MOCK EXAMINATION 1999

SECONDARY TWO EXPRESS

DESIGN AND TECHNOLOGY

Answers to Mock Exam1999

Name : Time : 1hour 30 minutes               
Class : Marks : /100

INSTRUCTIONS TO CANDIDATES

This paper consists of three sections.

You should write your answers to Questions 1 to 7 in the spaces provided.

Question 8(a) should be done in the isometric grid paper and Question 8(b) in the square grid paper.

You are advised to spend not more than

20 minutes on Section A

20 minutes on Section B

50 minutes on Section C.

This paper consists of 8 printed pages.


Section A (30 marks)

You are advised to spend not more than 20 minutes on this part.

Attempt all questions.

1. Name the following tools and state their uses:

wpe2.jpg (1627 bytes) Name of tool :auger bit
Uses : used with a ratchet brace for cutting large holes in wood.
wpe1.jpg (2647 bytes) Name of tool : curved snips
Uses : used for cutting internal curved edges on sheet metals.
wpe5.jpg (3805 bytes) Name of tool : protractor
Uses: Used with a scriber to marks lines that are at an angle to the datum edge of a metal workpiece or to text the angle of a bevel in a workpiece.
wpe6.jpg (1714 bytes) Name of tool :  rasp
Uses: Use to shape wood.  

2. Fill in the blanks with suitable words.

a.In plain sawing, the log is cut into planks by parallel saw cuts.
b. Stainless steel is hard, tough and non-toxic.
c. Urea formaldehyde resin is a translucent plastics.
e. GRP is commonly referred to as fibreglass.
f. Lead is resistant to corrosion.

3. Suggest a suitable material for making each of the following products: (6 marks)

e.g. raffia                                                polypropylene

a. garden bench                                      chengal (1)

b. air conditioning duct                            zinc (1)

c. soft solder                                           lead(1)

d. cooking pot                                        stainless steel (1)

e .sculpture                                             bronze (1)

f. barrel bolt                                            brass (1)

4. Answer the following questions in complete sentences.

a. List two advantages and two disadvantages of plastics.

Advantages : ability to be coloured,ability to take complex shapes,ability to be softened with heat,withstand shock,flexibility or corrosion resistance.

Disadvantages : it is not as strong as metals and most plastics do not have a very high resistance to heat.

b. Suggest some suitable materials for making templates. Why are they suitable?
Acrylic. It can be easily sawn to make a template.
Mild steel. Suitable for dovetail templates because it can be easily bent.

c. Name the tool that is used test the angle of a bevel.
Protractor

d. Give an advantage of knock-down furniture.
It can be assembled and taken apart without weakening the material or the joint.

e. Why is a pair of plastics gloves not suitable for working with hot acrylic.
The plastic gloves will be stuck to the acrylic.

f. Explain why it is sometimes necessary to heat up a metal workpiece before bending is carried out.

To soften the metal so that it will be easier to bend..


Section B (20 marks)

You are advised to spend not more than 20 minutes on this part.

Attempt all questions.

Answer the following questions in complete sentences

5. Describe how you would make an acrylic photo holder by filling in the blanks under the four steps given below:

Step 1 : Marking out - Describe how you would mark out on the acrylic.
Name the tools used.

Use a pencil, a steel rule and a try square to mark out the lines on the paper of the acrylic.

Step 2 : Cutting and Shaping - Describe how you would cut and shape the acrylic.
Name the tools used.

Use a coping saw to cut the acrylic into the required shape.

Use a second cut file to file the acrylic after sawing.

Keep filing until all marks on the acrylic have been removed.

Step 3 : Finishing - Describe how you would finish.

Use the smooth file to smoothen the acrylic.

Use abrasive paper with water to sane the acrylic.

Use the buffing machine with wax to polish the acrylic.

Step 4 : Thermoforming - Describe how you would thermoform and shape the acrylic.

Remove the protective paper of the acrylic.

Place the acrylic on the strip heater.

When the acrylic is pliable, remove it from the heater with a pair of gloves.

Use a rectangular block to bend one end of the acrylic.

Use a triangular block to bend the other end of the acrylic to an angle.

6. The steps in joining two metal parts are shown below.

Fill in the blanks to describe how the two metal parts are joined together. (10)

wpe7.jpg (2880 bytes) wpe8.jpg (2730 bytes)
1.Drill a hole through both pieces of metal.   4.Use the flat face of hammer to swell the end of the rivet.
wpe9.jpg (3448 bytes) wpeA.jpg (2562 bytes)
2. Cut rivet to correct length. 5.Use ball pein hammer to hsape the head of the rivet.
wpeB.jpg (3387 bytes) wpeC.jpg (3262 bytes)
3. Press the two parts together with a rivet set. 6. Form the rivet head using a rivet snap.


Section C (50 marks)

7. You have been asked to design a small wooden shoe box.
a. State two factors you would consider when designing the box.

Any two : safety, appearance, materials and cost.

b. What type of wood would you use to make the shoe box? (2)

Pine

c. Give one reason for your choice of wood. (2)

Easy to work with.

d. Suggest two types of joints you would use to assemble the parts. (4)

finger joint for the carcase and through housing joint for the shelf. (similar answers will also be accepted).

e. In the space provided, sketch a 3-dimensional view of the shoe box. (5)

Show clearly the joints that you have chosen.

8. The figure shows a geometrical solid.

a. Draw an isometric view of the solid on the isometric grid paper. (15 )

b. On the square grid paper, draw the Front Elevation, End Elevation and

Plan of the solid as viewed from the direction of the arrows. (20)

All dimensions are in millimetres. Do not dimension your drawings.

wpeD.jpg (5771 bytes)

 

 

END-OF-PAPER