NAMIBIA SENIOR SECONDARY CERTIFICATE DESIGN AND …NAMIBIA SENIOR SECONDARY CERTIFICATE DESIGN AND TECHNOLOGY ORDINARY LEVEL 4129/1 PAPER 1 2 hours Marks 100 2013 ... opener in first

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Centre Number Candidate Number Candidate Name

NAMIBIA SENIOR SECONDARY CERTIFICATE

DESIGN AND TECHNOLOGY ORDINARY LEVEL 4129/1PAPER 1 2 hours

Marks 100 2013Additional Materials: A3 drawing paper for Question 11 only Standard drawing equipment A non-programmable calculator

This document consists of 26 printed pages and 2 blank pages.

Republic of NamibiaMINISTRY OF EDUCATION

© MoE/DNEA 4129/1/13

INSTRUCTIONS AND INFORMATION TO CANDIDATES

• Write your Centre Number, Candidate Number and Name in the spaces at the top of this page and on all separate answer sheets used.

• Write in dark blue or black pen.• You may use a soft pencil for any rough work, diagrams or graphs.• Donotusecorrectionfluid.• Do not write in the margin For Examiner’s Use.• You may use blank pages for workings or when answers are crossed out and corrected. • The number of marks is given in brackets [ ] at the end of each question or part question.• You may use a non-programmable calculator.

Part A• Answer all questions.• Write your answers in the spaces provided on the question paper.

• You should spend about 30 minutes on Part A.

Part B• Answer one question.• Question 11 should be answered on the separate A3 drawing paper. • At the end of the examination fasten your A3 work to this question paper.• Question 12 and 13 should be answered in the spaces provided on the

question paper.

For Examiner’s Use

Part A

Part B

TOTAL

11 ............12 ............13 ............

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Part A

Answer the questions from Part A in the spaces provided.

1 (a) Barrier creams are essential in a workshop.

Give two functions of barrier creams.

1 .....................................................................................................................

.....................................................................................................................

2 .....................................................................................................................

..................................................................................................................... [2]

(b) Fig. 1 shows the effect of working with faulty electricity connections.

Fig. 1

Describe how a person should be treated when shocked by electricity.

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2 Fig. 2 shows how discarded tyres could be recycled into useful products.

Fig. 2

Suggest two other possible uses for discarded tyres.

1 ............................................................................................................................

............................................................................................................................

2 ............................................................................................................................

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3 Fig. 3 shows a graph of the results of an interview of 50 people about the features of two products.

prod

uct 2

prod

uct 1

prod

uct 2

colour texture

10

20

30

40

50

0

prod

uct 1

num

ber o

f peo

ple

Fig. 3

(a) Write down the approximate number of people that liked the colour of product 1.

............................................................................................................................ [1]

(b) Calculate the approximate percentage (%) of people that liked the texture of product 2.

[3]

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4 Fig. 4 shows a computer mouse. casing

scroll wheel

Fig. 4

(a) The casing could be made from a plastic.

Describe a process that could be used to produce the casing.

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(b) Discuss two ergonomic features the designer considered in the design of the computer mouse.

feature 1 ..............................................................................................................

..............................................................................................................

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feature 2 ..............................................................................................................

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5 State two advantages of making models and mock-ups before making the actual product.

1 ............................................................................................................................

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2 ............................................................................................................................

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6 List four items of information that should be included when compiling a production schedule for the manufacturing of a product.

1 ............................................................................................................................

2 ............................................................................................................................

3 ............................................................................................................................

4 ............................................................................................................................ [4]

7 Fig. 5 shows a bottle opener made from metal.

R10

Ø4

3

520

R2

R225

80

Fig. 5

(a) Project and draw, using the space provided in Fig. 5, a scale 1:1 top view of the opener in first angle orthographic projection. Show all hidden detail. [4]

(b) The Ø4 hole could be drilled, using a portable electric drill.

State two safety precautions that should be considered when drilling the hole.

1 .....................................................................................................................

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2 .....................................................................................................................

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8 Explain how technology has improved communication between human beings living far apart.

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9 Fig. 6 shows a candle holder. The base is made from a hardwood and the frame from mild steel.

mild steel frame

hardwood base

Fig. 6

(a) Use a sketch and notes to show a possible method of joining the base to the frame.

[3]

(b) Evaluate the candle holder in terms of aesthetics.

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10 Fig. 7 shows a sectional view of a one cylinder engine.valve

spark plug

piston

cylinder head

cylinder block

Fig. 7

Complete the following sentences by underlining the correct word or words in brackets, ( ), to make the statement true.

(a) The engine in Fig. 7 runs on (solar power, fossil fuel, wind power) and the energysourceisregardedas(nonrenewable,finite,renewable). [2]

(b) In Fig. 7, potential energy is converted into (light energy, kinetic energy). [1]

[40]


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Part B

Answer one question from Part B.

