Self Assessment Questions

Question 1

Comparing X and gamma rays at the same wavelength in the electromagnetic spectrum:

A- X rays are more penetrating than gamma
B- gamma rays are more oenetrating than X rays
C- penetration is the same
D- penetration is not related to the wavelength

Answer 1

C- penetration is the same

Question 2

Compared with X rays or Gamma rays! Light :

A-has longer wavelength and higher frequency
B- has longer wavelength and lower frequency
C- travels faster
D-has shorter wavelength and lower frequency.

Answer 2

B- has longer wavelength and lower frequency

Question 3

An electron :-

A- Carries an electric charge that is equal and opposite to that of a proton
B- is approx 1836 times heavier than a neutron
C - is called an alpha particle when travelling at very high velocity
D - a b and c are correct

Answer 3

A- carries an electric charge that is equal and opposite to that of a proton

Question 4

The 3 properties of the radiation used for NDE radiography are

A- fluorescence , ionisation , penetration
B-Penetration, Chemical effect , flourecence .
C-penetration, chemical effect , travels in straight lines
D-chemical effect, ionisation , travels in straight lines .

Answer 4

C-penetration , chemical effect, travels in straight lines .

Question 5

An ion is :

A- an atom that has fewer neutrons than protons
B- an atom that has more neutrons than protons
C-either a or b
D-An atom that has a number of electrons that is unequal to the number of protons in the nucleus

Answer 5

D- An atom that has a number of electrons that is unequal to the number of protons in the nucleus

Question 6

The nucleus of any atom other than hydrogen contains :

A-protons and electrons
B- protons and , neutrons and electrons
C- neutrons and protons
D- alpha beta and gamma particles

Answer 6

C - neutrons and protons

Question 7

In X radiography , radiation intensity is proportional to

A-tube voltage
B-filament current
C-tube current
D-the square of the focus to film distance

Answer 7

C- Tube current

Question 8

The penetrating power of X-rays is controlled by :

A: Tube current
B: Tube Voltage
C- ( tube current ) X ( tube voltage )
D- both (a) and ( B)

Answer 8

B - tube voltage

Question 9

X Ray equipment may have a self rectified or a greinacher circuit arrangement . The main advantage of equipment that uses a greinacher circuit is :

A- better Radiographic sensitivity at the same tube voltage
B - Shorter exposure time at the same tube voltage and tube current
C- the focus size is generally much smaller .
D- The greinacher circuit is ideal for on site radiography .

Answer 9

B - shorter exposure time at the same tube voltage and tube current .