X-ray Films l Oral radiology MCQs for dental students

X-ray Films, Intensifying Screen and Cassette l Oral radiology 4th year MCQs for dental students 

MCQ on x-ray film for dental radiology

Type of film which is used in combination with intensifying screen is

a. Occlusal film

b. Periapical film

c. Extraoral film

d. Bitewing film

Single emulsion films are used in

a. Periapical radiography

b. Duplicating film

c. Bitewing radiography

d. Occlusal radiography

Lesser exposure time is required in which type of films?

a. Slow-speed film

b. Fast-speed film

c. Both a and b

d. Extraoral films

C-speed film is a type of

a. Slow-speed film

b. Fast-speed film

c. Hyperspeed G

d. None of the above

Dimensions of size 2 film are

a. 24 × 40 mm

b. 31 × 41 mm

c. 57 × 76 mm

d. 22 × 35 mm

Lead foil is used in X-ray film packet in order to

a. Protect the film from light

b. Prevent contamination from saliva

c. Prevent scattered radiation

d. All of the above

Polyester is preferred as a base because it is

a. More resistant to wrapping with age

b. Stronger than triacetate

c. Non-inflammable as compared to cellulose nitrate base

d. All of the above

Ideal thickness of base used in X-ray film is

a. 0.5 mm

b. 0.2 mm

c. 1.0 mm

d. 0.7 mm

Emulsion in X-ray film is sensitive to

a. X-rays

b. Static electricity

c. Visible light

d. All of the above

Average diameter of silver grains in emulsion is about

a. 0.7–0.75 mm

b. 0.5–1.0 mm

c. 2.0–2.5 mm

d. 1.0–1.5 mm

Which constituent is added to emulsion in order to increase sensitivity?

a. Silver iodide

b. Gold

c. Sulphur

d. Both a and b

The factor which affects film speed is

a. Size of crystal

b. Shape of grains

c. Thickness of emulsion

d. All of the above

Average size of a film used in panoramic radiography is

a. 5 × 7 in.

b. 6 × 12 in.

c. 8 × 10 in.

d. 10 × 12 in

Total thickness of intensifying screen is about

a. 380 mm

b. 430 mm

c. 250 mm

d. 450 mm

Advantages of intensifying film include

a. Reduced patient dose

b. Less development time of film

c. More sensitivity to film

d. All of the above

Ideal thickness of phosphorus layer in intensifying screen is about

a. 40–100 um

b. 50–60 um

c. 100–120 um

d. 40–60 um

Type of film-holding device used in patients with hypersensitive gag reflex is

a. Haemostat

b. Bite-blocks

c. Rinn Snap-A-Ray film holder

d. Rinn XCP instrument

Type of cassette used in panoramic radiography is

a. Rigid cassette

b. Flexible cassette

c. Gridded cassette

d. Both a and b

Phosphor material used in intensifying screen is

a. Calcium tungstate

b. Titanium dioxide

c. Gadolinium and lanthanum

d. Both a and c

Most common type of intensifying screen film used in panoramic and cephalometric radiography is

a. Ultraviolet light

b. Green light

c. Blue light

d. Red light