DT A LEVEL REVISION EXAM SET OF QUESTIONS
AND CORRECT ANSWERS ALREADY GRADED A+
GUARANTEED SUCCESS
Vacuum forming
Process to heat a thermoplastic sheet until it softens and then force the hot and
pliable material against the contours of a mold using vacuum pressure.
Where are recycle symbols used?
they are usually used on plastic products/packaging
Why is the FSC logo used?
It is used on products to assure you that it is made with, or contains, forest-based
materials from FSC-certified forests
Why are recycle symbols used?
The number in the symbol tells the user what type of plastic is used. This makes it
easier to recycle
Thermoplastic
A material that can be repeatedly reheated and reshaped, allowing it to be recycled
after initial use.
Hardening
heat metal and cooled rapidly by quenching
Tempering
done after hardening to regain toughness + ductility. Heated (lower temp.) and
quenched. Hardness reduced but remains hard.
Blow Moulding
process for making hollow plastic forms by blowing air into heated thermoplastic
using a mould
Advantages of man-made boards
, - gets rid of knots
- no warping and splitting
- uniform
- able to use recycled materials
- available in large and flat sheets (2440x1220mm)
What is this logo?
FSC logo (Forest Stewardship Council)
Examples of composites
fibreglass (GRP), carbon fibre (CFRP), concrete, wood
Advantages of companies selling refill packs for laundry detergents
- environmentally friendly
- less plastic
Disadvantages of companies selling refill packs for laundry detergents
Common characteristics of polymers
1. Self-texturing
2. Self-finishing
3. Self-colouring
4. Good thermal and electrical insulator
5. Good chemical resistance
Tensile strength
the ability to withstand tension without breaking
Hardness
the ability of a mineral to resist scratching
Toughness
Ability to resist impact without breaking
AND CORRECT ANSWERS ALREADY GRADED A+
GUARANTEED SUCCESS
Vacuum forming
Process to heat a thermoplastic sheet until it softens and then force the hot and
pliable material against the contours of a mold using vacuum pressure.
Where are recycle symbols used?
they are usually used on plastic products/packaging
Why is the FSC logo used?
It is used on products to assure you that it is made with, or contains, forest-based
materials from FSC-certified forests
Why are recycle symbols used?
The number in the symbol tells the user what type of plastic is used. This makes it
easier to recycle
Thermoplastic
A material that can be repeatedly reheated and reshaped, allowing it to be recycled
after initial use.
Hardening
heat metal and cooled rapidly by quenching
Tempering
done after hardening to regain toughness + ductility. Heated (lower temp.) and
quenched. Hardness reduced but remains hard.
Blow Moulding
process for making hollow plastic forms by blowing air into heated thermoplastic
using a mould
Advantages of man-made boards
, - gets rid of knots
- no warping and splitting
- uniform
- able to use recycled materials
- available in large and flat sheets (2440x1220mm)
What is this logo?
FSC logo (Forest Stewardship Council)
Examples of composites
fibreglass (GRP), carbon fibre (CFRP), concrete, wood
Advantages of companies selling refill packs for laundry detergents
- environmentally friendly
- less plastic
Disadvantages of companies selling refill packs for laundry detergents
Common characteristics of polymers
1. Self-texturing
2. Self-finishing
3. Self-colouring
4. Good thermal and electrical insulator
5. Good chemical resistance
Tensile strength
the ability to withstand tension without breaking
Hardness
the ability of a mineral to resist scratching
Toughness
Ability to resist impact without breaking
