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JUNE EXAMINATION PAPER

GRADE 10

PHYSICAL SCIENCES P1PHYSICS

JUNE 2012

PSC P1 Gr10 CAPS

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.

Copyright reserved Please turn over2

PSC P1 Gr10 CAPS

SECTION AAnswer 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 COLUMN B2.1 Energy a moving object has A Positive

B Radio waves

2.2 Rate of change in velocity. C Iron

D EK

2.3 An example of a transverse wave. 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]


PSC P1 Gr10 CAPS

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. (2)

3.2 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]


PSC P1 Gr10 CAPS

QUESTION 4: MULTIPLE CHOICE QUESTIONSFour 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 …

A equal to v m.s-1

B less than v m.s-1

C greater than v m.s-1 (3)

4.2 A sphere falls freely from rest near the earth’s surface. Which one of the

following remains constant as it falls? Its …

A displacement

B velocity

C acceleration

D kinetic energy (3)

4.3 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 1x

C x 12x

D 1/x x


(3)

5

PSC P1 Gr10 CAPS

4.4 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:

A 25o

B 30o

C 60o

D 150o (3)

4.5 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

2x

C equal to ( x+ x )2

D less than X (3)

[15]TOTAL SECTION A: [35]


v (m.s-1)

t (s)39

90

0A

B C

D

PSC P1 Gr10 CAPS

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.

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)

5.2 Calculate the car’s final displacement from A when it reached D. (4)


18 27

7

PSC P1 Gr10 CAPS

5.3 Draw an acceleration versus time graph to show the motion

of the car from A to D. (4)

(Numerical data on the axes is not required) [13]


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. (2)

7.2 Calculate the magnitude of the gravitational acceleration on planet X. (2)


PSC P1 Gr10 CAPS

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.

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)

[7]


SPEED KILLS

9

Incident pulse

Reflected pulse

PSC P1 Gr10 CAPS


A pulse traveling along a rope is reflected at one end. The diagram below shows

the direction of the incident and reflected pulses.

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]


4 m

20 cmA

B

C

D

PSC P1 Gr10 CAPS


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.

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]


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

reflection of light can take place between two optical media. (2)


PSC P1 Gr10 CAPS

Read the following paragraph and then answer the questions that follow.

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

be higher. (1)


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.

12

PSC P1 Gr10 CAPS

(b) Write down the medical advantage that endoscopes offer doctors. (1)

11.6 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)

0,263 0, 173

0, 393 0, 195

0, 519 0, 342

11.7 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.) (2)

11.9 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]


PSC P1 Gr10 CAPS


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.

12.1 Define a magnetic field. (2)

12.2 Consider the list of substances provided below.

Glass Iron Sodium Water

Nickel Magnesium Cobalt

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

magnetic domains)


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.

14

PSC P1 Gr10 CAPS

(c) Two substances that are diamagnetic (2)

(Diamagnetic substances move away from a magnetic field)

(d) A substance that is not ferromagnetic (1)

12.3 A non-magnetised steel bar is not yet a magnet.

(a) Give an explanation for this in terms of magnetic domains. (2)

(b) Describe in terms of magnetic domains, what happens when the

steel bar becomes magnetised. (2)

[13]


Read the following paragraph and then answer the questions that follow.

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

in modern times. (3)


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.

15

A

B C

Geographical North Pole

PSC P1 Gr10 CAPS

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.

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. (2)

13.7 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. (3)[15]


PSC P1 Gr10 CAPS


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 =

VI . You are told that the use of

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. (8)

14.2 Name the variable in your investigation that is the:

(a) Control (1)

(b) Dependent variable (1)

(c) Independent variable (1)

[11]TOTAL SECTION B: 115 GRAND TOTAL: 150


PSC P1 Gr10 CAPS

DATA FOR PHYSICAL SCIENCES GRADE 10P1 PHYSICS / FISIKA

GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11

TABLE 1: PHYSICAL CONSTANTS / TABEL 1: FISIESE KONSTANTES

NAME / NAAM SYMBOL / SIMBOOL VALUE / WAARDEAccelaration due to gravitySwaartekragversnelling g 9,8 m·s-2

TABLE 2: FORMULAE / TABEL 2: FORMULES

AREA

Area of triangle = ½ b x hArea van driehoek

Area of rectangle = ℓ x bArea van reghoek

MOTION / BEWEGING

v f=vi+a Δt Δx=v i Δt+12aΔt2

vf 2=v

i2+2aΔx Δx=( v f + vi

2 ) Δt

v =

ΔsΔt

FORCE AND LAWS OF MOTION / KRAG EN WETTE VAN BEWEGING

w=mg

WORK AND ENERGY / ARBEID EN ENERGIE

ME = U + K = Ep + Ek U = Ep = mgh


PSC P1 Gr10 CAPS

K = Ek = ½ mv2

WAVES, LIGHT AND SOUND / GOLWE, LIG EN KLANK

v=f λ T = 1f

n1sin θ1 = n2sin θ2

ELECTRICITY AND MAGNETISM / ELEKTRISITEIT EN MAGNETISME

Q = It R = VI

R s=R1+R2+ .. .1R p

= 1R1

+ 1R2

+ . ..


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