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Q.1 (1) પ્રથમ સોલરસેલ ક્યારે તૈયાર થયો ?
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Q.2 (4) ટેલિફોનની શોધ ક્યારે થઈ ?
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Q.3 (3) જૈવિક વિજ્ઞાનની શોધ કરનાર વૈજ્ઞાનિક કોણ છે ?
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Q.4 (2) વૈજ્ઞાનિક કથાઓ સાથે સંકળાયેલ મહાન સાહિત્યકાર કોણ છે ?
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Q.5 (5) ડી.એન.એ. પર સંશોધન કરનાર ભારતીય વિજ્ઞાની કોણ ?