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CLASS 9th Science Matter in Our Surroundings notes

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  Study Material and Notes of Ch 1 Matter in Our Surrounding Class 9th Science Topics in the Chapter • Introduction • Physical Nature of Matter • Diffusion • Characteristics of Particles of Matter → Particles of matter have space between them → Particles of matter attract each other because of the force of attraction • States of Matter → Solid State → Liquid State → Gaseous State • Change of State of Matter • Effect of Temperature → Latent heat → Latent heat of fusion → Latent heat of vaporisation • Effect of change of pressure • Evaporation → Factors affecting the rate of evaporation → Evaporation causes cooling • Plasma • Bose-Einstein Condensate Introduction → Since early times human beings have been trying to understand their nature. Early Indian philosophers classified matter into five basic elements. The “Panch Tatva”– air, earth, fire, sky, and water. According to them, living as well as non-living things are made up of these elements. → Nowadays, scientists evolved to ...
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  DAV Class 8 SST Chapter 3 Question Answer Natural Resources Vegetation and Wildlife DAV Class 8 SST Chapter 3 Natural Resources Vegetation and Wildlife  Solutions A. Tick the correct option. 1. Which term is used for the plant community which grows without human interference? Answer:  natural vegetation 2. Which vegetation grows in hot and humid regions of the world?  Answer:  Tropical Evergreen Forests 3. The most common trees of Tropical Deciduous Forests are- Answer:  Sal and teak 4. Trees of Mediterranean Forests are have- Answer:  spiny and waxy leaves 5. The area under forests is depleting due to Answer:  human interference B. Fill in the blanks. 1. The assemblage of plant species in an environment is known as ___________. 2. ___________ and ___________ are two important factors for the plant growth. 3. Humus helps to maintain ___________ of the soil. 4. Hardwood trees have broad leaves to permit ___________ of surplus moisture. 5. Teak is...
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  DAV Class 8 SST Chapter 1 Question Answer Resources Utilisation and Development DAV Class 8 SST Chapter 1 Resources Utilisation and Development Solutions A. Tick the correct option.                                                                                                         1. Future generations will depend on solar energy because it is- Answer:  inexhaustible 2. Which one of the following resources can be recycled? Answer:  gold 3. All the abiotic resources include- Answer:  non-living things 4. Available resources that are not being tapped fully for the time being are called- Answer:  potential resources 5. Which one does not promote the conservation of resources? Answer:  use as mu...
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