OXFORD UNIVERSITY PRESS

NEW SENIOR SECONDARY PHYSICS AT WORK

(SECOND EDITION)

MOCK EXAMINATION (Set 1)

COMBINED SCIENCE —— PHYSICS

Time allowed: 1 hour 40 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 40
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 page 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.

New Senior Secondary Physics at Work (Second Edition)

Combined Science — Physics Mock Exam (Set 1) 1
 Oxford University Press 2015
Section A

There are 22 questions.

1 John measures the energy needed to raise the temperature of various amounts of water in a
beaker by 10 C. The figure below shows his results. According to John’s result, what is the
specific heat capacity of water?

A 4000 J kg–1 C–1

B 4200 J kg–1 C–1
C 4400 J kg–1 C–1
D 5400 J kg–1 C–1

2 Susan wraps a can of soft drink of mass 300 g with a piece of wet cloth. Both the soft drink and
the wet cloth are at room temperature. Then she places the soft drink in front of an operating
fan. After a while, the temperature of the soft drink decreases by 5 C. Assume that the water
takes energy only from the soft drink to evaporate. Find the mass of water evaporated.
Given: specific heat capacity of the soft drink = 3700 J kg–1 C–1
specific heat capacity of the water = 4200 J kg–1 C–1
specific latent heat of vaporization of water = 2.26  106 J kg–1
A 2.13 g
B 2.16 g
C 2.38 g
D 2.46 g

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3 A small amount of crushed ice at 0 C is put into a large cup of cold water at 0 C. Which of
the following statements is correct? Assume there is no heat transfer between the water and the
surroundings.
A The temperature of the water will not change.
B The ice will melt.
C The total mass of ice in the cup will drop because the crushed ice has a much smaller
internal energy than the water in the cup.
D The total mass of ice in the cup will increase.

4 Richard stands on a weighing scale calibrated in kilograms in a lift. When the lift accelerates
upwards at 1.5 m s2, the scale reads 68 kg. What is Richard’s mass? (g = 9.81 m s–2)
A 59 kg
B 62 kg
C 68 kg
D 80 kg

5 A car travels along a straight road. The figure below shows its accelerationtime graph, taking
its moving direction as positive.

acceleration / m s2

0 time / s
10 16
1

If the car’s velocity is 54 km h1 at t = 0, which of the following statements is/are correct?
(1) The car’s velocity is 68 km h1 at t = 16 s.
(2) The car’s average acceleration in these 16 seconds is 0.875 m s2.
(3) The car changes its moving direction at t = 10 s.
A (1) only
B (2) only
C (1) and (3) only
D (1), (2) and (3)

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6 A boy slides down a slide at a constant speed as shown. The slide is supported at two points X
and Y.

How do the magnitudes of the reaction forces acting on the slide at X and Y change as the boy
slides down?
X Y
A increases decreases
B increases increases
C decreases decreases
D decreases increases

7 A girl stands on a stationary skateboard. Then she starts to walk forwards on the skateboard as
shown. Neglect the friction between the skateboard and the ground.

Which of the following statements is correct?

A The girl remains at the same position and the skateboard moves backwards.
B The girl moves forwards and the skateboard moves backwards.
C The girl moves forwards and the skateboard remains at the same position.
D Both the girl and the skateboard move forwards.

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8 Edward and Fred are driving their own cars. Edward’s car has a larger mass than Fred’s. The
two cars collide head on with each other. Edward and Fred have the same mass and both wear a
seat belt. Which of the following statements must be correct?
(1) The impact forces acting on Edward and Fred have the same magnitude.
(2) The impact forces acting on the two cars have the same magnitude.
(3) The changes in velocities of the two cars have the same magnitude.
A (2) only
B (3) only
C (1) and (2) only
D (1), (2) and (3)

9 An object is projected horizontally with a speed v from a cliff as shown.

cliff
level X

level Y

Which of the following statements is/are correct?

(1) If the initial speed of the object is increased to 2v, the time needed for it to travel from
level X to level Y will be halved.
(2) If the initial speed of the object is increased to 2v, the horizontal distance it travels when
it falls from level X to level Y will be doubled.
(3) If the mass of the object is doubled, the time needed for it to travel from level X to level
Y will be halved.
A (2) only
B (1) and (2) only
C (1) and (3) only
D (1), (2) and (3)

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10 A ping-pong ball is thrown vertically upwards with an initial speed u. It then falls back to the
initial position. Air resistance is NOT negligible. Which of the following statements is/are
correct?
(1) The ball’s speed is lower than u when the ball returns to its initial position.
(2) The total energy of the ball and the air is conserved.
(3) The net force acting on the ball is zero when the ball reaches its highest position.
A (1) only B (3) only
C (1) and (2) only D (1), (2) and (3)

11 Two coherent sources X and Y produce circular water waves in a ripple tank. P is a point where
constructive interference occurs. Which of the following statements about point P is/are
correct?
(1) A trough from X and a trough from Y arrive at P at the same instant.
(2) The particle at P is at its equilibrium position at some instants.
(3) The particle at P always stays at the maximum displacement.
A (3) only
B (1) and (2) only
C (1) and (3) only
D (2) and (3) only

12 The figure shows a stationary wave formed on a string fixed at both ends. At the moment
shown, point X on the stationary wave is moving upwards.

1.5 m

Which of the following statements is/are correct?

