The States of Matter – Multiple Choice Questions (MCQs)

1. 37. An isolated system allows the exchange of:

   • A. Neither matter nor energy
   • B. Only matter
   • C. Only energy
   • D. Both matter and energy

2. 38. The phenomenon of flow of liquids through small pores under pressure is called:

   • A. Effusion
   • B. Diffusion
   • C. Osmosis
   • D. Dialysis

3. 39. The compressibility factor (Z) for an ideal gas is:

   • A. 1
   • B. 0
   • C. Greater than 1
   • D. Less than 1

4. 40. For real gases, at very low pressures, the compressibility factor (Z) approaches:

   • A. Less than 1
   • B. 0
   • C. Greater than 1
   • D. 1

5. 41. At high pressures, for real gases, the compressibility factor (Z) is usually:

   • A. Greater than 1
   • B. Less than 1
   • C. Equal to 1
   • D. Zero

6. 42. The process of evaporation causes:

   • A. Heating
   • B. Cooling
   • C. No change in temperature
   • D. Condensation

7. 43. The change in enthalpy during the transition from solid to liquid is called:

   • A. Enthalpy of fusion
   • B. Enthalpy of vaporization
   • C. Enthalpy of sublimation
   • D. Enthalpy of solution

8. 44. The change in enthalpy during the transition from liquid to gas is called:

   • A. Enthalpy of vaporization
   • B. Enthalpy of fusion
   • C. Enthalpy of sublimation
   • D. Enthalpy of solution

9. 45. Which of the following is a unit of viscosity?

   • A. Newton
   • B. Pascal
   • C. Poise
   • D. Joule

10. 46. Meniscus in a liquid column is formed due to:

    • A. Surface tension
    • B. Viscosity
    • C. Density
    • D. Boiling point

11. 47. In a liquid, if cohesive forces are stronger than adhesive forces with the container, the meniscus will be:

    • A. Convex
    • B. Concave
    • C. Flat
    • D. Irregular

12. 48. Cubic close packing (CCP) and hexagonal close packing (HCP) both have a coordination number of:

    • A. 6
    • B. 8
    • C. 12
    • D. 4