1. Fibre optic systems work on which of the following principles?

Refelction

Diffraction

Refraction

Reticulation2. Which part of the retina contains no rods or cones?

Fovea centrails

Iris

Blind spot

Optic nerve3. Hypermetropia is otherwise known as?

Short sight

Long sight

Normal sight

Magnification sight4. As the wavelength of electromagnetic radiation increases the frequency will?

Stay the same

Decrease

Increase

Either decrease or increase5. Resolution is the ability to see which of the following?

The smallest flaw possible

Two flaws adjacent to each other as one

Two flaws adjacent to each other as seperate flaws

A large flaw at a distance of over 3 metres6. Which colour within the visible spectrum has the shortest wavelength?

Orange

Red

Blue

Violet7. What function do the ciliary muscles carry out?

Open and close the pupil

Stop harmful radiation entering the eye

Accomodate the size and thickness of the lens

Focus the light rays on the retina8. To what wavelength of radiation is the human eye most sensitive?

320 nM

5750 Angstroms

4200 Angstroms

400 nM9. What is the minimum angle in relation to the test surface that visual examination can be carried out at?

60 degrees

90 degrees

0 degrees

30 degrees10. How often should a visual inspectors eyes be checked for near vision?

Daily

Annually

Every six months

Only initially11. Under darkened - scotopicvision - conditions which receptors within the retina are sensitive?

Cones

Rods

Bothe cones and rods

None of the above12. Direct visual examinations may be carried out using which of the following?

Boroscope

Mirrors

Fibroscope

All of the above

None of the above13. Stereoscopic vision is limited to magnification factors less than when using singular magnification lenses?

None

X2

X5

X10

14. Which of the following weld defects would be visually detectable on a completed weld?

Lack of interun fusion

Sub surface porosity

Lack of side wall fusion

Undercut15. A measured amount of undercut is detected that is allowable when refernced to an acceptable criteria. The uundercut is therefore decribed as?

A defect

An indication

A flaw

None of the above

Here are the corrections:

1. Refelction2. Blind spot3. Long sight4. Decrease5. Two flaws adjacent to each other as seperate flaws6. Violet7. Accomodate the size and thickness of the lens8. 5750 Angstroms9. 30 degrees10. Annually11. Rods12. All of the above13. X214. Undercut15. A flaw