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NEET MDS Quiz - Practice Test
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Practice Test

All Subjects - 3 Questions

1
Endodontics
Angle of the tip of an endodontic instrument according to ISO specifications is:

1) 75 + 15
2) 75 15
3) 80
4) None of the above

📝 Explanation:

The International Organization for Standardization (ISO) has standardized the design of endodontic instruments (files and reamers).

One of the critical parameters is the tip angle, which determines how the instrument engages dentin and initiates cutting.

The tip angle is specified as 75 15, meaning it can range from 60 to 90 depending on the instrument type and manufacturer.

This standardization ensures uniformity, predictable cutting efficiency, and safety during root canal preparation.

2
Oral Surgery
When mandibular teeth are to be extracted, the patient should be positioned in such a way that the occlusal plane of the mandibular arch is
1) Parallel to the floor when the teeth are closed together
2) Parallel to the floor when the mouth is wide open
3) Perpendicular to the floor when the teeth are closed together
4) Perpendicular to the floor when the mouth is wide open

📝 Explanation:

For mandibular tooth extraction, the occlusal plane should be parallel to the floor when the mouth is wide open. This positioning provides optimal access, proper force direction, and ergonomic advantage for the operator during mandibular extractions.

3
Radiology
The cathode in Coolidge tube is made of..............whereas anode is made of............... 
 1. Copper; copper
 2. Molybdenum; copper
 3. Iron; lead
 4. Aluminium; iron

📝 Explanation:

The cathode in a Coolidge tube is made of molybdenum, whereas the anode is made of copper.

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