defence exam Agniveer Army Technical Mock Test Series 2025 General Knowledge Geography (World Geography) Climatology

ब्रह्मांड में सबसे प्रचुर तत्त्व है :

1
ऑक्सीजन
2
हाइड्रोजन 
3
कार्बन डाइऑक्साइड
4
सिलिकॉन
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