Physical Science P1 Additional Exemplar Eng 2008

7/28/2019 Physical Science P1 Additional Exemplar Eng 2008

1/19

NSC

Copyright reserved Please turn over

MARKS: 150

TIME: 3 hours

This question paper consists of 14 pages, 3 data sheets and 1 answer sheet.

PHYSICAL SCIENCES: PHYSICS (P1)

ADDITIONAL EXEMPLAR 2008

GRADE 12

NATIONALSENIOR CERTIFICATE


2/19

Physical Sciences/P1 2 DoE/Additional Exemplar 2008NSC


INSTRUCTIONS AND INFORMATION

1.

2.

3.

4.

5.

6.

7.

8.

9.

Write your examination number (and centre number if applicable) in theappropriate spaces on the ANSWER SHEET and ANSWER BOOK.

Answer ALL the questions.

Answer SECTION A on the attached ANSWER SHEET.

Answer SECTION B in the ANSWER BOOK.

Non-programmable calculators may be used.

Appropriate mathematical instruments may be used.

Number the answers correctly according to the numbering system used in thisquestion paper.

Data sheets are attached for your use.

Give brief motivations, discussions, et cetera where required.


3/19


4/19



QUESTION 3: TRUE/FALSE ITEMS

Indicate whether the following statements are TRUE or FALSE. Choose the answerand write 'true' or 'false' next to the question number (3.1 3.5) on the attachedANSWER SHEET. Correct the statement if it is FALSE.

3.1

3.2

3.3

3.4

3.5

A long cannon will impart a greater impulse to a cannonball than a shortcannon because the force acts over a longer time.

The light bands produced by red light through a double slit is narrower thanthe bands produced by blue light.

Halving the distance between two stationary charges doubles theelectrostatic force that the charges exert on each other.

A DC generator produces a constant direct current similar to that producedby a battery.

Laser light is coherent, monochromatic, sharply focussed and highlydirectional.

(2)

(2)

(2)

(2)

(2)[10]


5/19



QUESTION 4: MULTIPLE-CHOICE QUESTIONS

Four options are provided as possible answers to the following questions. Eachquestion has only ONE correct answer. Choose the answer and make a cross (X) inthe block (A D) next to the question number (4.1 4.5) on the attached ANSWER

SHEET.

4.1 A boy, mass 2m, and a girl, mass m, are facing each other on roller skates.With their hands, they push off against one another. The boy experiences aforce F and an acceleration a to the left.

Which ONE of the following best describes the magnitudes of the force andacceleration experienced by the girl? Ignore the effects of friction.

FORCE ACCELERATION

A2

1F 2a

B F 2a

C F 2

1

a

D 2F2

1a

(3)


6/19



4.2 A stone is dropped from the edge of a cliff. Which ONE of the followinggraphs best represents the change in kinetic energy of the stone during itsfall?

A B

C D

(3)

4.3 A circus clown wears a yellow jacket and a red nose. Which ONE of thefollowing correctly describes the colour of the jacket and the nose of the clownwhen illuminated with cyan light?

JACKET NOSE

A blue redB green black

C cyan black

D green cyan (3)

t(s)

Ek

t(s)

Ek

t(s)

Ek

t(s)

Ek


7/19



4.4 A battery with emf and internal resistance ris connected to a resistorR asshown in the circuit diagram below.

A second resistor of the SAME RESISTANCE is now connected in parallelwith resistorR.

How will the voltmeter and ammeter readings change when the secondresistor is connected in the circuit?

VOLTMETER READING AMMETER READING

A stays the same decreases

B increases stays the same

C decreases increases

D increases increases (3)

4.5 The energy level diagram for an element is shown below. E0 represents theground state. The energy change from E0 to E1 is smaller than that for E2 to

E1.

The electron transition from E2 to E1 corresponds to a green line in theelement's spectrum. The transition E0 to E1 corresponds to ...

A

B

C

D

absorption of green light.

emission of green light.

emission of red light.

absorption of red light. (3)[15]

TOTAL SECTION A: 35

R

r

V

A

E2

E1

E0


8/19



SECTION B

INSTRUCTIONS AND INFORMATION

1.

2.

3.

Answer SECTION B in the ANSWER BOOK.

The formulae and substitutions must be shown in ALL calculations.

Round off your answers to TWO decimal places where applicable.

QUESTION 5

Any falling object which is being acted upon only by the force of gravity is said to bein a state offree fall.

5.1 Briefly describe how you can make use of a small free-falling stone todetermine how deep the water level is in a well (represented by y in thediagram below).

(3)

5.2 Give ONE reason why the concept of free fall might not give a correctanswer. (1)

5.3 A student is at the top of a building of height h. He throws a stone, X, upwardwith a speed v. He then throws a second identical stone, Y, downward at thesame speed v.

5.3.1 Redraw the following set of axes in the ANSWER BOOK andsketch the graphs of position versus time for each of the stones Xand Y. Use the ground as the point of zero position.

