Title Integrated Series 7th Class Chemistry- Solutions.pdf ✅

Class 7 Chemistry Table of Content 1. Fibre to Fabric 1 – 6 2. Acids and Bases 7 – 12 3. Physical And Chemical Changes 13 – 17 4. Water-A Precious Resource 18 – 21 5. Matter and Composition 22 – 34 6. Chemistry in Daily Life 35 – 41 7. Basic Cocepts of Chemistry 42 – 66


Class 7 – Chemistry | I – 7 Fiber to Fabric 2 cotton fibers. This crimped structure gives wool bulkiness, which helps in trapping air and providing insulation in colder temperatures. Cotton fibers, being smoother and flatter, have less bulk and are more lightweight compared to wool. 10. Correct option: (A) Woolen fabrics are known for their excellent insulation properties, making them ideal for keeping us warm during cold days. The crimped structure of wool fibers creates air pockets that trap heat, providing better insulation and retaining body warmth. During cold weather, wearing woolen clothing can help keep us cozy and comfortable. 11. Correct option: (D) Wool comes from sheep. Sheep are domesticated animals that are raised for their wool, which is the fibrous coat that grows on their bodies. The process of obtaining wool from sheep involves shearing, where the wool is carefully cut off the sheep's body to produce various woolen products. 12. Correct option: (C) Wool is obtained from the fleece (hair) of sheep, which is the natural covering of the sheep's body. The hair consists of wool fibers, and it is sheared off the sheep's body to yield the wool. 13. Correct option: (D) Sheep: Sheep are the most common source of wool and produce a variety of wool types, depending on the sheep breed. Goat: Goats provide several types of wool, including Mohair (from Angora goats) and Cashmere (Kashmir goats). Yak: Yaks, which live in the Himalayan region, also produce a type of wool known as yak wool. So, all three animals give wool. 14. Correct option: (B) Air is a poor conductor of heat. Meaning it does not conduct heat well compared to materials like metals. Air has low thermal conductivity, which is why it is used as an insulating material in various applications. When there is a temperature difference between two objects, air acts as a barrier, reducing the transfer of heat between them. 15. Correct option: (D) The Lohi breed of sheep is found in both Rajasthan and Punjab states in India. These sheep are adapted to the arid and semi-arid regions of these states and are known for their fine quality wool, which is used in the production of textiles and clothing. 16. Correct option: (D) The Rampur Bushair breed of sheep are found in both Uttar Pradesh and Himachal Pradesh states of India. These states are known for their diverse sheep breeds, and Rampur Bushair is one of the popular sheep breeds found in these regions. 17. Correct option: (D) The Nali breed of sheep is found in multiple states, including Rajasthan, Haryana, and Punjab. It is a popular breed known for its good wool quality and adaptability to the arid and semi-arid regions of these states. The Nali sheep are well-suited to the local climatic conditions and are reared for their wool.