2014 HL Section A short Q's

Question 1

identify two hazards associated with using adhesives on plastics

Answer 1

Creation of fumes from adhesives
bonding skin

chemical reaction of adhesive and plastic material

Question 2

Describe the advantages of upcycling the inner tubes of a bike to produce designer bags

Answer 2

Reduced production

valuable material not sent to landfill

Using an old product to make a new product

Question 3

outline two reasons for the use of tubular steel in the roof structure of modern sports arenas

Answer 3

greater strength to weight ratio

less material used

lighter structure weight

Question 4

one advantage and one disadvantage of using glass screens

Answer 4

advantage: Durable surface, widely available, transparent
disadvantage: brittle, heavier than alternatives, need to be thicker than plastics

Question 5

describe the importance of allotropy in carbon steel.

Answer 5

Allotropy modifies the solubility of carbon which allows some steels to be hardened

Question 6

differentiate between amorphous and crystalline structures

Answer 6

Amorphous structures are a random arrangement of atoms (e.g. glass)

Crystalline structures have atoms that are bonded together in a pattern that is repeated. E.g. metals with bcc and fcc unit cells

Question 7

Describe the contribution that any one of the following has made to technology
Jack Kilby, Marie Curie, John Dunlop

Answer 7

John Dunlop developed the pneumatic Tyre.

Question 8

Outline two reasons why research is important at the design stage of prosthetic devices

Answer 8

will show which products are already on the market

gives information about new materials and processes

will establish existing knowledge

Question 9

Describe 2 important properties of a material which is suitable for the manufacture of a prosthetic hand

Answer 9

lightweight

strong

non-corrosive

non-toxic

aesthetic

Question 10

discuss two advantages of pneumatics in industry

Answer 10

Clean

Strong and precise action

Can be programmed for a sequence of actions

Question 11

outline 2 reasons for using nylon in the steering column mounting

Answer 11

resistant to heat

can be machined

its not brittle

hardwearing

lubrication is not required

Question 12

What is allotropy

Answer 12

Allotropy is the ability of a material to exist in different forms