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Question

Internal energy of a system increases, when the system

A
expands
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B
absorbs heat
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C
does work
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D
loses heat
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Solution

The correct option is B absorbs heat
Internal energy of a system includes all the energy associated with its constituent particles. When the system absorbs heat ,its internal energy increases, because the constituent particles gain energy. But for expansion or work done by the system and heat loss, the system actually loses energy, i.e. internal energy decreases.

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