BECE 2014 BDT Pre-Technical Skills Paper 2 (Essay) – Answers

June 2014
BASIC DESIGN AND TECHNOLOGY 2
(Pre-Technical Skills 2)

Paper 2 – Essay

ANSWERS

SECTION A
(CORE SKILLS)

1. (a) State the main method for cooking the following foods:
(i) rice – boiling
(ii) cake – baking

(b) State four suitable methods for preserving fish.
 Drying
 Smoking
 Freezing
 Salting
 Frying
 Canning

(c) (i) List the type of pencil most suitable for the following operations:

(ii) List four methods of recording data for solving design problems.
 Taking notes / Using computer
 Taking photographs
 Video recording
 Audio recording
 Drawing / sketching
 Drawing graphs
 Making charts

(d) (i) State three benefits of packaging.
 It adds value to the product
 It protects the product from contamination
 It protects the consumer from hazards
 Attracts consumers
 Makes handling easier / makes it portable
 Promotes easy identification.

(ii) List two important information on a good package
 Information about content / manufacturer
 Date of production
 Expiry date
 Instructions for usage

(e) Draw a line to illustrate each of the following:

SECTION B
[50 marks] Answer two questions only from this section
All questions carry equal marks

2. Figure 1 shows a wooden object to be prepared in the workshop.

(a) Draw full size the front view in the direction of arrow W.

Accurately drawing 6 horizontal lines and 6 vertical lines neatly

(b) List two tools used for:

(i) marking-out the shape of the object
 Marking knife
 Pencil
 Try-square
 Marking gauge
 Rule / Tape measure
 Straight edge

(ii) cutting the waste wood.
• Mortise chisel or firmer chisel
• Mallet
• Tenon saw / other back saws (except rip saw)

(c) State two ways of caring for and maintaining the jack plane.
 Cleaning the tool after use
 Oiling the metal parts
 Keeping the tool in the rack or tool box
 Sharpening the tool before use

(d) State the difference between ferrous metals and non-ferrous metals.

 Ferrous metals are metals that contain iron while non-ferrous metals do not contain iron.
 Ferrous metals can rust while non-ferrous metals do not rust.

(e) Make a freehand sketch of the builder’s square.

3. (a) State one reason why personal safety should be observed in the workshop.
 To avoid injury
 To prevent accident

(b) List two specific tools for carrying out each of the following operations:
(i) setting-out a wall;
 Line and pins
 Straight edge
 Builder’s square
 Profile Boards
 Spirit Level
 Tape measure / surveyor’s tape
 Pegs
 Piece of chalk

(ii) moulding bricks;
 Mould box
 Head pan / gauge box / wheel barrow
 Shovel / spade
 Tamping rod
 Pick Axe

(iii) cutting a tenon from a piece of wood;
 Try square
 Marking gauge / mortise gauge
 Pencil / Marking knife
 Tenon Saw
 Mallet
 Bevel-edged chisel / firmer chisel

(iv) soldering sheet metals.
 Soldering iron / bit
 Coal pot / stove / blow lamp
 File / emery cloth
 Shears / pair of snips
 Mallet
 Folding bar

(c) (i) Make a freehand pictorial sketch of a rasp file

(ii) Label any two parts of the tool sketched in (c)(i) above.
 Blade / teeth / cut
 Tang
 Ferrule
 Handle
 Shoulder

(iii) State one use of the rasp file.
 For smoothening edges and shapes
 For shaping a circular piece of wood

(d) (i) State the main difference between a brick and a block.
 The size: A block is bigger than a brick
 The weight: A block is heavier than a brick
 The material: A block is made of concrete whilst brick is made of clay

(ii) List the two main materials for making sandcrete blocks.
 Sand
 Cement

4. (a) List one protective clothing each for the following:
(i) foot; safety boots / safety shoes / Protective shoes

(ii) head; Helmet

(iii) eyes, Goggles / eye shield / spectacles

(b) (i) Make a freehand pictorial sketch of the firmer chisel.

(ii) Label any two parts of the tool sketched in 4 (b) (i)
• Cutting edge
• Edge
• Ferrule
• Handle

(c) State one reason each for carrying out the following operations:
(i) cross-filing
 For removing waste metal
 For removing unwanted metal
 For removing excess metal

(ii) curing a sandcrete block;
 To help the block to attain its maximum strength
 To prevent rapid drying
 To reduce shrinkage
 To make it dense
 To prevent / reduce cracks
 To make it durable

(iii) setting out a wall.
• For straightness
• For squaring
• For accuracy

(d) Copy and complete the table below