03. Newton's Law of Cooling and Seebeck Effect
« Previous Topic: 02. Radiation Last Topic in »
Heat Transfer

149623 A body cools down from $52.5^{\circ} \mathrm{C}$ to $47.5^{\circ} \mathrm{C}$ in 5 minutes and from $47.5^{\circ} \mathrm{C}$ to $42.5^{\circ} \mathrm{C}$ in 7.5 minute. Then the temperature of the surroundings is

1 $39^{\circ} \mathrm{C}$
2 $25^{\circ} \mathrm{C}$
3 $35^{\circ} \mathrm{C}$
4 $15^{\circ} \mathrm{C}$
AP EAMCET-24.08.2021
Heat Transfer

149624 Match the following (where $R$ is gas constant)
| Column-I | Column-II | |
| :--- | :--- | :--- |
| (a) Molar specific heat of helium gas at constant volume | (i) | $3 \mathrm{R}$ |
| (b) Molar specific heat of oxygen at constant volume | (ii) | $3.5 \mathrm{R}$ |
| (c) Molar specific heat of carbon dioxide at constant volume | (iii) | $1.5 \mathrm{R}$ |
| (d) Molar specific heat of hydrogen at constant pressure | (iv) | $2.5 \mathrm{R}$ |

1 (a – i), (b – ii), (c – iii), (d – iv)
2 (a – ii), (b – iii), (c – iv), (d – i)
3 (a – iii), (b – iv), (c – i), (d – ii)
4 (a – iv), (b – i), (c – ii), (d – iii)
AP EAMCET-06.09.2021
Heat Transfer

149625 A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room:

1 $4 \mathrm{~min}$
2 $2 \mathrm{~min}$
3 $1 \mathrm{~min}$
4 $3 \mathrm{~min}$
Karnataka CET-2018
Heat Transfer

149627 Two metal spheres $S_{1}$ and $S_{2}$ are made of the same material and have identical surface finish. The mass of $S_{1}$ is thrice that of $S_{2}$. Both the spheres are insulated from each other and are heated to the same high temperature and placed in the same room having lower temperature. The ratio of initial rates of cooling of $S_{1}$ and $S_{2}$ is

1 $\left(\frac{1}{3}\right)^{1 / 3}$
2 $\frac{1}{\sqrt{3}}$
3 $\frac{\sqrt{3}}{1}$
4 $\frac{1}{3}$
AP EAMCET-25.04.2018
NEET DIGITAL LIBRARY
Heat Transfer

149623 A body cools down from $52.5^{\circ} \mathrm{C}$ to $47.5^{\circ} \mathrm{C}$ in 5 minutes and from $47.5^{\circ} \mathrm{C}$ to $42.5^{\circ} \mathrm{C}$ in 7.5 minute. Then the temperature of the surroundings is

1 $39^{\circ} \mathrm{C}$
2 $25^{\circ} \mathrm{C}$
3 $35^{\circ} \mathrm{C}$
4 $15^{\circ} \mathrm{C}$
AP EAMCET-24.08.2021
Heat Transfer

149624 Match the following (where $R$ is gas constant)
| Column-I | Column-II | |
| :--- | :--- | :--- |
| (a) Molar specific heat of helium gas at constant volume | (i) | $3 \mathrm{R}$ |
| (b) Molar specific heat of oxygen at constant volume | (ii) | $3.5 \mathrm{R}$ |
| (c) Molar specific heat of carbon dioxide at constant volume | (iii) | $1.5 \mathrm{R}$ |
| (d) Molar specific heat of hydrogen at constant pressure | (iv) | $2.5 \mathrm{R}$ |

1 (a – i), (b – ii), (c – iii), (d – iv)
2 (a – ii), (b – iii), (c – iv), (d – i)
3 (a – iii), (b – iv), (c – i), (d – ii)
4 (a – iv), (b – i), (c – ii), (d – iii)
AP EAMCET-06.09.2021
Heat Transfer

149625 A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room:

1 $4 \mathrm{~min}$
2 $2 \mathrm{~min}$
3 $1 \mathrm{~min}$
4 $3 \mathrm{~min}$
Karnataka CET-2018
Heat Transfer

149627 Two metal spheres $S_{1}$ and $S_{2}$ are made of the same material and have identical surface finish. The mass of $S_{1}$ is thrice that of $S_{2}$. Both the spheres are insulated from each other and are heated to the same high temperature and placed in the same room having lower temperature. The ratio of initial rates of cooling of $S_{1}$ and $S_{2}$ is

1 $\left(\frac{1}{3}\right)^{1 / 3}$
2 $\frac{1}{\sqrt{3}}$
3 $\frac{\sqrt{3}}{1}$
4 $\frac{1}{3}$
AP EAMCET-25.04.2018
Join With Us for More Updates
Heat Transfer

