Dental Material Properties Quiz! Trivia
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Questions and Answers
- 1.
Objects that appear to be color-matched under one type of light may appear different under another light source. This phenomenon is called as
- A.
Incandescence
- B.
Florescence
- C.
Metamerism
- D.
Mesmerism
Correct Answer
A. Incandescence -
- 2.
Which of the following are micro hardness tests?
- A.
Knoop and Vickers
- B.
Vickers and Rockwell
- C.
Rockwell and Knoop
- D.
Rockwell and Brinell
Correct Answer
C. Rockwell and KnoopExplanation
The correct answer is Rockwell and Knoop. Micro hardness tests are used to measure the hardness of materials at a small scale. The Rockwell test measures the depth of penetration of an indenter, while the Knoop test measures the indentation hardness using a diamond indenter. Both tests are commonly used to determine the hardness of materials in various industries.Rate this question:
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- 3.
The time-dependent Plastic deformation of a material is called as:
- A.
Creep
- B.
Viscosity
- C.
Flow
- D.
Elasticity
Correct Answer
A. CreepExplanation
Creep refers to the time-dependent plastic deformation of a material. It occurs under a constant load or stress over an extended period, causing the material to slowly deform and change shape. This phenomenon is commonly observed in materials subjected to high temperatures and constant stress, such as in the aerospace and power generation industries. Creep is different from elasticity, which refers to the material's ability to return to its original shape after the load or stress is removed. Viscosity and flow are properties related to the fluid behavior of materials, not specifically associated with time-dependent plastic deformation.Rate this question:
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- 4.
Which of the following atomic bonds are characterized by physical forces?
- A.
Ionic
- B.
Vander waal Forces
- C.
Metallic
- D.
Covalent
Correct Answer
B. Vander waal ForcesExplanation
Vander Waal forces are characterized by physical forces. These forces are weak attractive forces that occur between molecules or atoms due to temporary fluctuations in electron distribution. Unlike covalent or metallic bonds, Vander Waal forces do not involve the sharing or transfer of electrons. Instead, they arise from the temporary imbalances in electron distribution, creating regions of partial positive and negative charges. These forces are responsible for interactions between nonpolar molecules and play a significant role in determining the physical properties of substances such as boiling and melting points.Rate this question:
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- 5.
The temperature at which a solid changes into liquid is called as:
- A.
Temperature of vaporization
- B.
Fusion temperature
- C.
Specific temperature
- D.
Latent heat
Correct Answer
B. Fusion temperatureExplanation
The correct answer is "Fusion temperature." Fusion temperature refers to the specific temperature at which a solid substance changes into a liquid state. It is the point at which the solid's particles gain enough energy to overcome the forces holding them in a fixed position, resulting in the transition to a liquid phase. This process is also known as melting.Rate this question:
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- 6.
The modulus of elasticity is defined as:
- A.
Stress at proportional limit
- B.
Strain at proportional limit
- C.
Stress-Strain ration within the proportional limit
- D.
None of the above
Correct Answer
C. Stress-Strain ration within the proportional limitExplanation
The modulus of elasticity is a measure of a material's stiffness or ability to deform under stress. It is defined as the stress-strain ratio within the proportional limit. The proportional limit is the point at which the material's behavior is linearly elastic, meaning that the stress and strain are directly proportional to each other. Therefore, the correct answer is "Stress-Strain ratio within the proportional limit."Rate this question:
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- 7.
Ability of an orthodontic wire to spring back to its original shape is evaluated by:
- A.
Brittleness
- B.
Resilience
- C.
Tensile strength
- D.
Toughness
Correct Answer
B. ResilienceExplanation
The ability of an orthodontic wire to spring back to its original shape is evaluated by resilience. Resilience refers to the ability of a material to absorb energy when deformed and then release that energy when the force is removed, allowing it to return to its original shape. In the context of an orthodontic wire, resilience is important as it allows the wire to exert a continuous and consistent force on the teeth, aiding in the alignment process.Rate this question:
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- 8.
