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Q. No.\(200\) g of water at \(20^\circ\)C and \(300\) g of water at \(70^\circ\)C are mixed in a calorimeter of negligible heat capacity. Assume no loss of heat. The final temperature is:
1. \(40^\circ\)C
2. \(50^\circ\)C
3. \(60^\circ\)C
4. \(45^\circ\)C
1. \(40^\circ\)C
2. \(50^\circ\)C
3. \(60^\circ\)C
4. \(45^\circ\)C
Subtopic: Â Calorimetry |
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Two liquids flow through a heat exchanger and exchange heat energy.
The first liquid has a mass flow rate \(\Big(\frac{dm}{dt}\Big)=r_1,\) and its temperature rises by \(\Delta\theta_1.\) For the second liquid, the flow rate \(\Big(\frac{dm}{dt}\Big)=r_2,\) and the temperature fall is \(\Delta\theta_2.\) The ratio of their specific heat capacities is:
1. \(\frac{\Delta\theta_1}{\Delta\theta_2}\)
2. \(\frac{r_1}{r_2}\)
3. \(\frac{r_2\Delta\theta_2}{r_1\Delta\theta_1}\)
4. \(\frac{r_2\Delta\theta_1}{r_1\Delta\theta_2}\)
The first liquid has a mass flow rate \(\Big(\frac{dm}{dt}\Big)=r_1,\) and its temperature rises by \(\Delta\theta_1.\) For the second liquid, the flow rate \(\Big(\frac{dm}{dt}\Big)=r_2,\) and the temperature fall is \(\Delta\theta_2.\) The ratio of their specific heat capacities is:
1. \(\frac{\Delta\theta_1}{\Delta\theta_2}\)
2. \(\frac{r_1}{r_2}\)
3. \(\frac{r_2\Delta\theta_2}{r_1\Delta\theta_1}\)
4. \(\frac{r_2\Delta\theta_1}{r_1\Delta\theta_2}\)
Subtopic: Â Calorimetry |
 72%
From NCERT
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The specific heat capacity of a body depends on:
| 1. | the heat given |
| 2. | the temperature raised |
| 3. | the mass of the body |
| 4. | the material of the body |
Subtopic: Â Calorimetry |
 74%
From NCERT
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When \(0.15\) kg of ice at \(0^\circ \text{C}\) is mixed with \(0.30\) kg of water at \(50^\circ \text{C}\) in a container, the resulting temperature is \(6.7^\circ \text{C}.\)
The heat of fusion of ice is: (\(S_{\text{water}}=4186\) J kg-1 K-1)
1. \( 3.43 \times 10^4\) Jkg-1
2. \( 3.34 \times 10^4\) Jkg-1
3. \( 3.34 \times 10^5\) Jkg-1
4. \(4.34 \times 10^5\) Jkg-1
Subtopic: Â Calorimetry |
 58%
From NCERT
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