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JUNE EXAMINATION PAPER
GRADE 10
PHYSICAL SCIENCES P1
PHYSICS
JUNE 2012
MARKS: 150
TIME: 2 hours
This exam paper consists of 2 data sheets
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INSTRUCTIONS AND INFORMATION
1.
Write your name in the appropriate spaces on the ANSWER BOOK.
2.
Answer ALL the questions
3.
Non-programmable calculators may be used.
4.
Appropriate mathematical instruments may be used.
5.
Number the answers correctly according to the numbering system used in this question
paper.
6.
A data sheet is attached for your use.
7.
Wherever motivation, discussion, et cetera is required, be brief.
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SECTION A
Answer this section in the ANSWER BOOK.
QUESTION 1:
ONE-WORD ITEMS
Give ONE word/term for each of the following descriptions. Write only the word/term
next to the question number (1.1 – 1.5) in the ANSWER BOOK.
1.1
A physical quantity that has both magnitude and direction.
(1)
1.2
The change in position of an object in a known direction.
(1)
1.3
A single disturbance in a medium.
(1)
1.4
Rate of flow of charge
(1)
1.5
The nature of the force that a negative charge exerts on a positive charge.
(1)
[5]
QUESTION 2:
MATCHING ITEMS
Choose an item from COLUMN B that matches a description in COLUMN A. Write only
the letter (A-I) of your choice next to the question number (2.1-2.5) in the ANSWER BOOK.
COLUMN A
2.1
2.2
2.3
COLUMN B
Energy a moving object has
Rate of change in velocity.
An example of a transverse wave.
A
Positive
B
Radio waves
C
Iron
D
EK
E
Thunder
F
Acceleration
2.4
An electrical insulator.
G
Negative
2.5
Glass acquires this charge when rubbed with silk.
H
Plastic
I
EP
[5]
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QUESTION 3: TRUE OR FALSE
Indicate which of the following statements are TRUE or FALSE. Write only ‘true’ or
‘false’ next to the question number (3.1-3.5) in the ANSWER BOOK. If the statement is FALSE,
write down the correct statement.
3.1
The acceleration due to gravity, g, has the same value everywhere on
the earth’s surface.
3.2
(2)
A point in a standing wave where destructive interference takes place is
called a node.
(2)
3.3
Refraction is the change in wave speed in different optical media.
(2)
3.4
A voltmeter is connected in series in an electric circuit.
(2)
3.5
Lightning causes the aurora borealis.
(2)
[10]
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QUESTION 4: MULTIPLE CHOICE QUESTIONS
Four possible answers are provided as answers to the following questions. Each
question has only ONE correct answer. Choose the correct answer and write down only the
letter (A-D) next to the question number (4.1-4.5) in the ANSWER BOOK.
4.1
A bus is traveling at a constant velocity of v m.s-1 in a straight line between
two road signs A and C. What is the instantaneous velocity of the bus at a
point B somewhere between A and C? A value …
4.2
A
equal to v m.s-1
B
less than v m.s-1
C
greater than v m.s-1
(3)
A sphere falls freely from rest near the earth’s surface. Which one of the
following remains constant as it falls? Its …
4.3
A
displacement
B
velocity
C
acceleration
D
kinetic energy
(3)
In a wave motion one complete vibration is made in x seconds. The period
and frequency of this wave is:
Period (s)
Frequency (Hz)
A
x
2x
B
x
1
x
C
x
1
2x
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(3)
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D
4.4
1/x
x
Red light strikes a mirror at an angle of 30o to its surface. When it is
reflected the angle of reflection will be equal to:
4.5
A
25o
B
30o
C
60o
D
150o
(3)
Two identical resistors with resistance X ohms are connected in parallel in
an electric circuit. The total resistance they provide in the circuit has a value …
A
equal to 2X
B
equal to
C
equal to
D
less than X
2
x
(x  x)
2
(3)
[15]
TOTAL SECTION A:
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SECTION B
INSTRUCTIONS
1.
