Science and Technology Current Affairs June 2018 by Dr Ravi Agrahari for UPSC 2019 exam StudyIQ - Videos

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  2. sir english ka maximum use krte h aap …gavrav sir aur mahipal sir aur bhavesh sir ki vocal smjh m aati h proper lekin aapki aur saurav pandey sir ki aur ek mam h vo mainly english ka use hi karti h bahut km hindi ka use krti h jisse smjh m nh aata

  3. Sir अगर लिथियम आयन बैट्री का efficiency 100% तो पॉवर बैंक 10000mah , 8000mah तक ही क्यों काम करता ।

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