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Monday, May 3, 2021
Wednesday, April 28, 2021
Tuesday, April 20, 2021
Aryabhata satellite launching day
आर्यभट्ट (उपग्रह) प्रक्षेपण दिवस : 19 अप्रैल
वर्ष 1975 में आज ही के दिन देश के पहले सेटेलाइट 'आर्यभट्ट' को अंतरिक्ष में पृथ्वी की कक्षा में भेजा गया था।
आर्यभट्ट (उपग्रह) :
• 19 अप्रैल 1975 को इसरो (ISRO) ने भारत के पहले कृत्रिम स्वदेशी उपग्रह (Artificial Satellite) आर्यभट्ट (Aryabhata) का प्रक्षेपण किया था.
• 19 अप्रैल 1975 को लॉन्च किए गए भारत के इस पहले वैज्ञानिक उपग्रह का वजन 360 किलोग्राम था।
• इस उपग्रह को भारत में ही बैंगलोर के पास पीन्या में Indian Space Research Organisation (इसरो) द्वारा तैयार किया गया था। परन्तु लॉन्च करने में अक्षम होने के कारण सोवियत यूनियन की मदद ली गई।
• सोवियत यूनियन (रूस) ने अपने इंटर कॉस्मॉस अंतरिक्ष यान की मदद से उपग्रह को पृथ्वी की कक्षा में स्थापित किया। इसके एवज में वर्ष 1972 में इसरो के यू. आर. राव ने सोवियत संघ रूस के साथ एक एग्रीमेंट साइन किया था जिसके तहत रूस भारतीय बंदरगाहों का इस्तेमाल जहाजों को ट्रैक करने के लिए कर सकता था।
• कृत्रिम उपग्रहों के निर्माण और अंतरिक्ष में उनके संचालन में अनुभव पाने के मकसद से आर्यभट्ट को डिजाइन किया गया था। इसका मुख्य उद्देश्य एक्स-रे, खगोल विद्या, वायुविज्ञान एवं सौर भौतिकी से जुड़ें प्रयोग करना था।
• यह भारत का पहला वैज्ञानिक उपग्रह था जो लॉन्च होने के 17 साल बाद 11 फरवरी 1992 को पृथ्वी पर वापस आया था।
नामकरण :
• इस उपग्रह का नाम भारत के प्रसिद्ध खगोलशास्त्री और गणितज्ञ आर्यभट्ट के नाम पर रखा गया था। आर्यभट्ट उन पहले व्यक्तियों में से एक थे जिन्होंने बीजगणित का प्रयोग किया था। इसके अलावा उन्होंने पाई का सही मान 3.1416 निकाला था।
• रिजर्व बैंक ने इस ऐतिहासिक उपलब्धि के पक्ष में वर्ष 1976 से 1997 के बीच 2 रुपए के नोट पर सैटेलाइट की तस्वीर लगाई थी।
JEE Main 2020 Topper Interview
Parth Dwivedi (100 Percentile):
Parth Dwivedi is one of those 9 students who secured 100 percentile in JEE Main 2020 Paper 1. Initially shocked upon knowing his JEE main result, Parth has secured 100 marks in Mathematics, 96 marks in Physics, and 96 marks in Chemistry. Consistently working hard to achieve success, Parth started off his IIT dream from 11th standard by commencing his preparation. For him, his father has always been an inspiration. A student of Allen Institute, Parth believes that his teachers helped him a lot to achieve his success. Much satisfied with his scores, this JEE main topper is now preparing to appear for JEE Advanced. Careers360 presents a JEE Main 2020 topper interview, Parth Dwivedi in which he specifies his secrets to his success.
Parth Dwivedi own views, let me write a few of my flaws -
- I am insecure about myself. More than the happiness of achieving success, I feel the fear of losing it one day.
- I can lose sight of the bigger picture, and I mean the much bigger picture. Being so engrossed in self betterment, studies and perfection, I tend to overlook why I am doing it. So, instead of making me happy, it can also make me more stressed.
- I am really bad at accepting compliments, though they make me feel great, but I am not really sure whether to accept it or tell the truth, which connects to the next point…
- I am not really sure that I deserve what I got. Though I state the contrary emphatically innumerable times, it is more to convince me than anyone else.
- I am bad at being patient, it is difficult to listen to things that I have already listened to.
- I enjoy gossip. As I loathe this about myself, I go to great lengths to avoid any, but even then some seeps in and I can’t help but listen to it. But it is just a question of willpower.
Writing all my flaws would take a lifetime, but these are a few of them, at least.
Oh, and also, commas are ubiquitous in my answers. Every time I am in doubt, I use one.
So, why should anyone follow me here?
Because sometimes one needs an answer with minimum biases and prejudices, which seep into one's mind with age.
Sometimes one needs to look at things from the perspective of a child.
Click here to listen in his own words
Acetone and uses
Acetone, a colorless liquid also known as Propanone, is a solvent used in manufacture of plastics and other industrial products. Acetone may also be used to a limited extent in household products, including cosmetics and personal care products, where its most frequent application would be in the formulation of nail polish removers. Acetone occurs naturally in the human body as a byproduct of metabolism.
Uses and benefits-
Acetone is a primary ingredient in many nail polish removers. It breaks down nail polish, making it easy to remove with a cotton swab or cloth. It is widely used because it can easily mix with water and evaporates quickly in the air.
Acetone is widely used in the textile industry for degreasing wool and degumming silk.
As a solvent, acetone is frequently incorporated in solvent systems or “blends,” used in the formulation of lacquers for automotive and furniture finishes. Acetone also may be used to reduce the viscosity of lacquer solutions.
Source-
www.chemicalsafetyfacts.org
Click here to know more about it
Sunday, April 18, 2021
Word Art Day-2021
उद्देश्य :
प्रत्येक वर्ष 15 अप्रैल को कलात्मक अभिव्यक्तियों की विविधता के बारे में जन जागरूकता के उद्देश्य से विश्व कला दिवस समारोह आयोजित किए जाते हैं जो कलाकारों के सतत विकास में योगदान को उजागर करने के साथ ही कलात्मक कृतियों व समाज के बीच संबंधों को सुदृढ़ करने में सहयोग करते हैं।
Click here to know more about World Art Day 2021
Click here to know about it in hindi
feature post
CARBON AND ITS COMPOUNDS-Functional Group
1. Name the functional groups present in the following compounds. a) CH 3 – CO –CH 2 –CH 2 –CH 2 –CH 3 b) CH...