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A train x running at 74 km/h crosses another train y running at 52 km/h in the opposite direction in 12 seconds. If the length of y is two-thirds that of x, then what is the length of y (in m)?

Fe + CuSO4 → FeSO4 + Cu The above reaction is an example of a उपरोक्त अभिक्रिया ......... का एक उदाहरण है–

Four words have been given, out of which three are alike in some manner and one is different. Select the odd word.

Lustre doesn’t depend on

Large number of thin strips of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be 20 सेमी. फोकस दूरी के एक उत्तल लेंस की सतह पर सफेद घोड़े का प्रतिबिम्ब बनाने के लिए बड़ी संख्या में काले रंग की पतली पट्टियाँ बनाई जाती हैं। वह प्रतिबिम्ब कैसा होगा?