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Two identical beakers A and B contain equal volumes of two different liquids at 60°C each and left to cool down. Liquid in A has density of 8 × 10 2 kg/m 3 and specific heat of 2000 J kg –1 K –1 while liquid in B has density of 10 3 kg m –3 and specific heat of 4000 J kg –1 K –1 . Which of the following best describes their temperature versus time graph schematically ? (assume the emissivity of both the beakers to be the same)

1. 60°C A and B T t
2. 60°C B T t A
3. 60°C A T t B
4. 60°C A T t B

Correct answer: 60°C B T t A

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