Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Physics Thermodynamics First law of thermodynamics

रुद्धोष्म प्रसार के संबंध में निम्न में से कौन सा कथन सही है? 

1
ΔU = 0
2
ΔU = ऋणात्मक
3
ΔU = धनात्मक
4
ΔW = 0
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