Q. When heat is added to a system and no work is done, the internal energy

जब किसी सिस्टम में ऊष्मा डाली जाती है और कोई कार्य नहीं किया जाता है, तो आंतरिक ऊर्जा

Decreases
कम हो जाती है

Increases
बढ़ता है

Remains same
वैसा ही रहता है

Becomes zero
शून्य हो जाता है

From the first law $Q = \Delta U + W$ , if $W = 0$ , then $Q = \Delta U$ . Heat added increases the internal energy of the system.

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