OXFORD UNIVERSITY PRESS NEW SENIOR SECONDARY PHYSICS …

New Senior Secondary Physics at Work (Second Edition)

Mock Exam Paper 1A 1

© Oxford University Press

OXFORD UNIVERSITY PRESS

NEW SENIOR SECONDARY PHYSICS AT WORK

(SECOND EDITION)

MOCK EXAMINATION

PHYSICS PAPER 1

Time allowed: 2 hours 30 minutes

This paper must be answered in English

GENERAL INSTRUCTIONS

(1) There are TWO sections, A and B, in this Paper. You are advised to finish Section A in about 50 minutes.

(2) Section A consists of multiple-choice questions in this question paper, while Section B contains

conventional questions printed separately in Question-Answer Book B.

(3) Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section B

should be written in the spaces provided in the Question-Answer Book. The Answer Sheet for Section

A and the Question-Answer Book for Section B will be collected separately at the end of the

examination.

(4) The diagrams in this paper are NOT necessarily drawn to scale.

(5) The last two pages of this question paper contain a list of data, formulae and relationships which you may

find useful.

INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)

(1) Read carefully the instructions on the Answer Sheet. After the announcement of the start of the

examination, you should first insert the information required in the spaces provided. No extra time will be

given after the ‘Time is up’ announcement. (2) When told to open this book, you should check that all the questions are there. Look for the words ‘END

OF SECTION A’ after the last question. (3) All questions carry equal marks. (4) ANSWER ALL QUESTIONS. You are advised to use an HB pencil to mark all the answers on the

Answer Sheet, so that wrong marks can be completely erased with a rubber. You must mark the answers

clearly; otherwise you will lose marks if the answers cannot be captured. (5) You should mark only ONE answer for each question. If you mark more than one answer, you will

receive NO MARKS for that question. (6) No marks will be deducted for wrong answers.




Section A

There are 33 questions. Questions marked with * involve knowledge of the extension component.

1 The following figure shows the central processing unit (C.P.U.) of a computer. A heat sink and

a fan are installed on the unit to help it lose heat.

fan

heat sink

(silver-coloured)

conductive paste

C.P.U.

What are the main processes of heat transfer facilitated by the heat sink and the fan

respectively?

silvered heat sink fan

A conduction convection

B conduction radiation

C radiation convection

D radiation radiation

2 A cup of hot drink is cooled by immersing the cup into an ice bath.

Which of the following is NOT an advantage of using an ice bath?

A Ice absorbs heat without increasing its temperature when melting.

B Water has a high specific heat capacity.

C The ice is not put into the drink, so it will not lower the concentration of the drink when

melted.

D Ice can be stored at a very low temperature.




*3 Mary blows up a balloon. The balloon is then heated gently by placing it near a warm object.

Which of the following statements about the balloon are correct? Assume the pressure in the

balloon is kept constant.

(1) The average kinetic energy of the air molecules in the balloon is increasing.

(2) The volume of the balloon is increasing.

(3) The number of bombardments by air molecules per unit area per unit time on the inner

wall of the balloon is decreasing.

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)

4 As shown in the following figure, a ball X is hung at the middle of a light string with its two

ends fixed on two walls. The string makes an angle of 80° with the vertical at both ends.

80° 80°

X

If the weight of the ball is 5 N, find the tension in the string.

A 2.54 N

B 5.08 N

C 14.4 N

D 28.8 N

5 The following figure shows a man walking out of a castle along a bridge. The bridge is held by

a chain and is not touching the ground on the other side of the river.

N

T

How will the tension T in the chain and the normal force N between the bridge and the joint

change as the man walks along the bridge?

tension normal force

A increase increase

B decrease increase

C increase decrease

D decrease decrease




6 A block of mass 2 kg is resting on a slope inclined at 30° to the horizontal as shown in the

figure. After given a slight push, it slides down the slope from rest.

2 kg

30°

If the friction between the slope and the block is 8 N, find the amount of time it takes for the

block to travel a distance of 5 m down the slope. (g = 9.81 m s–2)

A 2.35 s

B 3.32 s

C 5.52 s

D 11.0 s

7 Three blocks A, B and C are pushed by a force of 3 N on a smooth surface as shown in the

following figure. The masses of A, B and C are respectively 1 kg, 2 kg and 3 kg.

