This set of Casting, Forming and Welding Multiple Choice Questions & Answers (MCQs) focuses on “Radiography”.

1. On what voltage do the X-rays operate?
a) 350 kV
b) 375 kV
c) 400 kV
d) 475 kV

Explanation: The X-ray are waves are having very short wavelength. The object which has to be tested is exposed to the X-rays, for doing this, high voltage supply is required. The X-rays ideally operate on 400 kV.

2. X-rays are useful in detecting defects in casts up to what thickness?
a) 60 mm
b) 61 mm
c) 62 mm
d) 63 mm

Explanation: The X-rays are waves of high amount of energy in them and are very useful in the detection of defects in the casts. They need a high amount of voltage supply for this and are able to detect defects up to a thickness of 62mm.

3. What is the lower range of wavelength of the X-rays?
a) 0.001 x 10-5 cm
b) 0.001 x 10-6 cm
c) 0.001 x 10-7 cm
d) 0.001 x 10-8 cm

Explanation: X-rays are known to be waves with very low amount of wavelength. For the production of X-rays, one may usually need an X-ray tube. The shortest X-ray wavelength is calculated to be 0.001 x 10-8 cm.

4. What is the lower range of wavelength of the X-rays?
a) 40 x 10-7 cm
b) 40 x 10-8 cm
c) 40 x 10-9 cm
d) 40 x 10-10 cm

Explanation: The X-rays are considered to be rays having a short wavelength. These X-rays can be produced with the help of an X-ray tube or a Cobalt-60 isotope. The longest wavelength of an X-ray is 40 x 10-8 cm.

5. Which of the following is not a source of production for gamma rays?
a) Cobalt-60
b) Iridium-192
c) Caesium-167
d) Americium-241

Explanation: Among all the above given isotopes, a Cobalt – 60 isotope, Iridium-192 isotope and a Caesium-167 isotope are mainly used for producing gamma rays but not Americium-241 isotope, it is used for making alpha rays.
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6. What should the diameter of a Cobalt-60 source used for producing gamma rays?
a) 2 mm
b) 3 mm
c) 4 mm
d) 5 mm

Explanation: For the production of gamma rays, there are some radioactive particles employed. One of them is a Cobalt-60 isotope. The diameter of the source of this isotope is calculated to be around 3 mm in length.

7. For what thickness of a material, do the X-rays give the best results?
a) 50 mm
b) 55 mm
c) 60 mm
d) 65 mm

Explanation: X-rays are considered to be having a larger wavelength as compared to that of gamma rays. Owing to this fact, the penetration power of the X-rays is less. Hence, for a shorter thickness, it would give good detection. The best results are obtained in X-ray detection when the thickness of the material is below 50mm.

8. Which of the following can be a wavelength of gamma ray?
a) 2 x 10-8 cm
b) 3 x 10-8 cm
c) 4 x 10-8 cm
d) 5 x 10-8 cm

Explanation: Gamma rays are supposedly known to have a shorter wavelength as compared to that of X-rays. The wavelength of gamma rays ranges from 0.005 x 10-8 cm to 3 x 10-8 cm.

9. The film produced by an X-ray is called as a radiograph.
a) True
b) False

Explanation: The film produced by an X-ray is called as an exograph. The film that is produced using gamma rays is called as gamma graph and the combination of the two is called as a radiograph.

10. The penetration power of X-rays depends only on the wavelength of the radiation.
a) True
b) False

Explanation: In radiography, there is an X-ray wave used for non-destructive testing. The penetration power of the X-ray depends not just on the wavelength of the radiation but also on the absorbing power of the material.

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