If the viscosity of the material decreases with increase in the shear rate, it is said to exhibit:
- A.
Newtonian Behavior
- B.
Dilatant Behavior
- C.
Pseudoplatic Behavior
- D.
Thixotropic Behavior
Correct Answer
C. Pseudoplatic BehaviorExplanation
Pseudoplastic behavior refers to the property of a material where its viscosity decreases with an increase in the shear rate. This means that as the material is subjected to higher rates of deformation or shear, it becomes less viscous and flows more easily. This behavior is commonly observed in certain types of fluids, such as polymer solutions or suspensions, where the viscosity decreases due to the alignment and orientation of the particles or molecules under shear stress.Rate this question:
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- 9.
The lightness or darkness irrespective of color is called as:
- A.
Hue
- B.
Value
- C.
Chroma
- D.
Fluoroscence
Correct Answer
B. ValueExplanation
Value refers to the lightness or darkness of a color, regardless of its specific hue or chroma. It represents the amount of light reflected by a color, with lighter values indicating more light and darker values indicating less light. Value is an important aspect of color theory as it helps create contrast and depth in artwork and design.Rate this question:
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- 10.
Hardness test to measure hardness of rubbers and soft plastics is:
- A.
Knoop Hardness
- B.
Vickers Hardness
- C.
Shore A Scleroscope Hardness
- D.
Rockwell Hardness
Correct Answer
C. Shore A Scleroscope HardnessExplanation
Shore A Scleroscope Hardness is the correct answer for measuring the hardness of rubbers and soft plastics. This test involves using a device called a scleroscope to measure the rebound height of a diamond-tipped hammer dropped onto the material's surface. The hardness value is determined based on the rebound height, with higher values indicating greater hardness. This method is specifically designed for soft materials and provides a reliable measure of their hardness. Knoop Hardness and Vickers Hardness are more suitable for harder materials, while Rockwell Hardness is commonly used for a wide range of materials but may not be as accurate for rubbers and soft plastics.Rate this question:
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- 11.
Stress of the object is:
- A.
External force per unit area
- B.
Internal force per unit area
- C.
Force per unit area
- D.
Change in length per unit area
Correct Answer
B. Internal force per unit areaExplanation
The stress of an object refers to the internal force per unit area that the object experiences. This means that stress is the result of the forces that are present within the object itself, rather than any external forces acting upon it. Stress is commonly measured in units such as pascals (Pa) and is an important concept in materials science and engineering, as it helps to determine how materials will behave under different loads and conditions.Rate this question:
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- 12.
The maximum strain seen in the object up to its proportional limit is called as:
- A.
Resilience
- B.
Flexibility
- C.
Toughness
- D.
hardness
Correct Answer
B. FlexibilityExplanation
Flexibility refers to the ability of an object to bend or deform without breaking. The maximum strain experienced by an object up to its proportional limit is a measure of its flexibility. Resilience is the ability of an object to absorb and store energy when deformed elastically. Toughness is the ability of an object to absorb energy and deform plastically before breaking. Hardness refers to the resistance of an object to indentation or scratching. Therefore, flexibility is the most appropriate term to describe the maximum strain seen in an object up to its proportional limit.Rate this question:
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- 13.
When solid gets wet completely, the contact angle made by the liquid over solid will be:
- A.
90 degrees
- B.
Zero degrees
- C.
More than 90 degrees
- D.
50 degrees
Correct Answer
B. Zero degreesExplanation
When a solid gets wet completely, the contact angle made by the liquid over the solid will be zero degrees. This means that the liquid will spread evenly over the surface of the solid, indicating a high level of wetting. A contact angle of zero degrees suggests that the liquid has a strong affinity for the solid surface, resulting in complete wetting.Rate this question:
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- 14.
Sublimation is the conversion of:
- A.
Solid directly to gas
- B.
Gas to liquid and then to solid
- C.
Gas directly to liquid
- D.
