Cambridge IGCSE™
PHYSICS
0625/23
Paper 2 Multiple Choice (Extended)
May/June 2020
45 minutes
You must answer on the multiple choice answer sheet.
*4570649359*
You will need: Multiple choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
INSTRUCTIONS
• There are forty questions on this paper. Answer all questions.
• For each question there are four possible answers A, B, C and D. Choose the one you consider correct
and record your choice in soft pencil on the multiple choice answer sheet.
• Follow the instructions on the multiple choice answer sheet.
• Write in soft pencil.
• Write your name, centre number and candidate number on the multiple choice answer sheet in the
spaces provided unless this has been done for you.
• Do not use correction fluid.
• Do not write on any bar codes.
• You may use a calculator.
• Take the weight of 1.0 kg to be 10 N (acceleration of free fall = 10 m / s2).
INFORMATION
• The total mark for this paper is 40.
• Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
• Any rough working should be done on this question paper.
This document has 20 pages. Blank pages are indicated.
IB20 06_0625_23/3RP
© UCLES 2020
[Turn over
2
1
Diagram 1 shows a solid, rectangular-sided block.
top
front
side
diagram 1
Diagram 2 shows the same block from the front and from the side.
-
6
7
-
cm 1
4
5
af
side
cm 1
2
3
front
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22
7-
diagram 2
I
Metre rules have been shown close to the edges of the block.
What is the volume of the block?
A
120 cm3
-
© UCLES 2020
-0
B
168 cm3
-
C
264 cm3
-
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D
1155 cm3
-
3
2
A student investigates the motion of a ball rolling down a slope.
The diagram shows the speed v of the ball at different times t.
t = 0s
v = 0 cm / s
-
t = 0.2 s
v = 2.8 cm / s
-
ball
-4¥
ii. 5
a-
=
t = 0.4 s
v = 5.1 cm / s
t = 0.6 s
v = 7.0 cm / s
1¥ Ms ↳
a-
-
÷¥:
Which statement describes the motion of the ball?
3
4
A
The acceleration is not constant.
B
The acceleration is negative.
C
The speed is decreasing.
D
The velocity is constant.
Which statement about acceleration is correct?
:
A
It is related to the changing speed of an object.
B
It is the distance an object travels in one second.
C
It is the force acting on an object divided by the distance it travels in one second.
D
It is the force acting on an object when it is near to the Earth.
Which statement correctly describes the effects of placing a heavy load in a car?
A
It is easier to accelerate the car and easier to bring the car to rest.
B
It is easier to accelerate the car but more difficult to bring the car to rest.
C
It is more difficult to accelerate the car and more difficult to bring the car to rest.
D
It is more difficult to accelerate the car but easier to bring the car to rest.
© UCLES 2020
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[Turn over
4
5
Which row gives the correct weight for the mass shown?
The value of g is 10 N / kg.
6
N=
mass / kg
weight / N
A
0
2
20
B
10
1
C
10
10
D
20
2
m=
m
.
f. V
g→
=
A rectangular gymnasium is 50 m long, 25 m wide and 8.0 m high.
✓
✓
The density of air is 1.2 kg / m3.
=
What is the best estimate of themass of air in the gymnasium?
A
7
0.00012 kg
100 kg
7-
→ resultant
↳
A
a diver rising vertically through water at constant speed
B
an aircraft circling an airport at constant speed
C
a parachutist descending vertically at terminal velocity
D
force -1-0
⑤→
-
=
M A
-
.
.
-
a train going up a straight slope at constant speed
Which quantity is not a vector?
A
.
C 8300 kg
D 12 000 kg
→
Which moving object has a resultant force acting on it?
E
8
B
=
?
50×25×8
12 ✗
•
I
9=10 Mls
acceleration
veto
max
velo that an object
obtain
¥¥¥e•
-
B
temperature
C
velocity
D
weight
can
- -
doomIS
dir ogrelo
is
changing
© UCLES 2020
-
while freefalling
µ
8
Ñ=^¥=☒iIh?
.
centripetal force
0625/23/M/J/20
/
acte
.
.
dir
for the coordinate system
step choose
m.ci
a
s¥ Align the rectors to the dir 5 Ap=
d
a
.
-
D=
I
.
of the coordinate
chemgemoinmentum mass final
A ball falls vertically to the floor and rebounds vertically upwards.
.
9
initial
veto
.
Just before it hits the floor, its speed is 4.0 m / s.
A
As it rebounds, its speed is 3.0 m / s.
The mass of the ball is 0.50 kg.