A B C 3 N

Find the normal force between A and B.

A 0.5 N

B 1 N

C 2 N

D 2.5 N

8 Tom is throwing a ball vertically upwards from the ground to Amy, who is on the second floor

of a building and is 6 m above Tom. If Amy wants the ball to just reach her, with what initial

speed should Tom throw the ball? Neglect air resistance. (g = 9.81 m s-2)

A 7.67 m s–1

B 10.8 m s–1

C 58.9 m s–1

D 118 m s–1




9 A ball of mass 0.5 kg is rolling down a smooth track from rest as shown in the following figure.

If another ball of smaller mass is used, what would be the speed of the ball when it is at position

A? (g = 9.81 m s–2)

A Lower than 14.0 m s–1

B Equal to 14.0 m s–1

C Higher than 14.0 m s–1

D Cannot be determined

10 A stationary pin of 1.5 kg is hit head-on by a bowling ball of 4 kg. The speed of the bowling

ball just before collision is 5 m s–1.

Assuming that the collision is elastic, estimate the final speed of the bowling ball.

A 0

B 2.27 m s–1

C 4.55 m s–1

D 7.27 m s–1

*11 Three balls A, B and C start motion from the same height above the ground as shown in the

following figure. A and B have an initial horizontal velocity while C starts motion from rest.

They respectively take times tA, tB and tC to reach the ground.

A B C




Which of the following is correct?

A tA = tB = tC

B tA > tB = tC

C tA = tB > tC

D tA > tB > tC

*12 On the surface of a planet with mass M and radius R, the gravitational acceleration is g. The

gravitational acceleration on the surface of a planet with mass 2M and radius 2R is

A 2g

B g2

C g

D 2

g

*13 Timothy is riding on the ‘Space Wheel’ in an amusement park. He is in a kart travelling in

uniform circular motion at angular speed 1.2 rad s–1. While at the top of the wheel, his body is

upside-down. The mass of Timothy is 70 kg and the radius of the wheel is 8 m.

Which of the following statements are correct? (g = 9.81 m s–2)

(1) The maximum normal reaction force acted on Timothy by the kart is 806 N.

(2) If the radius of the wheel were smaller, Timothy might fall out of his seat.

(3) If the angular speed of the wheel were smaller, Timothy might fall out of his seat.

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)




14 Two wave pulses are travelling towards each other on a string as shown below.

Which of the following represents the shape of the string when the two pulses meet?

A

B

C

D

15 The following shows the displacement–time graph of a particle in a transverse wave at the

position d = 4 m. The wave is propagating to the right.

s

t / s 0 2 4 6 8

Which of the following is a possible displacement–distance graph of the wave at time t = 5 s?

A s

d / m 0 2 4 6 8

B s

d / m 0 2 4 6 8

C s

d / m 0 2 4 6 8

D s

d / m 0 2 4 6 8




16 The following shows a stationary wave in a string with ends fixed on both sides. Particle A is

vibrating with a period of 0.1 s.

A

2 m

Find the speed of the wave in the string.

A 0.2 m s–1

B 0.4 m s–1

C 20 m s–1

D 40 m s–1

17 The following figure shows an object A in front of a mirror M.

M

2 m s–1 3 m s–1

A A'

If A is moving to the left at 2 m s–1 and M is moving to the left at 3 m s–1, find the speed of the

image A'.

A 1 m s–1

B 2 m s–1

C 4 m s–1

D 5 m s–1




18 A vibrator is producing a water wave in a ripple tank as shown. In the figure, area A is deeper

than area B.

A B

Which of the following best shows the shape of the wavefronts when the wave enters area B?

A

B

C

D

19 A student directs green light towards a diffraction grating and observes a fringe pattern. Which

of the following changes would increase the fringe separation?

(1) Increasing the intensity of the light

(2) Replacing the green light with red light

(3) Using a diffraction grating with more lines per mm

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)

20 Which of the following statements about sound waves is INCORRECT?

A All sound waves are longitudinal waves.