Answer this section in the ANSWER BOOK.
2.
In ALL calculations, formulae and substitutions must be shown.
3.
Round off your numerical answers correct to TWO decimal places.
4.
ANSWER ALL THE QUESTIONS IN THIS SECTION
QUESTION 5
Begin on a new page
The graph below illustrates the motion of a car that started from rest at A and
travelled east. B, C and D represent three other specific points in the car’s motion.
v (m.s-1)
B
90
C
A
0
18
27
D
39
t (s)
Use the graph to answer the following questions:
5.1
Use words to describe the motion of the car from A to D.
(5)
(No calculations are required)
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5.2
Calculate the car’s final displacement from A when it reached D.
5.3
Draw an acceleration versus time graph to show the motion
(4)
of the car from A to D.
(4)
(Numerical data on the axes is not required)
[13]
QUESTION 6
Begin on a new page
A helicopter rises vertically upwards at constant velocity from an accident scene.
When the helicopter is 24 m above the road, a camera on board falls out and strikes
the road 3 s later. Ignore air friction.
6.1
Calculate the velocity of the helicopter.
(5)
6.2
Calculate the distance between the helicopter and the camera 1 s after
the camera fell out of the helicopter.
(6)
[11]
QUESTION 7
Begin on a new page
An alien lands on a planet X as well as earth. The weight of the alien on
each of these planets is provided in the table below.
Planet
Weight (N)
X
588
Earth
392
Use the table to answer the following questions:
7.1
Calculate the mass of the alien.
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(2)
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7.2
Calculate the magnitude of the gravitational acceleration on planet X.
(2)
The alien falls off a bridge that is 20 m above the surface of a river on earth.
Ignore air friction.
7.3
Calculate with what speed the alien strikes the surface of the river.
(3)
[7]
QUESTION 8
Begin on a new page
Read the following warning seen on roads in South African.
SPEED
KILLS
Jabba was a teenager who loved speed and this took his life and that of his
best friend. It was a sunny Sunday afternoon when Jabba and his friend
went for a drive in his father’s old BMW.
Jabba was traveling at 50 m.s-1 (180 km.h-1) when he realised that a bus
blocking the road in front of him was stationary. When he slammed the
brakes he was 36 m from the truck but the BMW could only slow down
uniformly at 12, 5 m.s-2.
8.1
Calculate at what velocity (in m.s-1) the BMW struck the bus.
(5)
8.2
Convert the velocity obtained in question 8.1 to km.h-1.
(2)
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[7]
QUESTION 9
Begin on a new page
A pulse traveling along a rope is reflected at one end. The diagram below shows
the direction of the incident and reflected pulses.
Incident pulse
Reflected pulse
9.1
Is the end of the rope where the pulse is reflected fixed or free?
(2)
9.2
Give three reasons for your answer in question 9.1.
(3)
When two pulses are now sent along the rope, one incident and one reflected
pulse meet at the same point on the rope.
9.3
Will the amplitude of the pulse formed at this point be BIGGER,
SMALLER or THE SAME as the amplitude of the incident pulse?
(2)
9.4
Give an explanation for your answer in question 9.3.
(3)
9.5
Name the principle that you used to answer question 9.3.
(2)
[12]
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QUESTION 10
Begin on a new page
A transverse wave has a frequency of 1,5 Hz.
Study the section of the wave pattern made by this wave below and then
answer the questions that follow.
4m
D
A
C
20 cm
B
10.1
Write down the letter that represents a trough.
(1)
10.2
Write down the amplitude of the wave.
(2)
10.3
Explain how you obtained the answer to question 10.2.
(2)
10.4
Calculate the speed of the wave.
(4)
[9]
QUESTION 11
Begin on a new page
Total internal reflection is a very important phenomenon that is an enormous
benefit to humankind.
11.1
Write down two conditions that must be met before total internal
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reflection of light can take place between two optical media.
