Is Matter Around Us Pure | क्या हमारे आसपास के पदार्थ शुद्ध हैं | NCERT | Class 9 Science Chapter 2

दोहरान |क्या हमारे आस पास के पदार्थ शुद्ध है ?|शुद्ध पदार्थ |मिश्रण के प्रकार |विषमांगी मिश्रण |समांगी मिश्रण |मिश्रण |विलयन क्या है ?|सारांश |विलेय एवं विलायक

दोहरान |क्या हमारे आस पास के पदार्थ शुद्ध है ?|शुद्ध पदार्थ |मिश्रण |मिश्रण के प्रकार |समांगी मिश्रण |विषमांगी मिश्रण |विलयन क्या है ?|विलेय एवं विलायक |सारांश

दोहरान |क्या हमारे आस पास के पदार्थ शुद्ध है ?|शुद्ध पदार्थ |मिश्रण के प्रकार |विषमांगी मिश्रण |समांगी मिश्रण |मिश्रण |विलयन क्या है ?|सारांश |विलेय एवं विलायक

Two numbers A and B are in the ratio 5 : 2. If 4 is added to each number then this ratio becomes 9 : 4. If 5 is subtracted from each of the original numbers , then the ratio of A and B will be: दो संख्याएं A और B 5 : 2 के अनुपात में हैं |यदि प्रत्येक संख्या में 4 जोड़ा जाए, तो यह अनुपात 9 : 4 हो जाता है | यदि प्रत्येक मूल संख्या में से 5 घटाया जाए, तो A और B का अनुपात क्या हो जाएगा ?

When x is subtracted from each of 19, 28, 55 and 91, the numbers so obtained in this order are in proportion . What is the mean proportion between (x + 9) and x^2 ? जब x को 19, 28, 55 और 91 में से घटाया जाता है, तो इस क्रम में प्राप्त संख्याएँ अनुपात में होती हैं। (x + 9) और x^2 के बीच माध्य अनुपात क्या है?

"The Centre for Science and Environment announced that samples of 12 soft drink brands collected for testing from in and around capital of India contained residues of four extremely toxic pesticides and insecticide". Assuming the above finding to be true consider the statements I and II and decide which of the following options is most appropriate. Statements: I. the sample had enough poison to cause long-term cancer, damage to the nervous and reproductive systems, birth defects and severe disruption of the immune system. II. These products are world class and are the same as are sold in Europe and the US and are tested by top-grade labs like Vimta in Hyderabad and TNO in the Netherlands. 1) I is strengthening the finding while II is not weakening it. 2) I is not strengthening the finding while II is weakening it. 3) Iis strengthening the finding while II weakening it. 4) Iis weakening the finding while II is strengthening it. 5) None of these