Design and Technology Mid Year

2014 4N Mid-year exam answer scheme

Part A

1a) Any two modifications:

Strength [1]:

Change the material of the metal seat (including the legs) to carbon steel or material with better strength.

Add reinforcement (such as braces to the legs) so that the legs will not buckle under heavy weight.

Stability [1]:

Re-design the seat so that there are four legs instead of three legs.  

Re-design the three legs to be further apart to lower the centre of gravity

Re-design so that there is a solid base (instead of legs) to lower the centre of gravity.

1b) Anthropometry is concerned with the size and proportions of the human body. [1]

1c) Appropriate sketch [1]

[pic 1]

Height of seat (length of lower leg) [1]

Depth of seat (length of thigh) [1]

Width of seat (buttock size) [1]

1d) Ergonomics features: Any three [3]

Padded or cushion seat

Back rest

Leg rest

Arm support/rest

2 a) Any two design specifications relating to the following [2]:

Stability of stand when in use

Adjustable angle so that the music score can be seen at a comfortable angle

Foldable/Retractable so that it can made compact and stored in a school bag when not in use

Lightweight material for ease of carrying in a school bag

2 b) Any two reasonable needs [4]

Physical: NA

Intellectual: Learning to play difficult music to challenge oneself

Emotional: Playing music that affects one’s emotions

Social: Playing to an audience or among other music players

2c) Any two [2]

Product that allows easy and quick disassembly to facilitate recycle-ability

Choice of materials in the product that is recycle-able.

3a) Joint edges (which are formed using chloroform) are weaker compared to a bent edge. [1]

3b) [3]

P: It is very easy and fast to make due to its simple design

M: It can topple easily if too many letters are placed on it.

I  : It reminds me of the letter L, when viewed from the left side of the letter holder.

3c)

State one of the SCAMPER technique [1]

Drawing of the improved letter holder [2] using the technique.

4a) Any two of the following [2]:

Oblique

Isometric

Exploded

Perspective

4b) Orthographics projection drawing [1]

Part B

5. a)

i) Honeycomb structure [1]

ii) Lightweight but strong against compression force [1]