engineering recuitment UPSSSC Assistant Boring Technician 2022 Mock Test Basic Science and Engineering Mass Weight and Density

पूरे ब्रह्मांड में द्रव्यमान ______ रहता है।

1
परिवर्तनीय
2
शून्य
3
स्थिर
4
ऋणात्मक
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