Home 2nd Year Physics Notes Class 12 Physics Chapter 17 Short Questions and Numerical Notes – Physics of Solids

# Class 12 Physics Chapter 17 Short Questions and Numerical Notes – Physics of Solids

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In this post, I am sharing the Class 12 Physics Chapter 17 Short Questions and Numerical Notes PDF for the students of Intermediate Part 2. This chapter’s name is Physics of Solids. Students can download the Class 12 Physics Chapter 17 Short Questions and Numerical Notes PDF on their laptops or mobile. These Physics Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Physics Notes PDF chapters.

## FSC Part 2 Physics Chapter 17 Short Questions and Numerical Notes – Physics of Solids

Class 12 Physics Notes

#### Distinguished between crystalline, amorphous and polymeric solids.

(i) Crystalline Solid:

The solids whose atoms or molecules are arranged in a regular manner which is repeated periodically inside the crystal in three dimensions are called crystalline solids. e.g., metals such as copper, iron, zine, sodium chloride and ceramics.

Note: They have definite melting point.

(ii) Amorphous or Glassy Solids: The solids which have no regular arrangement of their atoms or molecules are called amorphous solids. e.g, ordinary glass.

Note: They have no definite melting point.

(iii) Polymeric Solids: Polymeric may be more or less solid materials with a structure that is intermediate between order and disorder. So we can say that such solids are pqrtially or poorly crystalline solids, e.g., plastic and synthetic rubbers.

Note: Their specific gravity is very low.

#### What is meant by hysteresis loss? How is it used in the construction of a transformer?

Hysteresis Loss:

The area of the loop is a measure of the energy needed to magnetize and demagnetize the specimen during each cycle of the magnetizing current. This is the energy required to do work against internal friction of the domains. This work like all work that is done against friction is dissipated as heat so it is called hysteresis loss. In transformer the cores of electromagnets used for alternating currents where the specimen repeatedly undrgoes magnitization should have narrow hysteresis curves of small area to minimize the waste of energy.

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