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भारत का आर्थिक विकास सिंधु घाटी सभ्यता से आरम्भ माना जाता है। सिंधु घाटी सभ्यता की अर्थव्यवस्था मुख्यतः व्यापार पर आधारित प्रतीत होती है जो यातायात में प्रगति के आधार पर समझी जा सकती है। लगभग 600 ई॰पू॰ महाजनपदों में विशेष रूप से चिह्नित सिक्कों को ढ़ालना आरम्भ कर दिया था। इस समय को गहन व्यापारिक गतिविधि एवं नगरीय विकास के रूप में चिह्नित किया जाता है। 300 ई॰पू॰ से मौर्य काल ने भारतीय उपमहाद्वीप का एकीकरण किया। राजनीतिक एकीकरण और सैन्य सुरक्षा ने कृषि उत्पादकता में वृद्धि के साथ, व्यापार एवं वाणिज्य से सामान्य आर्थिक प्रणाली को बढ़ाव मिल।
1. Solution : A push - to open a door, we push it. As pull - to move a grass roller on a lawn, it is pulled by a gardener.
2.Like all fossil fuels, it is a non-renewable source of energy. It is extracted from crude oil and natural gas. The main composition of LPG are hydrocarbons containing three or four carbon atoms. ... Some of the liquid LPG then boils to produce vapour.
3. In the process of doing work, the object that is doing the work exchanges energy with the object upon which the work is done. When the work is done upon the object, that object gains energy. ... A moving car possesses mechanical energy due to its motion (kinetic energy).
5.Magma heats nearby rocks and underground aquifers. Hot water can be released through geysers, hot springs, steam vents, underwater hydrothermal vents, and mud pots. These are all sources of geothermal energy. Their heat can be captured and used directly for heat, or their steam can be used to generate electricity
6. Crude oil means a mixture of hydrocarbons that exists in liquid phase in natural underground reservoirs and remains liquid at atmospheric pressure after passing through surface separating facilities. ... (2) Liquids produced at natural gas processing plants are excluded.
7. The burning of fossil fuels produces carbon dioxide, water, and energy; the process of burning fossil fuels is known as "combustion." Energy is either absorbed into the environment (endothermic reaction) or released into the environment (exothermic reaction) during chemical reactions, and chemical bonds are broken
8. Electric energy into sound energy. The loudspeaker converts electrical into sound energy.
9. Sound energy is produced when a force causes an object or substance to vibrate
10. The solar, tidal and wind energy are suitable for the arid and coastal areas