railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Work Power Energy

जब 1 किलो कोयले को जलाया जाता है तो कितनी ऊर्जा निकलती है?

1
3 x 107 J
2
4 x 107 J
3
3 x 108 J
4
4 x 108 J
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