149623 A body cools down from $52.5^{\circ} \mathrm{C}$ to $47.5^{\circ} \mathrm{C}$ in 5 minutes and from $47.5^{\circ} \mathrm{C}$ to $42.5^{\circ} \mathrm{C}$ in 7.5 minute. Then the temperature of the surroundings is

1 $39^{\circ} \mathrm{C}$
2 $25^{\circ} \mathrm{C}$
3 $35^{\circ} \mathrm{C}$
4 $15^{\circ} \mathrm{C}$
AP EAMCET-24.08.2021
Heat Transfer

149624 Match the following (where $R$ is gas constant)
| Column-I | Column-II | |
| :--- | :--- | :--- |
| (a) Molar specific heat of helium gas at constant volume | (i) | $3 \mathrm{R}$ |
| (b) Molar specific heat of oxygen at constant volume | (ii) | $3.5 \mathrm{R}$ |
| (c) Molar specific heat of carbon dioxide at constant volume | (iii) | $1.5 \mathrm{R}$ |
| (d) Molar specific heat of hydrogen at constant pressure | (iv) | $2.5 \mathrm{R}$ |

1 (a – i), (b – ii), (c – iii), (d – iv)
2 (a – ii), (b – iii), (c – iv), (d – i)
3 (a – iii), (b – iv), (c – i), (d – ii)
4 (a – iv), (b – i), (c – ii), (d – iii)
AP EAMCET-06.09.2021
Heat Transfer

149625 A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room:

1 $4 \mathrm{~min}$
2 $2 \mathrm{~min}$
3 $1 \mathrm{~min}$
4 $3 \mathrm{~min}$
Karnataka CET-2018
Heat Transfer

149627 Two metal spheres $S_{1}$ and $S_{2}$ are made of the same material and have identical surface finish. The mass of $S_{1}$ is thrice that of $S_{2}$. Both the spheres are insulated from each other and are heated to the same high temperature and placed in the same room having lower temperature. The ratio of initial rates of cooling of $S_{1}$ and $S_{2}$ is

1 $\left(\frac{1}{3}\right)^{1 / 3}$
2 $\frac{1}{\sqrt{3}}$
3 $\frac{\sqrt{3}}{1}$
4 $\frac{1}{3}$
AP EAMCET-25.04.2018
For More Updates join with Us
Heat Transfer

149623 A body cools down from $52.5^{\circ} \mathrm{C}$ to $47.5^{\circ} \mathrm{C}$ in 5 minutes and from $47.5^{\circ} \mathrm{C}$ to $42.5^{\circ} \mathrm{C}$ in 7.5 minute. Then the temperature of the surroundings is

1 $39^{\circ} \mathrm{C}$
2 $25^{\circ} \mathrm{C}$
3 $35^{\circ} \mathrm{C}$
4 $15^{\circ} \mathrm{C}$
AP EAMCET-24.08.2021
Heat Transfer

149624 Match the following (where $R$ is gas constant)
| Column-I | Column-II | |
| :--- | :--- | :--- |
| (a) Molar specific heat of helium gas at constant volume | (i) | $3 \mathrm{R}$ |
| (b) Molar specific heat of oxygen at constant volume | (ii) | $3.5 \mathrm{R}$ |
| (c) Molar specific heat of carbon dioxide at constant volume | (iii) | $1.5 \mathrm{R}$ |
| (d) Molar specific heat of hydrogen at constant pressure | (iv) | $2.5 \mathrm{R}$ |

1 (a – i), (b – ii), (c – iii), (d – iv)
2 (a – ii), (b – iii), (c – iv), (d – i)
3 (a – iii), (b – iv), (c – i), (d – ii)
4 (a – iv), (b – i), (c – ii), (d – iii)
AP EAMCET-06.09.2021
Heat Transfer

149625 A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room:

1 $4 \mathrm{~min}$
2 $2 \mathrm{~min}$
3 $1 \mathrm{~min}$
4 $3 \mathrm{~min}$
Karnataka CET-2018
Heat Transfer

149627 Two metal spheres $S_{1}$ and $S_{2}$ are made of the same material and have identical surface finish. The mass of $S_{1}$ is thrice that of $S_{2}$. Both the spheres are insulated from each other and are heated to the same high temperature and placed in the same room having lower temperature. The ratio of initial rates of cooling of $S_{1}$ and $S_{2}$ is

1 $\left(\frac{1}{3}\right)^{1 / 3}$
2 $\frac{1}{\sqrt{3}}$
3 $\frac{\sqrt{3}}{1}$
4 $\frac{1}{3}$
AP EAMCET-25.04.2018
NEET DIGITAL LIBRARY