(4)

5.3.2 How will the velocities of the two stones, X and Y, compare whenthey reach the ground? Explain your answer. (4)

t(s)

P

osition

m

water

y


9/19



5.4 A mountain climber stands at the top of a 50 m cliff that overhangs a calmpool. She throws two stones vertically downward 1 s apart and observesthat the two stones reach the water simultaneously after a while. The firststone was thrown at an initial speed of 2 ms-1.

Calculate the initial speed at which she threw the second stone. Ignore theeffects of friction. (6)

[18]

QUESTION 6

New cars have a crumple zone to help minimise injuries during accidents. In additionseat belts, air bags and padded interiors can reduce the chance of death or seriousinjury.

6.1 Use principles in Physics to explain how air bags can reduce the chance ofdeath or injury. (3)

6.2 In a crash test, a car of mass 1,2 x 103 kg collides with a wall and reboundsas illustrated below. The initial and final velocities of the car are 12 ms-1 tothe left and 2 ms-1 to the right respectively. The collision lasts 0,1 s.

Calculate the:

6.2.1

6.2.2

Impulse of the car during the accident

Average force exerted on the car

(4)

(3)

6.3 How will the magnitude of the force exerted on the car be affected if the timeinterval of the collision remains 0,1 s, but the car does not bounce off thewall? Write down only INCREASES, DECREASES or REMAINS THESAME. Explain your answer. (2)

[12]

12 ms-1 2 ms-1


10/19



QUESTION 7

A gymnast jumps vertically upward from a trampoline as illustrated below.

The gymnast leaves the trampoline at a height of 1,3 m and reaches a maximumheight of 5 m. Ignore the effects of friction.

7.1 Write down the work-energy theorem. (2)

7.2 Use energy principles to calculate the initial speed vi with which the gymnastleaves the trampoline. (5)

[7]

QUESTION 8

The sketch below shows a stationary ambulance. The siren of the ambulance emitssound waves of frequency 700 Hz.

The driver of a car approaching the ambulance and passing it at constant speed,observes the frequency of the emitted sound waves to change by 80 Hz.

8.1 Name and state the wave phenomenon illustrated above. (3)

8.2 Take the speed of sound in air as 340 ms-1

and calculate the speed at whichthe car passes the ambulance. (5)

[8]

700 Hz

Stationary ambulance

Car passing at constant speed

5 m

1,3 m

vi


11/19


12/19



QUESTION 10

A capacitor's function is to store charge or electrical energy. Capacitors also functionas filters, passing alternating current (AC) and blocking direct current (DC).

10.1 Briefly explain how a capacitor can block direct current (DC). (2)

10.2 You are requested to design a parallel plate capacitor with a capacitance of200 pF using the following materials:

Two connecting wires A whole sheet of aluminium foil of area 0,2 m2

Use the following steps as guidance in your design:

10.2.1

10.2.2

10.2.3

Calculate the distance between the plates of the capacitor.

Make a sketch of your design and indicate the dimensions of thecapacitor on the sketch.

What change will you make to your design, still using all thesupplied materials, to change the capacitance of the capacitor to100 pF?

(4)

(4)

(1)

10.3 Supercapacitors (capacitors of 1 farad and more) are well suited to replacebatteries in many applications. This is because their scale is comparable tothat of batteries at the moment, from small ones used in cellular phones tolarge ones that can be found in cars. Even though supercapacitors have a

lower energy density compared to batteries, they avoid many of thedisadvantages of batteries.

10.3.1

10.3.2

10.3.3

Compare the way in which capacitors and batteries store energy.

Name ONE disadvantage of batteries when disposed of in theenvironment.

The following statement appears in an advertisement of a certaintype of battery:

'Capacitors cannot function without batteries they need a source

of energy. On the other hand, batteries dont need capacitors.'

Briefly explain why this is a valid statement.

(2)

(1)

(2)[16]


13/19



QUESTION 11

Four resistors of different resistances are connected in a circuit as shown below. Thebattery has an emf of 30 V and an internal resistance of 2 . The resistance of theconnecting wires is negligible.

11.1 Define the concept emfof a battery. (2)

11.2 Calculate the potential difference between points X and Y. (7)[9]

QUESTION 12

The average power of a lamp is 15 W. The lamp can be used with either an ACsupply or a DC supply. The graph below shows the AC potential difference.

12.1 Calculate the potential difference of a DC supply that will produce the samebrightness of the lamp. (3)

12.2 Calculate the peak current through the lamp when connected to a 12 V ACsupply. (4)

12.3 Draw a sketch graph of current through the lamp against time whenconnected to the AC supply. Indicate the value of the peak current on thegraph. (3)

[10]

2

10 6 4

6

= 30 V

yyX Y

12

-12

time (s)

potentialdifference(V)


14/19


Copyright reserved

QUESTION 13

The diagram below shows a basic electric generator.

13.1

13.2

13.3

What type of generator (AC or DC) is illustrated above? Give a reason foryour answer.

Is the induced potential difference in the coil illustrated above about toincrease or to decrease? Refer to the change in magnetic flux as the looprotates from the vertical to the horizontal position, and explain your answer.