11 Design Communication (pages 8 to 10 of this booklet)

Answer the whole of this question on separate A3 drawing paper.

Fig. 8 shows two principal views and an exploded isometric view of the parts of a pawl assembly.

ITEM 1

Ø20Ø20

6020

40

Ø36

40

90

40

30

ITEM 5

120

4030

R10

R10

Ø20

30

ITEM 3

Ø36

Ø16

ITEM 4

Ø5

24

ITEM 2

60 16

5 5Ø5 hole Ø20

Ø16

Ø36

BB

X

A

ITEM 1

ITEM 5

ITEM 2

ITEM 3ITEM 4

8

60

R40

Fig. 8

The two principal views are drawn in first angle orthographic projection and show:

• ITEM 1 - one angle bracket;

• ITEM 2 - one swivel pin;

• ITEM 3 - one washer;

• ITEM 4 - one pin;

• ITEM 5 - one pawl.

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(a) Draw, in first angle orthographic projection, a full size assembled drawing showing:

(i) an outside front view as seen in the direction of arrow A, showing all hidden detail; [12]

(ii) a full sectional top view on the cutting plane, B-B, passing through the centre of ITEM 2, the swivel pin; [12]

(iii) the projection symbol; [1](iv) six dimensions. [3]

(b) Draw an approximate full size freehand isometric drawing of ITEM 1, the angle bracket.

X

Fig. 9

Arrange your isometric view so that the surface marked "X" in the exploded view in Fig. 8, is in the position shown in Fig. 9.

Shade your isometric view so that it has a shiny metal appearance. [10]


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(c) Fig. 10 shows a front view and an auxiliary view of a part of a chimney that consists of a truncated prism with a regular hexagonal base.

300

800

45O

joint onshortest side

Fig. 10

Draw to a scale 1:10:

(i) the given views; [6](ii) the true shape of the truncated section; [6](iii) the development (net) of the truncated prism. Allow for a joining tab at the

side indicated in Fig. 10. [10]

[60]

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12 Resistant Materials (pages 11 to 19 of this booklet)

Answer Question 12 in the spaces provided on the question paper

(a) Fig. 11 shows products made from thermosetting plastic.

Fig. 11

(i) Nameaspecific thermosettingplastic thatcouldbeused toproduce theproducts in Fig. 11.

..................................................................................................................... [1]

(ii) Thespecificplasticnamedin(i), has the following properties: brittleness, good insulator and hardness.

Define:

brittleness. ....................................................................................................

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..................................................................................................................... [2]

hardness. .....................................................................................................

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(b) Tables 1, 2 and 3 show three plastic products.

Ineachcase,completethetablebyfillinginthenameofaspecificplasticanda brief description of the process for production of the product.

Table 1: toothbrush holder

specificplastic description of production process profileofproduct

.......................

.......................

.......................................................

........................................................

.......................................................

.......................................................

[4]

Table 2: grip for bicycle handle


.......................

.......................

.......................................................

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.......................................................

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[4]

Table 3: hollow tricycle wheel


.......................

.......................

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[4]

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(c) Expanded polystyrene is a very versatile material. Fig. 12 shows an expanded polystyrene insert used for packaging.

expanded polystyrene insert

BOX

Fig. 12

Some of the many products made from this material are listed below. For each product, describe the properties which make expanded polystyrene particularly suitable for the application.

(i) packaging for electrical equipment.

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..................................................................................................................... [2]

(ii) swimmingfloat.

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(iii) picnic cool box.

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(d) Fig. 13 shows the basic shape of a toy train made from a hardwood. The front roller can be steered by turning the chimney stack left or right.

front roller

chimney stack

boiler

Fig. 13

(i) Name a suitable hardwood from which the toy could be made.

..................................................................................................................... [1]

(ii) Use sketches and notes to show how the rear wheels could be produced. Include measuring and marking out, as well as the cutting/forming of the wheels, referring to the tools and equipment used.

[3]

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(iii) Devise a means of connecting the chimney stack to the front roller, enabling it to rotate freely and to be steered.

Include details of materials and constructions that could be used.

[5]

(iv) Suggestanddescribeafinishingmethodforthetoy.

.....................................................................................................................

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(e) A nesting box for small birds is shown in Fig. 14. The box is to be made from wood.

Fig. 14

(i) Show, using sketches and notes, how access could be gained to the inside of the box to prepare it for use in the following year.

[4]

(ii) Suggest a method to make the large hole for the nest box.

.....................................................................................................................

..................................................................................................................... [1]

(iii) Describe the method suggested in (ii).