#
A
0.50 kg m / s downwards
B
0.50 kg m / s upwards
C
Ap
3.5 kg m / s downwards
=
D 3.5 kg m / s upwards
0
IP
4m¥ / JV
0
(
m
=
2
average
force
v
-
)µ
u
-4 because
0-5 [3- (4) ]
=
→
.
↳
time of
contact
floor
uisñoppo
dir with
Oy
it's a positive
Apis in the
.
value
same
10 A mass bounces up and down on a steel spring. The diagram shows the mass and the spring at
different points during the motion.
highest
point
EPE
=
IAN
mass
moving
down
the extension
J
.
=3 Mls
0
-
What is the change in momentum of the ball?
f. At
dir
with Oy
mass
moving
up
of spring
lowest
point
At which point does the mass have the least gravitational potential energy and at which point is
the most elastic energy stored in the spring?
least amount of
gravitational
potential energy
most elastic energy
stored in spring
A
mass moving down
B
=
mass moving up
mass moving down
lowest point
C
lowest point
mass moving up
D
o
lowest point
lowest point
© UCLES 2020
↳ a-pE=mgh
-
0625/23/M/J/20
[Turn over
.
.
6
11 The velocity v of an object increases as it falls towards the ground.
Which quantity is directly proportional to v2?
I
A
the speed of the object
B
the gravitational potential energy of the object
C
the kinetic energy of the object
D
the momentum of the object
KE
✓
I ww ?
=
12 The diagram shows a solid block resting on a bench. The dimensions of the block are shown.
40 cm
20 cm
80 cm
Q
%
P
bench
R
On which labelled surface should the block rest to produce the smallest pressure on the bench?
pt=¥pÉt
A P
0
B
Q
C
R
D
P, Q and R produce the same pressure
is
unchanged
13 A pipe full of water connects a water supply on a hill to a tap lower down the hill.
The length of the pipe is 500 m. The height of the supply above the tap is 100 m.
The density of the water is 1000 kg / m3. The effect of atmospheric pressure is negligible.
What is the water pressure at the tap?
A
100 000 Pa
B
500 000 Pa
C 1 000 000 Pa
°
D
5 000 000 Pa
HE
:#
*
.
P =p
.
g.
= tooo
=
© UCLES 2020
0625/23/M/J/20
1.06
h
.
100
✗ 10 ✗
.
.
7
14 When a molecule rebounds from a wall, a force is exerted on the wall.
What causes this force?
I
I
A
the kinetic energy gained by the molecule
B
the kinetic energy lost by the molecule
C
the change of momentum of the molecule
D
the change of speed of the molecule
A-
p=m
-
AV =
F. at
•
✓
-
15 The relationship between pressure p and volume V of a gas is given as pV = constant.
Under which conditions for the mass of a gas and for its temperature does the equation hold?
mass
temperature
A
changing
changing
B
changing
constant
C
constant
changing
D
°
constant
constant
pv
④ R.TO
t
d
=
not
↳ mass
temp
16 The diagram shows a liquid-in-glass thermometer.
X
Y
Which row gives the correct labels for the thermometer?
X
EI
Y
A
water
narrow tube of uniform diameter
B
alcohol
narrow tube of uniform diameter
C
water
this end immersed in substance to be measured
D
alcohol
this end immersed in substance to be measured
© UCLES 2020
-
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.
8
17 The diagrams show four blocks of steel. The blocks are all drawn to the same scale.
The same quantity of thermal energy is given to each block.
Which block shows the greatest rise in temperature?
QO
A
B
Q
C
D
Q
Q
18 Why are metals better conductors of thermal energy than non-metals?
A They contain free electrons.
0
has free
metal
B Their molecules are further apart.
thermae
C Their molecules vibrate at a higher frequency.
electrons
D
They have smoother surfaces.
✓
electric
.
.
19 The diagram shows a vacuum flask used to keep a liquid warm.
airtight lid
outer cover
vacuum
silvered walls
heat transfer
2
/
↳
radiation
all
conduction µ
solid
convection
eia;E!ga÷
Which methods of heat loss are reduced by the vacuum between the silvered walls?
__-
A
↳
conduction only
B conduction and convection only
0
heat can only
C
convection and radiation only
D
conduction, convection and radiation
© UCLES 2020
transfer via radiations
0625/23/M/J/20
.
,
I
9
20 An earthquake-monitoring station records the arrival of 16 complete waves of an earthquake
wave in 20 s.
-
>
+ = 20
0
The speed of the earthquake wave is 6.0 km / s.
What is the wavelength of the earthquake wave?
