railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Structure of Atom

ਇੱਕ ਇਲੈਕਟ੍ਰੌਨ ਦਾ ਪੁੰਜ ________ ਹੈ।

1
9.1 × 10-31 kg
2
1.67 × 10-27 kg  
3
9.1 × 10-35 kg
4
1.67 × 10-31 kg
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