(2)
Read the following paragraph and then answer the questions that follow.
SNELL’S LAW
Is there a Law of refraction?
This investigative question plagued scientists for a long time. This situation brought
the invention of optical instruments that could benefit humankind to an abrupt halt.
After performing many calculations on different angles of incidence and refraction
for light passing from air through another optical medium, the Dutch mathematician
Willebrord Snell van Royen discovered that the data satisfied the following
equation:
Sin i (in air) /Sin r (in the optical medium) = n
This relationship is known as Snell’s Law in honour of Willebrord Snell van Royen.
The constant n is called the refractive index for the particular optical medium
through which light passed from air.
The refractive index enables scientists to know exactly how sharply a ray of light is
bent in an optical medium. This knowledge combined with the discovery of optical
fiber led to the invention of a range of optical instruments used in medicine and
telecommunication. These instruments have revolutionized medicine and
telecommunication on a huge scale.
11.2
A scientific investigation begins when there is a problem to be solved.
Write down in your own words what the problem was.
(1)
11.3
What is an investigative question?
(1)
11.4
What is optical fiber?
(1)
11.5
To look inside a patient’s body a doctor uses an endoscope.
The hollow core of an endoscope is surrounded by two layers
of plastic. The refractive index of the inner layer is higher than that of
the outer layer.
(a)
Give a reason why the refractive index of the inner layer must
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(b)
11.6
be higher.
(1)
Write down the medical advantage that endoscopes offer doctors.
(1)
Give one advantage that optical fiber has over copper in the
transmission of information over long distances.
(1)
In an experiment to verify Snell’s Law for light passing from air through
an optical medium, a group of learners obtained the following results:
Sin i (in air)
Sin r (in the optical
medium)
11.7
0,263
0, 173
0, 393
0, 195
0, 519
0, 342
One of the values for Sin r in the table is incorrect.
Perform calculations to find out which value it is.
(5)
(Approximate each calculation’s answer correct to the second decimal place.)
11.8
Calculate what the correct value of the incorrect Sin r value in
question 11.7 is. (Approximate your answer correct to the third decimal place.)
11.9
(2)
Use the table below to identify the substance through which the
learners shone the light in the experiment.
Substance
Refractive index (n)
Water
1, 33
Glass
1, 52
Diamond
2, 42
(2)
[17]
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QUESTION 12
Begin on a new page
A scientist was asked to explain how magnetic domains come about.
Read the following paragraph that gives the scientist’s answer and then answer
the questions that follow.
HOW MAGNETIC DOMAINS ORIGINATE
All substances are made from atoms. In an atom electrons travel around a
nucleus whilst spinning on their axes, just like the earth as it travels around the
sun. An electron that is spinning generates a magnetic field around itself. Two
electrons can only occupy the same orbital if they have opposite spin – this
makes their combined magnetic field very weak. In the case of atoms that have
unpaired valence electrons, the magnetic fields of the spinning electrons are
always present in the atom. These atoms are called atomic dipoles. Groups of
atomic dipoles can form domains of magnetism in a substance called magnetic
domains. Ferromagnetic materials contain many atomic dipoles and magnetic
domains. Ferromagnetic material can be attracted by magnets and can also be
magnetized.
12.1
Define a magnetic field.
(2)
12.2
Consider the list of substances provided below.
Glass
Iron
Sodium
Nickel
Magnesium
Cobalt
Water
Choose from the list:
(Only write the number of the question and your answer next to it. A substance in
the list can only be used once.)
(a)
All the substances that are ferromagnetic
(3)
(b)
A substance that is paramagnetic
(1)
(Paramagnetic substances have atomic dipoles but do not form
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magnetic domains)
(c)
Two substances that are diamagnetic
(2)
(Diamagnetic substances move away from a magnetic field)
(d)
12.3
A substance that is not ferromagnetic
(1)
A non-magnetised steel bar is not yet a magnet.
