 0000800000023 * reasonable ef fort 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. 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. * 0000800000024 *

Board	CAIE
Level	A Level
Subject	Physics
Code	`9702`
Year	2024
Session	Oct/Nov
Q&A	66 questions

Physics 2024 · Oct/Nov

Questions & Model Answers 66 Qs

Paper Details