Free Crystalline and Amorphous Solids MCQs with Answers

1. The materials in which disordered structure of liquid is frozen are:

• A. Amorphous
• B. Crystalline
• C. Polycrystalline
• D. Quartz

Explanation: The materials in which the disordered structure of a liquid is frozen are typically referred to as amorphous solids. These materials do not have a long-range ordered structure like crystals, but instead, their atomic or molecular arrangements are disordered, similar to the structure of a liquid. One common example of such materials is glass.

2. A structure that is intermediate between solid and liquid is called

• A. metallic solid.
• B. polymeric solid.
• C. crystalline solid.
• D. amorphous solid.

Explanation: Here's an explanation: * D) Amorphous solid: An amorphous solid is considered an intermediate structure between a solid and a liquid because it lacks the long-range, repeating, ordered atomic structure characteristic of a crystalline solid. Unlike crystalline solids, amorphous solids do not have a distinct melting point; instead, they gradually soften over a range of temperatures, behaving somewhat like very viscous liquids. This lack of a definitive structure and gradual transition behavior makes them intermediate. Glass, plastics, and gels are common examples of amorphous solids.

3. In terms of structure, nylon is an example of

• A. glassy solids
• B. polymeric solids
• C. crystalline solids
• D. amorphous solids

Explanation: Nylon is classified as an amorphous solid because its molecular chains are arranged in a random or disordered manner, unlike the highly ordered structure of crystalline solids. This lack of long-range order gives amorphous solids unique properties. The other options are incorrect because nylon does not exhibit the characteristics of glassy, polymeric, or crystalline solids.

4. A solid containing irregular arrangement of molecules produces irregular fragments uponbreaking. This solid is calledI. amorphousII. crystallineIII. polymeric

• A. I only.
• B. II only.
• C. I and III.
• D. II and III.

Explanation: The correct answer is I only. Amorphous solids are characterized by an irregular arrangement of molecules, which causes them to break into irregular fragments. In contrast, crystalline solids have a regular, repeating pattern of molecules, leading to well-defined fragments upon breaking. Polymers can have both regular and irregular structures, but the question specifically refers to the irregular arrangement leading to irregular fragments, which is characteristic of amorphous solids.

5. Which of the following is classified as a main rock?

• A. Metamorphic
• B. Sedimentary
• C. Igneous
• D. Both Options A and B are correct

Explanation: Option A; Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Option B: Common sedimentary rocks include sandstone, limestone, and shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans. When buried, the sediments lose water and become cemented to form rock.Option C: Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.

6. Ancient glass becomes milky due to

• A. Refraction
• B. Crystallization
• C. Volatilization
• D. Dispersion

Explanation: Ancient glass, an amorphous solid, undergoes alternate heating due to exposure to the sun during the day and cooling at night and is converted into partly crystalline form which results in the milky appearance. Refraction is the bending of light as it moves from a transparent substance into another. Volatilization is when a solid or liquid chemical substance is converted into vapours.

7. Which one of them is known as super cooled liquids?

• A. Glass
• B. Diamond
• C. Silica
• D. Carbon

Explanation: Amorphous solids have the tendency to flow slowly. It does not form a crystalline solid structure as particles in solids do not move but here it moves. Hence it is called a supercooled liquid.Glass is amorphous solid