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Which of the following statement is correct? निम्नलिखित में से कौन सा कथन सही है ? I. Prarthana Samaj was established in 1867. I. प्रार्थना समाज 1867 में स्थापित किया गया था। II. Aligarh Muslim University was founded by Moulana Abul Kalam Azad. II. अलीगढ़ मुस्लिम विश्वविद्यालय की स्थापना मौलाना अबुल कलाम आजाद ने की थी।

......... is the study of cognitive development that is concerned with basic mechanics of learning . ______ संज्ञानात्मक विकास का अध्ययन है जो सीखने के बुनियादी यांत्रिकी से संबंधित है।

The average of 22 numbers is 37.5. The average of first 12 numbers is 40.6 and the average of the last 12 numbers is 35.4. If 11th and 12th numbers are excluded, then what is the average of the remaining numbers?

A convex mirror focal length f (in air), is immersed in a fluid ( = 4/3). The focal length of the mirror in liquid will be –

Parts of the following sentence have been given as options. One of them may contain an error. Select the part that contains the error from the given options. If you don't find any error, mark 'No error' as your answer. The reduced air pressure on airline flights can lessen the amount of oxygen in passengers' blood for twenty-five percent.

If K and L shells of an atom are full, then what would be the total number of electrons in the atom? यदि किसी परमाणु के K और L कोश पूर्णतया भरे हुए हैं, तो परमाणु में इलेक्ट्रानों की कुल संख्या कितनी होगी।

A _____ is formed when each colour of the white light is refracted in the prism at a different angle. ......... तब बनता है, जब श्वेत प्रकाश का प्रत्येक रंग प्रिज्म में एक अलग कोण पर अपवर्तित होता है–