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(f) Fig. 15 shows a small stepladder.

framework

X

step

back legs

Fig. 15

The framework is made of metal tubing.

(i) Name a metal that could be used to make the steps.

.................................................................................................................. ... [1]

(ii) List twospecificationsthedesignercouldhaveconsideredwhendesigningthe ladder.

1 ..............................................................................................................

..............................................................................................................

2 ..............................................................................................................

.............................................................................................................. [2]

(iii) Use sketches and notes to show how the back legs could be attached to the framework at X so that they swivel.

Show all major detail and construction methods.

[4]


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(iv) Suggestanddescribeafinishingmethod for the frameworkapart frompainting.

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(g) Fig. 16 shows a small coffee table.

wooden top

metal frame

Fig. 16

The table top is made from wood, while the legs are made from metal.

(i) Suggest a metal that could be used for the legs, giving one reason for your choice.

.....................................................................................................................

..................................................................................................................... [2]

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(ii) Using sketches and notes, show how:

1 the legs could be attached to the top;

[3]

2 the height of the table could be adjusted.

[3]

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13 Technology (pages 20 to 26 of this booklet)

Answer Question 13 in the spaces provided on the question paper.

(a) Fig. 17 shows a bicycle.

chain wheelrear cog

headlight

framework

chain

brake

Fig. 17

(i) Name two working parts of the bicycle shown in Fig. 17 which are levers.

1 ..............................................................................................................

..............................................................................................................

2 ..............................................................................................................

.............................................................................................................. [2]

(ii) State three advantages that a chain drive will have over a belt drive in this application.

1 ..............................................................................................................

..............................................................................................................

2 ..............................................................................................................

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3 ..............................................................................................................

.............................................................................................................. [3]

(iii) Add arrows to Fig. 17 to show four places where friction is encountered in the bicycle. [4]

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(iv) Explain why friction is an advantage to the cyclist on two areas or parts of the bicycle.

1 ..............................................................................................................

..............................................................................................................

2 ..............................................................................................................

.............................................................................................................. [4]

(v) On the bicycle shown in Fig. 17, the chain wheel has 48 teeth and the rear cog has 12 teeth.

Calculate the gear ratio.

[3]

(vi) Referring to the framework of the bicycle, give two reasons why the frame is shaped this way.

1 ..............................................................................................................

..............................................................................................................

2 ..............................................................................................................

.............................................................................................................. [2]

(vii) The headlight of the bicycle is powered by 4 x 1.5 volt batteries, connected inseries,andtheresistanceofthelightbulbis2Ω.

Calculatethecurrentthatflowsinthecircuit.

[3]


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(viii) Using the correct symbols, draw a simple line diagram of the headlight circuit with a toggle switch included.

[4]

(ix) In the bicycle braking system, an effort of 5N is applied to the brake lever. The lever moves through 50 mm and the brake blocks through 10 mm. The load is 10N. Calculate

1 the mechanical advantage;

[3]

2 the velocity ratio;

[3]

3 theefficiencyofthesystem.

[3]

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(b) Fig. 18 shows a card model of a funny face operated with levers. The ears should oscillate while the hat should reciprocate as indicated by the arrows.

Fig. 18

Show, by means of a simple lever system, how the above motions could be achieved.

Label all important parts.

[5]


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(c) Completethetablebelowbyfillinginthenameoftheelectroniccomponentandproviding the correct symbol in each case.

Diagram Name Symbol

(i) ........................................... (ii)

(iii) ........................................... (iv)

(v) ........................................... (vi)

(vii) ........................................... (viii)

[8]

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(d) Fig. 19 shows two circuit diagrams A and B. The two resistors in circuit B have aresistanceof2Ωand3Ωrespectively.

light bulb

battery

1.5 V

A B

resistorlight bulb

battery

resistor2Ω 3Ω

2Ω

1.5 V 1.5 V1.5 V

Fig. 19

(i) Calculate the total value of the resistors in circuit B.

[3]

(ii) Tick the correct box in the following statement:

In circuit A the bulb will glow:

brighter ;

dimmer

than the bulb in circuit B. [1]

(e) Use a sketch and notes to explain the operation of an NPN transistor.

[4]


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(f) Fig. 20 shows a touch sensitive circuit diagram.

Studythediagramandexplainbrieflytheoperationofthecircuit.

touch plates

BC108

9V battery

relay coil

2.2kΩ

47kΩ

BC108

1N4001

+

-

Fig. 20

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Documents

NAMIBIA SENIOR SECONDARY CERTIFICATE DESIGN AND …NAMIBIA SENIOR SECONDARY CERTIFICATE DESIGN AND TECHNOLOGY ORDINARY LEVEL 4129/1 PAPER 1 2 hours Marks 100 2013 ... opener in first