1.3 × 10–4 m
A
IT
=
=
B
2.1 × 10 m
dot
C
4.8 × 103 m
T
I
–4
D 7.5 × 10 I
m
0
3
D= V.T
=
21 The diagram shows a wave.
?
20s
=%-
6000mg
✗
=
1.25s
1.25k
=
7500m
D= 8 cm
•
•
A- 3 cm
6 cm
4 cm
What are the amplitude and the wavelength of this wave?
amplitude / cm
wavelength / cm
A
3
4
B
O
3
8
C
6
4
D
6
8
N
22 Which statement is correct?
=
Vyñsvacuiem
in
.
medium
A The speed of light in glass is equal to the speed of light in a vacuum multiplied by the
✓
refractive index of glass.
V
✓
✗
n
OO
€
glass
=
vacuum
B
The incident angle of a light ray at an air-glass surface is the angle between the ray and the
glass surface.
C
The sine of the critical angle at an air-glass surface is equal to
[ ie=D
-
1
.
refractive index of glass
The angle of refraction for light passing through an air-glass surface is proportional to the
angle of incidence at that surface.
④:=ns④r
© UCLES 2020
> sin
.
0625/23/M/J/20
*
:*
.
[Turn over
10
23 Which statement about converging lenses is correct?
tableoegimageformiy:
A A real image of an object projected onto a screen by a converging lens is always inverted.
g
B
The image formed by a converging lens is always upright.
C
The image formed by a converging lens when used as a magnifying glass is a real image.
D
Parallel rays entering a converging lens are focused at a distance greater than the focal
length from the lens.
24 An intruder alarm sensor detects that a person is warmer than his surroundings.
Is infrared
Which type of electromagnetic wave does the sensor detect?
A infrared
0
B
radio
C
ultraviolet
D
visible light
25 Two people are standing outdoors on either side of a high wall.
"
☒
person 1
person 2
Person 1 can hear person 2 talking although he cannot see her.
Which statement explains this?
A The sound waves have diffracted around the wall.
0
-
B
The sound waves have passed unaffected through the wall.
C
The sound waves have reflected around the wall.
D
The sound waves have refracted around the wall.
© UCLES 2020
0625/23/M/J/20
.
11
26 Four nails A, B, C and D are tested to find which makes the strongestpermanent magnet.
One of the nails is placed against a bar magnet and the number of paper clips which the nail can
support is recorded.
-1
I
nail
N
S
bar magnet
paper clips
The bar magnet is then removed and the number of paper clips remaining attached to the nail is
recorded. Each nail is tested individually.
Which nail becomes the strongest permanent magnet?
number of paper clips attached to the nail
bar magnet present
bar magnet removed
A
I2
100%
0 1
B
I2
1 I
C
0
I4
N%
2590
I5
60%
2 I
D
© UCLES 2020
3 1
0625/23/M/J/20
[Turn over
12
⑧
27 The diagrams show a magnetised steel rod inside a solenoid connected to a potentiometer.
-
=
-
In diagram 1, the potentiometer is connected to a d.c. power supply.
In diagram 2, the potentiometer is connected to an a.c. power supply.
step
.
magnetised
steel
carrot
Identify theroute
magnetised
steel
s→ R
.
steps Comparing
between
positions
P
resistance
.
Q
I - Ipi
different
(• •?zy
R
d.c.
the
steps Connect charge of
diagram 1
resistant the change
osothen quantities
Which action would demagnetise the piece of steel?
a.c.
.
/
.
S
diagram 2
.
We
÷
A
In diagram 1, move the potentiometer slide from P to Q.
B
In diagram 1, move the potentiometer slide from Q to P.
C
In diagram 2, move the potentiometer slide from R to S.
D
In diagram 2, move the potentiometer slide from S to R.
want the current
to decrease
.
28 The diagram shows a positively charged conducting sphere and a wire connected to earth.
positively charged sphere
wire
"
+
+
+
+
+
+
positive charges
( protons)
are
earth
insulating support
What happens when the wire is touched onto the sphere?
A Electrons flow from earth to the sphere.
0
B
Electrons flow from the sphere to earth.
C
Positive charges flow from earth to the sphere.
D
Positive charges flow from the sphere to earth.
?⃝
?⃝
© UCLES 2020
0625/23/M/J/20
never move
.
?⃝
13
29 A student uses the circuit shown to determine the resistance of two identical resistors.
V , -1=1.1 V.
F- 2. ZV
since
-4--1--2=0-025^-12
A
¥§÷=T→=I
Ra
,
p-¥=¥_=
20
'
V
The voltmeter reading is 2.2 V and the ammeter reading is 0.25 A.