(a)
Give an explanation for this in terms of magnetic domains.
(b)
Describe in terms of magnetic domains, what happens when the
(2)
steel bar becomes magnetised.
(2)
[13]
QUESTION 13
Begin on a new page
Read the following paragraph and then answer the questions that follow.
THE IMPACT OF MAGNETISM ON ANCIENT PEOPLE
The name magnet comes from a place called Magnesia in Asia Minor. Here the
ancient Greeks found a dark mineral called loadstone (magnetite) that can attract
iron. A bar of this mineral suspended horizontally from a thread comes to rest
pointing north and south. Many ancient people believed that loadstone had medical
powers. During the 12th century loadstone was used in Europe to indicate direction.
In modern times people use magnets and magnetism every day of their lives.
13.1
Write down two uses of loadstone by ancient people.
(2)
13.2
Name the nation that first knew that loadstone could attract iron.
(1)
13.3
Write down three uses of magnets that have improved the lives of people
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in modern times.
(3)
When the needle of a compass comes to rest it also points to north and
south. Study the diagram below that shows how the geographical and
magnetic poles differ from each other. Points A, B and C represent poles
other than geographical north. The lines joining the points are called
meridians. The earth’s magnetic field acts as if there was a giant
bar magnet lying along the meridian AC, represented by the rectangle
with broken lines.
Geographical North Pole
A


B C
13.4
Name each of the poles A, B and C respectively.
(3)
13.5
What is the name given to the angle ?
(1)
13.6
Write down one difference between the geographical north pole and the
magnetic north pole.
13.7
(2)
Draw the rectangle in your Answer Book. Draw the magnetic field
lines around it to show the shape of the earth’s magnetic field and
indicate the north and south poles associated with this magnetic field
in the rectangle. Show the direction of all the magnetic field lines.
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(3)
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QUESTION 14
Begin on a new page
You are competing in an Expo for young scientists. You are given a resistor of
unknown resistance. Your first task is to plan an investigation to determine its
resistance without using the equation R =
V
. You are told that the use of
I
an ohmmeter and an ammeter are not allowed.
14.1
Make a sketch to show the circuit diagram that you will use in your plan
to do the investigation. Indicate each component in the circuit with its correct
circuit symbol.
14.2
(8)
Name the variable in your investigation that is the:
(a)
Control
(1)
(b)
Dependent variable
(1)
(c)
Independent variable
(1)
[11]
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TOTAL SECTION B:
115
GRAND TOTAL:
150
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DATA FOR PHYSICAL SCIENCES GRADE 10
P1 PHYSICS / FISIKA
GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11
TABLE 1: PHYSICAL CONSTANTS / TABEL 1: FISIESE KONSTANTES
NAME / NAAM
Accelaration due to gravity
Swaartekragversnelling
SYMBOL / SIMBOOL
VALUE / WAARDE
9,8 m·s-2
g
TABLE 2: FORMULAE / TABEL 2: FORMULES
AREA
Area of triangle = ½ b x h
Area van driehoek
Area of rectangle = ℓ x b
Area van reghoek
MOTION / BEWEGING
v f  vi  a t
v f 2  vi2  2ax
v =
1
at 2
2
 v  vi 
x   f
 t
 2 
x  vit 
Δs
Δt
FORCE AND LAWS OF MOTION / KRAG EN WETTE VAN BEWEGING
w  mg
WORK AND ENERGY / ARBEID EN ENERGIE
ME = U + K = Ep + Ek
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U = Ep = mgh
K = Ek = ½ mv2
WAVES, LIGHT AND SOUND / GOLWE, LIG EN KLANK
vf
T
1
f
n1sin θ1 = n2sin θ2
ELECTRICITY AND MAGNETISM / ELEKTRISITEIT EN MAGNETISME
V
I
Q = It
R
R s  R1  R 2  ...
1
1
1


 ...
Rp R1 R 2
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