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درجہ حرارت 7°C سے −12°C گرتا ہے۔ زوال کتنا بڑا ہے؟

A19°C
B7°C
C12°C
D5°C
Answer & Solution
Correct answer: A. 19°C
زوال ہے 7 − (−12) = 7 + 12 = 19°C۔
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