Structure of matter

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Structure of matter

Dental material

1- used as permanent filling material .

1 point

a) Cements

b) Amalgam

c) Dental waxes

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2- used as intermediate filling material.

1 point

a) Cements

b) Composite

c) Dental waxes

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3- bond have large difference in electronic negativity

1 point

a) Ionic Bond

b) Covalent bond

c) Hydrogen Bond

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4- In Dentistry Ionic Bond is found in

1 point

a) phosphate cement

b) gypsum investment

c) Both

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5- In Dentistry monomer molecule in dental resin held by …… bonds within polymer chain .

1 point

a) covalent bond

b) hydrogen bond

c) metallic

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6- Opacity and lustrous is properties especially for

1 point

a) Metallic Bond

b) Ionic Bond

c) Hydrogen Bond

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7- Absorption of water by synthetic resin is an example for ....... Bond

1 point

a) covalent

b) Hydrogen.

c) Vander Waal

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8- Fluctuating dipoles of asymmetrical molecule is prop of ..... bond.

1 point

a) Vander Waal

b) Hydrogen

c) Covalent

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9- Chemisorptions of gases by alloy liquid is followed by attraction due to

1 point

a) Vander Waal force

b) electrostatic force

c) Ionic Force

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10- Metallic Bond is …. than covalent and Ionic Bond

1 point

a) weaker

b) stronger

c) intermediate

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11- The 14 different ways to arrange lattice in space are called

1 point

a) space lattice

b) point lattice

c) bravais lattice

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12- To have a solid solution metal should have the same ...........

1 point

a) lattice structure

b) mechanical prop

c) allotropic prop

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13- is responsible for definite melting point of the material

1 point

a) crystalline structure

b) amorphous

c) metallic

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14- The average biting force with the natural teeth is about

1 point

a) 755 N.

b) 577 N

c) 575 N

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15- ISO is

1 point

A)Federation Dentaire Internationale

B) International Standard Organization

C) American Dental Association

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16- Electrical and thermal insulators, Insoluble in water Very strong, highly directional, these are properties of:

1 point

a) Ionic bond

b) Vander waal force

c) Covalent bond

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17- Crystalline material :

1 point

a) Have melting range

b) Have glass transition temperature

c) Have definite melting point

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