B Sound waves cannot travel in a vacuum.

C Ultrasound cannot be heard by humans.

D Sound waves cannot appear as stationary waves.




21 As shown in the following figure, three conducting spheres A, B and C are in contact and sphere

C is earthed. A positively charged rod is brought near sphere A and then the three spheres are

separated.

+

+ +

+ +

+ A B C

Which of the following correctly describes the charge of the spheres after separation?

sphere A sphere B sphere C

A negative positive positive

B negative neutral positive

C negative neutral neutral

D neutral neutral neutral

*22 Four charged spheres are fixed at the four corners of a square ABCD of side R. The spheres at A,

B, C and D respectively carry charges Q, Q, –Q and –Q, where Q is positive. A fifth sphere of

charge Q is put at the centre of the square.

A C

B D

R Q

Q

–Q

–Q

Q

What is the magnitude of the force experienced by this sphere due to the other spheres?

A 2

222

4

1

R

Q

B 2

224

4

1

R

Q

C 2

228

4

1

R

Q

D 2

2216

4

1

R

Q




23 Four identical conducting blocks are connected in various ways. Which of the following will

result in the smallest equivalent resistance across the two ends?

A

B

C

D

24 In the following circuit, light bulbs A, B and C respectively have resistance 3 Ω, 1 Ω and 2 Ω.

3 Ω

1 Ω 2 Ω A

B C

Which light bulb glows with the highest power?

A Light bulb A

B Light bulb B

C Light bulb C

D Cannot be determined

25 A student mistakenly connects a circuit as follows.

V

A

Which of the following will happen?

(1) The light bulb will be very dim.

(2) The ammeter will show a very large reading.

(3) The voltmeter will show a near-zero reading.




A (1) only

B (1) and (2) only

C (1) and (3) only

D (2) and (3) only

26 Two parallel wires are carrying currents with the same magnitude but in opposite directions.

Which of the following correctly represents the magnetic field near the wires?

A

B

C

D

27 The following figure shows an electron flying towards a wire carrying a current I.

– I

Which of the following best shows the path of the electron?

A

–

B

–

C

–

D

–




28 The figure shows a simple d.c. motor.

Which of the following can increase the turning effect on the coil?

(1) Increasing the current in the coil

(2) Increasing the number of turns in the coil

(3) Increasing the area of the coil

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D (1), (2) and (3)

*29 The following figure shows an ideal transformer, in which the primary and secondary coils have

respectively 100 and 1000 turns. The r.m.s. voltage of the a.c. source is 220 V and the resistance

of the load is 100 Ω.

a.c. source

transformer

load

Find the peak current in the secondary circuit.

A 211 A

B 22 A

C 222 A

D 44 A




30 A bar magnet is dropped through a small metal ring. An e.m.f. is induced in the ring. Take the

direction of the arrow shown in the following figure as positive.

N

S

bar magnet

metal ring

+

Which of the following graphs best shows how the e.m.f. induced in the ring varies with time?

A ε

t

B ε

t

C ε

t

D ε

t

31 Which of the following matches of types of reaction to the nuclear reactors is INCORRECT?

nuclear reactor type of reaction

A nuclear plant controlled nuclear fission

B the sun controlled nuclear fusion

C atomic bomb uncontrolled nuclear fission

D hydrogen bomb uncontrolled nuclear fusion




32 A nuclide X as shown below undergoes a series of α-α-α-β decays.

230

225

220

X

230

225

220

85 90

P

Q

R

S

proton number

mass n

um

ber

Which of P, Q, R and S is the final product of the decays?

A P

B Q

C R

D S

*33 Radium-226 is a radioactive isotope of radium with half-life 5.75 years. A sample of

radium-226 initially has activity 200 Bq. What is the expected activity of the sample after 10

years?