(1) Point Y is momentarily at rest at the moment shown.
(2) The wavelength of the wave is 1 m.
(3) The average speeds of points X and Y in one period’s time are the same.
A (1) only
B (2) only
C (1) and (2) only
D (2) and (3) only

New Senior Secondary Physics at Work (Second Edition)

Combined Science — Physics Mock Exam (Set 1) 6
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13 A beam of monochromatic light travels from air into water. How do the speed and the
wavelength of the light change?
Speed Wavelength
A remains unchanged remains unchanged
B decreases remains unchanged
C decreases decreases
D decreases increases

14 Three musical notes X, Y and Z are displayed on a CRO screen as shown. The CRO settings for
them are the same.

Note X:

Note Y:

Note Z:

Which of the following statements about the notes is/are correct?

(1) Note X is louder than note Z.
(2) Note X has a lower pitch than note Y.
(3) Notes X and Z have different qualities.
A (2) only
B (3) only
C (1) and (3) only
D (2) and (3) only

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15

A ray of monochromatic light enters a solid transparent medium X from air. The incident ray
makes an angle of 55 with the boundary plane as shown. Which of the following statements
is/are correct?
(1) The higher the speed of light in medium X, the smaller the angle of refraction.
(2) The angle of refraction must be smaller than 35.
(3) Dispersion of light will occur in medium X.
A (1) only
B (2) only
C (1) and (2) only
D (1) and (3) only

(For questions 16 and 17) A longitudinal wave travels past a series of particles on a spring from left
to right with a speed of 40 cm s1. The figure below shows the equilibrium positions of the particles
and their positions at time instant t.

equilibrium
positions

time t

16 Which of the following particles is momentarily at rest at time instant t?

A Particle E
B Particle F
C Particle G
D Particle H

17 What is the period of the longitudinal wave?

A 0.5 s
B 1.0 s
C 2.0 s
D Cannot be determined

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18

Two small conducting spheres X and Y carrying charges +2 µC and –3 µC respectively are
situated at fixed positions as shown. A positive test charge q is located at a certain position on
the line joining the centres of the spheres. The resultant electrostatic force due to the spheres
acting on q points towards the left. After the spheres have touched each other momentarily and
returned to their original positions, the resultant electrostatic force on q points towards the
right. What is/are the possible location(s) of the test charge q?
(1) To the left of X
(2) To the right of Y
(3) Between the spheres
A (1) only
B (2) only
C (3) only
D (1) and (2) only

19 Two identical light bulbs P and Q, each of resistance 6 Ω, are connected to a 12-V power
supply as shown. The range of the variable resistor is 0–18 . The power source has negligible
internal resistance. Which of the following statements is/are correct?

(1) When the variable resistor has zero resistance, bulbs P and Q have the same brightness.
(2) When the variable resistor is at its maximum resistance, bulb Q has the maximum
brightness.
(3) Bulb P is always brighter than bulb Q.
A (1) only
B (3) only
C (1) and (3) only
D (2) and (3) only

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20

In the above figure, P and Q are two metal spheres suspended from two insulating strings of
equal length. Which of the following statements is/are correct?
(1) P and Q carry opposite charges.
(2) Q must carry a larger net charge than P.
(3) P and Q are of different mass.
A (2) only
B (3) only
C (1) and (3) only
D (2) and (3) only

21 A metal rod XY is placed on two smooth parallel conducting rails whose ends P and Q are
connected by a conducting wire. The rails are tilted slightly so that the rod slides to the right
into a uniform magnetic field pointing out of the paper as shown. Which of the following
statements is/are correct when the rod is moving in the magnetic field?

(1) A current passes from P to Q through the wire.

(2) There will be no potential difference across X and Y if the conducting wire is broken.
(3) The rod will slide to the right at a higher rate if the wire connecting P and Q is removed.
A (1) only
B (3) only
C (2) and (3) only
D (1), (2) and (3)

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Combined Science — Physics Mock Exam (Set 1) 10
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New Senior Secondary Physics at Work (Second Edition)
Combined Science — Physics Mock Exam (Set 1) 11 Go on to the next page
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22 An electrical appliance rated at ‘12 V, 25 W’ is connected to the 220-V mains through a
step-down transformer. The output voltage of the transformer is 12 V. The efficiency of the
transformer is 90%. Find the current drawn from the mains.
A 114 mA
B 120 mA
C 126 mA
D 140 mA

END OF SECTION A

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 List of data, formulae and relationships
Data
acceleration due to gravity g = 9.81 m s2 (close to the Earth)
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

Rectilinear motion
For uniformly accelerated motion:

v = u + at
s = ut +
v2 = u2 + 2as

Mathematics
Equation of a straight line y = mx + c
Arc length = r
Surface area of cylinder = 2rh + 2r2
Volume of cylinder = r2h
Surface area of sphere = 4r2

Volume of sphere =

For small angles, sin   tan    (in radians)

energy transfer during

E = mcT R= resistance and resistivity
heating and cooling

energy transfer during

E = lm R = R1 + R2 resistors in series
change of state

= + resistors in parallel

F= = force P = IV = I2R power in a circuit

ratio of secondary voltage to

moment = F  d moment of a force 
primary voltage in a transformer

gravitational potential
EP = mgh
energy

EK = kinetic energy

P = Fv mechanical power

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Combined Science — Physics Mock Exam (Set 1) 13
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