Question: The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?

• 1. Marcaptan group
• 2. Hydroxyl group
• 3. Silane group
• 4. Virryl group

Question: Hysteresis in a hydrocolloid gel is______________?

• 1. Moisture absorption
• 2. Temperature lag between gelation and liquefaction temperature
• 3. Phenomenon of conversion of gel into sol
• 4. All of the above

Question: All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?

• 1. Adding a small amount of glycerine
• 2. Adding a small amount of water
• 3. Altering the amounts of the two pastes used
• 4. Cooling mixing slab

Question: All of the following statements about Type II silicon impression material are true EXCEPT_______________?

• 1. They evolve hydrogen when cast if they are not fully cured
• 2. They exhibit a very low setting shrinkage
• 3. They have a lower tear resistance than polysulphide rubbers
• 4. They set by condensation polymerisation

Question: The Zinc oxide-eugenol impression pastes harden by________________?

• 1. Chemical reaction
• 2. Cold
• 3. Heat
• 4. Pressure

Question: The greatest stress which may be produced in a material such that stress is directly proportional to the strain is know as_____________?

• 1. The elastic limit
• 2. The proportional limit
• 3. The yield strength
• 4. Modulus of elasticity

Question: The modulus of elasticity is defined as_______________?

• 1. The stress at the proportional limit
• 2. The strain at the proportional limit
• 3. The stress/strain ratio within the proportional limit
• 4. None of the above

Question: Strain is defined as_____________?

• 1. An applied load or force
• 2. A deformation resulting from an applied load
• 3. An external force opposing an applied load
• 4. An internal force opposing an applied load

Question: A good adhesive should possess all of the following EXCEPT________________?

• 1. High adherend wetting
• 2. High contact angle
• 3. Low contact angle
• 4. High flow

Question: In measuring Vickers hardness no. Which of the following is used________________?

• 1. Spherical indenter
• 2. Steel ball indentation
• 3. Rhomboid shaped indenter
• 4. 136-degree diamond pyramid