V=YtV2
since Riri
What is the resistance of each resistor?
-
A
0.275 Ω
B
0.55 Ω
4.4 Ω
C
D
8.8 Ω
30 There is a current of 2.0 A in a resistor of resistance 8.0 Ω.
-
A
0.25 W
B
4.0 W
C
V=I③^=IR=
16 W
⑧
D
32 W
"
¥0
8×22
=
31 The lamps, the diodes and the batteries in the circuits are identical.
E-
.
p=I.V=RI2
-
How much power is dissipated in the resistor?
V1 __vs=I
32W
In which circuit does the ammeter give the greatest reading?
-
A
B
C
¥÷ II.
A
A
D
A
A
Rain;Ra
¥:
parallel total resistance issmallercomponeutresistons
:
32 Two resistors are connected in series with a power supply.
-
-
Which statement about the circuit is correct?
¥
A
ithas the
highest current
.
_-☐-☐→I
.
The current from the supply is greater than the current in each resistor.
-
B
The current from the supply is equal to the current in each resistor.
C
The current from the supply is less than the current in each resistor.
D
The current from the supply is the sum of the currents in each resistor.
© UCLES 2020
-
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.
I -12
[Turn over
skip
14
'
33 Which two logic gates each have a high output when both of their inputs are high?
skip
-
A
AND and OR
B
AND and NOR
C
NAND and NOR
D
NAND and OR
.
34 The diagram shows a series of logic gates and part of its corresponding truth table.
P
Q
R
T
S
P
Q
R
S
T
0
0
0
0
1
0
1
1
0
0
1
1
1
1
1
1
0
What are the missing values in row 2 of the truth table?
A
010
© UCLES 2020
B
011
C
100
0625/23/M/J/20
D
111
15
35 The graphs show how the currents in three circuits vary with time.
circuit 1
1.5
current / A 1.0
0.5
0.0
–0.5
–1.0
–1.5
✓
circuit 2
1.5
current / A 1.0
0.5
0.0
–0.5
–1.0
–1.5
time
④
circuit 3
1.5
current / A 1.0
0.5
0.0
–0.5
–1.0
–1.5
}
%ED.IE?;ney
only facing
left
time
In which circuits is there a direct current?
o
A
-
1 and 2
© UCLES 2020
time
1
right
D.C
.
-
B
1 and 3
C
2 only
0625/23/M/J/20
D
3 only
[Turn over
.
.
16
36 The coil of a simple a.c. generator rotates steadily in a uniform magnetic field.
-
€0s
The diagram shows the position of the coil at time t = 0.
coil
N
a
F-I. E#- ot=3Tk-v- mint- T-v- O
S
Which graph shows the output voltage for one revolution of the coil?
?
A
V
0
0
0
0
V
t
0
0
t
D
V
t
0
0
37 What occurs during nuclear fusion?
g
A
Two light atomic nuclei join together and emit energy.
B
Two light atomic nuclei join together and absorb energy.
C
A heavy atomic nucleus splits and emits energy.
D
A heavy atomic nucleus splits and absorbs energy.
t
gag
t
joining together
the sun
.
fission↳ spitting
absorb energy
→
© UCLES 2020
.
B
C
-
V
→ r = Max
0625/23/M/J/20
.
.
8×1010
17
→s8✗h•→days8×¥_
Inlays
38 A radioactive material has a half-life of 20 days.
A sample of the material contains 8.0 × 1010 atoms.
How many atomic nuclei have decayed after 60 days?
A 1.0 × 10
0
-
10
B
4.0 × 1010
C
6.0 × 1010
D
7.0 × 1010
39 A thin sheet of paper is placed between a radioactive source and a radiation detector. The count
rate falls to a very low reading.
paper
0
r
xp
detector
¥
counter
source
jnochav①
From this result, which type of radiation is the source emitting?
A α-particles
0
B
β-particles
C
γ-rays
D
X-rays
✗⑦
paper
13-0
thin
metal
stopped by
thick lead
.
40 α-particles, β-particles and γ-rays are emitted by radioactive nuclei when they decay.
Which emissions can be deflected by an electric field?
-
A α-particles and β-particles only
0
B
β-particles and γ-rays only
C
γ-rays and α-particles only
D
α-particles, β-particles and γ-rays
© UCLES 2020
✗
gp
⑧
0625/23/M/J/20
electric field
/ mayfield
.
18
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© UCLES 2020
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19
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© UCLES 2020
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20
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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
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© UCLES 2020
0625/23/M/J/20