A 35.1 Bq

B 59.9 Bq

C 113 Bq

D 134 Bq

END OF SECTION A




List of data, formulae and relationships

Data

molar gas constant R = 8.31 J mol−1 K−1

Avogadro constant NA = 6.02 1023 mol−1

acceleration due to gravity g = 9.81 m s−2 (close to the Earth)

universal gravitational constant G = 6.67 10−11 N m2 kg−2

speed of light in vacuum c = 3.00 108 m s−1

charge of electron e = 1.60 10−19 C

electron rest mass me = 9.11 10−31 kg

permittivity of free space 0 = 8.85 10−12 C2 N−1 m−2

permeability of free space 0 = 4 10−7 H m−1

atomic mass unit u = 1.661 10−27 kg (1 u is equivalent to 931 MeV)

astronomical unit AU = 1.50 1011 m

light year ly = 9.46 1015 m

parsec pc = 3.09 1016 m = 3.26 ly = 206 265 AU

Stefan constant = 5.67 10−8 W m−2 K−4

Planck constant h = 6.63 10−34 J s

Rectilinear motion Mathematics

For uniformly accelerated motion:

v = u + at

s = ut +2

2

1at

v2 = u2 + 2as

Equation of a straight line y = mx + c

Arc length = r

Surface area of cylinder = 2rh + 2r2

Volume of cylinder = r2h

Surface area of sphere = 4r2

Volume of sphere =3π

3

4r

For small angles, sin tan (in radians)

Astronomy and Space Science

U =r

GMm− gravitational potential energy

P = AT4 Stefan’s law

0f

f

c

v

0λ

λ Doppler effect

Energy and Use of Energy

AE

= illuminance

t

Q=

d

TTA )( CH − rate of energy transfer by conduction

U =d

thermal transmittance U-value

P =3

2

1Av maximum power by wind turbine

Atomic World

2

maxe2

1vm = hf − Einstein’s photoelectric equation

En =

−2

0

2

4

e

28

1

h

em

n=

2

6.13

n− eV

energy level equation for hydrogen

atom

=p

h=

mv

h de Broglie formula

d

λ22.1 Rayleigh criterion (resolving power)

Medical Physics

d

λ22.1 Rayleigh criterion (resolving power)

power =f

1 power of a lens

L =0

log10I

I intensity level (dB)

Z = c acoustic impedance

=0

r

I

I=

2

12

2

12

)(

)(

ZZ

ZZ

+

− intensity reflection coefficient

xeII −= 0 transmitted intensity through a

medium




A1. E = mcT energy transfer during

heating and cooling D1. F =

20

21

π4 r

QQ

Coulomb’s law

A2. E = lm energy transfer during

change of state D2. E =

20π4 r

Q

electric field strength due to a

point charge

A3. pV = nRT equation of state for an

ideal gas D3. E =

d

V

electric field between parallel

plates (numerically)

A4. pV = 2

3

1cNm kinetic theory equation D4. R =

A

l resistance and resistivity

A5. EK =A2

3

N

RT molecular kinetic energy D5. R = R1 + R2 resistors in series

D6. R

1=

1

1

R+

2

1

R resistors in parallel

B1. F =t

vm

=

t

p

force D7. P = IV = I2R power in a circuit

B2. moment = F d moment of a force D8. F = BQv sin force on a moving charge in a

magnetic field

B3. EP = mgh gravitational potential

energy D9. F = BIl sin

force on a current-carrying

conductor in a magnetic field

B4. EK =2

2

1mv kinetic energy D10. B =

r

I

π2

0 magnetic field due to a long

straight wire

B5. P = Fv mechanical power D11. B =l

NI0 magnetic field inside a long

solenoid

B6. a =r

v2

= 2r centripetal acceleration D12. =t

N

induced e.m.f.

B7. F =2

21

r

mGm

Newton’s law of

gravitation D13.

p

s

V

V

p

s

N

N

ratio of secondary voltage to

primary voltage in a

transformer

C1. y =a

λD

fringe width in

double-slit interference E1. N = N0e−kt law of radioactive decay

C2. d sin = n diffraction grating

equation E2.

2

1t =k

2ln half-life and decay constant

C3. vu

11+ =

f

1 equation for a single

lens E3. A = kN

activity and the number of

undecayed nuclei

E4. E = mc2 mass-energy relationship

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