2017 HL Section A short q's

Question 1

outline two advantages of LED car headlights over traditional car headlights

Answer 1

they take up less energy

they’re brighter

Question 2

identify two metals commonly used to protect steel from corrosion

Answer 2

Zinc, tin, copper, chromium, gold, silver

Question 3

outline two safety devices integrated into modern motor vehicles

Answer 3

airbags, traction control, impact resistant windscreen,

Question 4

the cardboard ecohelmet was awarded the 2016 international james dyson award. Outline 2 advantages of this design

Answer 4

lightweight, ergonomic design

Question 5

give two reasons why stainless steel is suitable for the manufacture of surgical devices

Answer 5

non-toxic, tough, does not contaminate

Question 6

Discuss the contribution that any one of the following has made to technology
(i)george devol (ii)marie curie (iii) Dugald Clarke

Answer 6

(ii) Marie curie discovered polonium and radium

Question 7

wireless technologies such as wifi and bluethooth are widely used. Give one advantage and one disadvantage

Answer 7

advantage: no physical connection required
disadvantage: concern over security for sensitive information

Question 8

describe two benefits of using carbon fiber (graphite) shafts over steel shafts

Answer 8

A graphite shaft will not rust
will be more flexible
A lighter club can be swung faster
graphite has a softer, damper feel

Question 9

Explain the term fatigue failure

Answer 9

Metal fatigue is failure due to on/off loading or cyclic stressing. Starts off as a small crack that grows under stress

Question 10

explain the difference between a gap gauge and a plug gauge

Answer 10

gap gauge is used to determine the limits of a round bar.

plug gauge is used to test the dimensions of holes.

Question 11

describe the principal of operation of a double acting hydraulic ram.

Answer 11

A double-acting hydraulic ram has a port at each end, supplied with hydraulic fluid for both the
retraction and extension of the piston. It is used where high force is required in both directions of
travel.

Question 12

the first flight around the world without using fossil fuel, was completed in july 2016 by the solar impulse 2. Describe briefly how this could be achieved

Answer 12

it used improved motors and a large number of solar cells.