State ONE change that can be made to the above generator to increase theoutput potential difference.

(2)

(5)

(1)[8]

QUESTION 14

A learner wants to demonstrate the photoelectric effect. He uses a disk of zincplaced on an electroscope. The work function of zinc is 6,9 x 10-19 J.

14.1 Define the concept work function. (2)

14.2 Calculate the maximum wavelength of light that will eject electrons from thezinc. (4)

14.3 The electroscope is negatively charged and then exposed to ultraviolet lightfrom a mercury discharge lamp. One of the wavelengths of the light is260 nm.

Calculate the kinetic energy of an electron emitted from the zinc disk by aphoton of this light. (4)

14.4 When the student attempts the experiment with a positively chargedelectroscope, he finds that the ultraviolet light has no apparent effect.Explain this observation. (2)

[12]

TOTAL SECTION B:

GRAND TOTAL:

115

150

S

N


15/19

Fisiese Wetenskappe/V1 DoE/Additional Exemplar 2008NSS

Copyright reserved

NATIONAL SENIOR CERTIFICATENASIONALE SENIOR SERTIFIKAAT

DATA FOR PHYSICAL SCIENCES GRADE 12PAPER 1 (PHYSICS)

GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12VRAESTEL 1 (FISIKA)

TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES

NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE

Acceleration due to gravitySwaartekragversnelling

g 9,8 ms-2

Speed of light in a vacuum

Spoed van lig in 'n vakuumc 3,0 x 108 ms-1

Planck's constantPlanck se konstante

h 6,63 x 10-34 Js

Gravitational constantSwaartekragkonstante

G 6,67 x 10-11 Nm2kg-2

Coulomb's constantCoulomb se konstante

k 9,0 x 109 Nm2C-2

Charge on electronLading op elektron

e -1,6 x 10-19 C

Electron massElektronmassa

me 9,11 x 10-31 kg

Permittivity of free spacePermittiwiteit van vry ruimte 0 8,85 x 10

-12

Fm-1

Permeability of free spacePermeabiliteit van vry ruimte 0

4 x 10-7 TmA-1


16/19

Physical Sciences/P1 DoE/Additional Exemplar 2008NSC


TABLE 2: FORMULAE/TABEL 2: FORMULES

MOTION/BEWEGING

tavv if += 2

21

i tatvx += or/of2tatvy

21

i +=

xa2vv 2i2

f += or/of yavv if += 222

tvvxif

+=

2or/of tvvy if

+=

2

FORCE/KRAG

maFnet = mvp=

ifnet mvmvptF == mgFg =

WORK, ENERGY AND POWER/ARBEID,ENERGIE EN DRYWING

xFW = cos U = mghEP = 2

k mv2

1EK == kikfk EEEKW ===

t

WP

= FvP=

WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG

= fv or/of v f

1T = or/of

=

1T

ss

L

L fvv

vv

f

= hfE= or/of =hE or/of =

c

hE

vm

h= sin

a

m=

2

02

1

2

1mvhfmvWhf 20 +=+=

MATTER AND MATERIALS/MATERIE EN MATERIALE

xkF = Stress/SpanningA

F=

Strain/Vervormingl

x=


17/19



ELECTRICITY AND MAGNETISM/ELEKTRISITEIT EN MAGNETISME

2

maxrms

II = /

2

makswgk

II =

2VV maxrms = /

2VV makswgk = t

N =

= BA

Paverage = VrmsIrms/ Pgemiddeld= VwgkIwgk

Paverage =R

V 2rms / Pgemiddeld=R

V 2wgk

Paverage = I2rmsR / Pgemiddeld= I

2wgkR

ELECTROSTATICS/ELEKTROSTATIKA

2

21

r

QkQF=

2r

kQE =

d

VE =

r

QkQU 21=

q

FE = ItQ =

C =V

Q C =

d

A0

ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE

I

VR= ...

R

1

R

1

R

1

21p

++=

...RRR 21s ++= emf/emk( ) = I(R + r)


18/19


Copyright reserved

EXAMINATION NUMBER

ANSWER SHEET/ANTWOORDBLAD

QUESTION 1/VRAAG 1

1.1 (1)

1.2 (1)

1.3 (1)

1.4 (1)

1.5 (1)[5]

QUESTION 3/QUESTION 3

QUESTION 2/VRAAG 2

2.1 (1)

2.2 (1)

2.3 (1)

2.4 (1)

2.5 (1)[5]

3.1

3.2

3.3

3.4

3.5

(2)

(2)

(2)

(2)

(2)[10]

QUESTION 4/VRAAG 4

4.1 A B C D

4.2 A B C D

4.3 A B C D

4.4 A B C D

4.5 A B C D(5 x 3) [15]

TOTAL SECTION A/TOTAAL AFDELING A: 35


19/19

Physical Science P1 Additional Exemplar Eng 2008

Documents

Transcript of Physical Science P1 Additional Exemplar Eng 2008