Space lattice refers to:

 # Space lattice refers to:

A. Inter atomic movement

B. Inter atomic imbalance

C. Arrangement of atoms

D. Arrangement of molecules

The correct answer is C. Arrangement of atoms.

A space lattice can be defined as any arrangement of atoms in space in which every atom is situated similarly to every other atom.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 20

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Which of the following bonds is responsible for thermal conduction?

 # Which of the following bonds is responsible for thermal conduction?

A. Ionic bond

B. Van der Waal bond

C. Metallic bond

D. Covalent bond

The correct answer is C. Metallic bond.

The free electrons give the metal its characteristically high thermal and electrical conductivity. These electrons absorb light energy, so that all metals are opaque to transmitted light. The metallic bonds are also responsible for the ability of metals to deform plastically. The free electrons can move through the lattice, whereas their plastic deformability is associated with slip along crystal planes. During slip deformation, electrons easily regroup to retain the cohesive nature of the metal.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 19

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Atomic bonds characterized by physical forces

 # Which of the following atomic bonds are characterized by physical forces?

A. Ionic bonds

B. Van der Waal bonds

C. Metallic bonds

D. Covalent bonds

The correct answer is B. van der Waals bonds

van der Waals forces—Short-range force of physical attraction that promotes adhesion between

molecules of liquids or molecular crystals.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 17

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AIIMS MDS ENTRANCE EXAM MCQs - 2012 MAY

 

# Component from second branchial arch is:
A. Mandible
B. Muscles of mastication
C. Muscles of facial expression
D. TMJ

# Sensory nerve supply of TMJ is:
A. Masseteric nerve
B. Auriculotemporal nerve
C. Buccal nerve
D. Facial nerve

# Which blood vessel does not supply pharyngotympanic tube?
A. Ascending pharyngeal
B. Ascending palatine
C. Middle meningeal
D. Artery of pterygoid canal