In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ?

Related Mcqs:

1. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same___________________?

   A. Period increases
   B. Period decreases
   C. Group increases
   D. Both ‘B’ & ‘C’

2. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?

   A. AB3
   B. A2B3
   C. A2B
   D. AB2

3. “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

   A. Raoult’s
   B. Henry’s
   C. Amagat’s
   D. None of these

4. At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?

   A. Eutectic
   B. Triple
   C. Plait
   D. Critical

5. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?

   A. Freezing
   B. Triple
   C. Boiling
   D. Boyle

6. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?

   A. Temperature only
   B. Temperature and pressure only
   C. Temperature, pressure and liquid composition xi only
   D. Temperature, pressure, liquid composition xi and vapour composition yi

7. The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?

   A. Contracts
   B. Expands
   C. Does not change in volume
   D. Either (A), B. or (C)

8. A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?

   A. Sub-cooled
   B. Saturated
   C. Non-solidifiable
   D. None of these

9. Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

   A. Mixing
   B. Adsorption
   C. Wetting
   D. Complete wetting

10. There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?

    A. One
    B. Two
    C. Three
    D. None of these