1. भारतीय भौतिक विज्ञानी सत्येंद्र नाथ बोस द्वारा दिए गए कांटम सूत्रीकरण (फॉर्मूलेशन) के आधार पर अल्बर्ट आइंस्टीन ने किस वर्ष में पदार्थ की एक नई अवस्था, बोस-आइंस्टीन कंडेन्सेट (BEC) का अनुमान 1924 में लगाया था।

2. बोस-आइंस्टीन संघनन (BEC) पदार्थ की एक अवस्था है जिसमें बोसॉन कणों का एक समूह एक ही क्वांटम अवस्था में होता है।

Answer: A) An ion Explanation: An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons is called an Ion. Cation: An ion is a cation (positive ion) if it is created by electron loss and is attracted to the cathode in electrolysis. Anion: An ion is an anion (negative ion) if it is created by an electron gain and is attracted to the anode.   The valence of an ion is equal to the number of electrons lost or gained and is indicated by a plus sign for cations and a minus sign for anions. Ex: Na +, Cl−, Ca ++,...

undefined

Answer: B) Both b & c follows Explanation: Clearly, People cannot be deprived of enjoying the festival for lack of arrangements. Also, it becomes necessary to deploy police to regulate big crowds and avert any mishap in public gatherings. Further, it costs nothing but might prove useful to put hospitals on alert to be ready to provide quick medical aid to patients in case of any eventuality. So, both b and c follow.