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Preeti Dabral 1 year, 9 months ago
माँग के नियम के अनुसार यदि अन्य तत्व समान रहें तो एक वस्तु की माँगी गई मात्रा तथा उस वस्तु की कीमत में विपरीत संबंध होता है। अर्थात् वस्तु की कीमत बढ़ने पर वस्तु की माँगी गई मात्रा में संकुचन आ जाता है तथा वस्तु की कीमत घटने पर वस्तु की माँगी गई मात्रा विस्तृत हो जाती है।
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Preeti Dabral 1 year, 9 months ago
वर्षा जल संग्रहण :- यह एक तकनीक है जिसमें वर्षा जल को खाली स्थानों, घरों में टैंक में, बेकार पड़े कुएँ में भरा जाता है। बाद में इसका प्रयोग किया जाता है। पर्वतीय क्षेत्रों में ‘गुल' तथा ‘कुल' जैसी वाहिकाओं से नदी की धारा का रास्ता बदलकर खेतों की सिचाई।
भारत के विभिन्न भागों में वर्षा जल संग्रहण की दी विधियाँ :-
- राजस्थान में पीने का जल एकत्रित करने के लिए छत वर्षा जल संग्रहण आम तकनीक है। पश्चिम बंगाल में बाढ़ के दौरान बाढ़ जल वाहिकाएँ बनाते हैं।
- शुष्क तथा अर्ध शुष्क क्षेत्रों में वर्षा जल एकत्रित करने के लिए गड्ढ़ों का निर्माण।
- नदी पर बाँध बनाकर इससे अनेक प्रकार के उद्देश्यों को पूरा करना, बहुउद्देशीय नदी घाटी परियोजना कहते हैं।
- जल विद्युत उत्पादन
- सिंचाई
- घरेलू व औद्योगिक जल आपूर्ति
- नौचालन व पर्यटन
- बाढ़ नियंत्रण
- मछली पालन
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Preeti Dabral 2 years ago
“The greater the valency of the flocculating ion added, the greater is its power to cause precipitation. This is known as Hardy-Schulze rule.” The coagulating power increases with the valency of an ion.
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Vikash Singh Vikash Singh 1 year, 10 months ago
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