Solid to liquid and then to gas
Correct Answer
A. Solid directly to gasExplanation
Sublimation is the process in which a solid substance directly converts into a gas without going through the liquid phase. This occurs when the temperature and pressure conditions allow the solid particles to gain enough energy to break their intermolecular bonds and escape into the gas phase. Examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (solid naphthalene).Rate this question:
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- 15.
The shaded area 'A' in this image is
- A.
Resilience
- B.
Toughness
- C.
Hardness
- D.
Flexibilty
Correct Answer
A. ResilienceExplanation
Resilience is the ability of a material to absorb energy when it is deformed elastically and then release that energy upon unloading. In the given image, the shaded area 'A' represents the material's ability to withstand and recover from deformation without permanent damage. This indicates that the material possesses resilience, as it can absorb and dissipate energy without breaking or undergoing permanent deformation.Rate this question:
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- 16.
The amount of heat that flows per unit time through a unit area with a temperature gradient of one degree per unit distance is called as:
- A.
Thermal diffusivity
- B.
Thermal conductivity
- C.
Coefficient of thermal expansion
- D.
Thermal contraction
Correct Answer
B. Thermal conductivityExplanation
Thermal conductivity refers to the amount of heat that flows per unit time through a unit area with a temperature gradient of one degree per unit distance. It is a measure of how well a material conducts heat and is typically represented by the symbol "k". Higher thermal conductivity values indicate that a material is a better conductor of heat, while lower values indicate poorer heat conduction.Rate this question:
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- 17.
Impact strength is tested by:
- A.
Gillmore tester
- B.
Vicat tester
- C.
Izod tester
- D.
Penetrometer
Correct Answer
C. Izod testerExplanation
The Izod tester is used to test the impact strength of a material. It measures the energy required to fracture a notched specimen under a high-speed pendulum impact. This test is commonly used for brittle materials such as plastics and ceramics. The Izod tester provides valuable information about the material's ability to withstand sudden impacts and is widely used in quality control and material selection processes.Rate this question:
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- 18.
The ability of the material to withstand tensile load without fracture when it is stressed to its proportional limit is called as:
- A.
Malleablity
- B.
Flexibility
- C.
Ductility
- D.
Resilience
Correct Answer
C. DuctilityExplanation
Ductility refers to the ability of a material to withstand tensile load without fracturing when it is stressed to its proportional limit. This means that the material can be stretched or pulled without breaking. Malleability refers to the ability of a material to be hammered or rolled into thin sheets without breaking, while flexibility refers to the ability of a material to bend or deform under stress. Resilience refers to the ability of a material to absorb energy and return to its original shape after being deformed. Therefore, the correct answer is ductility.Rate this question:
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- 19.
An object is said to have color if it posses the characteristics of:
- A.
Scattering and Absorption
- B.
Saturation and Translusency
- C.
Opalescent and Satruration
- D.
Opalescent and Translusency
Correct Answer
A. Scattering and AbsorptionExplanation
An object is said to have color if it possesses the characteristics of scattering and absorption. Scattering refers to the phenomenon where light rays are dispersed or redirected in different directions when they interact with the object. Absorption, on the other hand, refers to the process where the object absorbs certain wavelengths of light and reflects others, resulting in the perception of color. Together, scattering and absorption play a crucial role in determining the color of an object.Rate this question:
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- 20.
Most materials have Poisson's ratio values ranging between:
- A.
2 and 4
- B.
-1.5 and 0.5
- C.
0.0 and 0.5
- D.
1 and 2
Correct Answer
C. 0.0 and 0.5Explanation
The correct answer is 0.0 and 0.5. Poisson's ratio is a measure of the deformation that occurs in a material when it is subjected to an external force. It is defined as the ratio of lateral strain to axial strain. Most materials have Poisson's ratio values between 0.0 and 0.5, indicating that they are able to compress in one direction while expanding in the perpendicular direction. Values outside of this range would indicate unusual behavior, such as negative Poisson's ratios or extreme stiffness.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Jul 31, 2017Quiz Created by
Dr Jayashree
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