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If a graph is plotted between temperature of a body on degree Celsius (along y-axis) and degree Fahrenheit [along x-axis] at different temperatures, then the slope of the graph will be:

1. | $\frac{5}{9}$ | 2. | $\frac{9}{5}$ |

3. | $\frac{3}{5}$ | 4. | $\frac{5}{3}$ |

Subtopic: Temperature and Heat |

78%

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From the given heat and temperature graph of a substance, choose the correct statement:

1. | The latent heat of fusion is greater than the latent heat of vaporization. |

2. | The latent heat of vaporization is greater than the latent heat of fusion. |

3. | The specific heat in a solid state is more than the specific heat in a liquid state. |

4. | The specific heat in a liquid state is more than the specific heat in a solid state. |

Subtopic: Calorimetry |

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The thermal conductivities of two identical rods are k and 2k, respectively. If they are joined in parallel, then the ratio of heat flowing through them per second will be:

1. 1:2

2. 2:1

3. 1:1

4. 4:1

Subtopic: Conduction |

68%

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A bimetallic strip is shown in the figure. On cooling, which shape will it attain if ${\mathrm{\alpha}}_{\mathrm{brass}}>{\mathrm{\alpha}}_{\mathrm{steel}}:$

1. | 2. | ||

3. | 4. |

Subtopic: Thermal Expansion |

51%

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Four rods of the same material with different radii *r *and length $\mathcal{l}$* *are used to connect two heat reservoirs at different temperatures. In which of the following cases is the heat conduction fastest?

1. $r=\frac{1}{3}\mathrm{cm},$ $\mathcal{l}=\frac{1}{9}\mathrm{cm}$

2. *r* = 3 cm, *$\mathcal{l}$* = 9 cm

3. *r* = 4 cm, *$\mathcal{l}$* = 8 cm

4. *r* = 1 cm, *$\mathcal{l}$* = 1 cm

Subtopic: Conduction |

73%

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Two rods \(\mathrm{P}\) and \(\mathrm{Q}\) of equal length and having cross-sections \(A_P\)$\mathrm{and}$ \(A_Q\) respectively, have the same temperature difference across their ends. If \(k_P\) $\mathrm{and}$ \(k_Q\) are their thermal conductivities, then the condition for their equal rate of conduction of heat will be:

1. \(k_PA_P = k_QA_Q\)

2. \(\frac{\sqrt{k_P}}{A_P} - \frac{\sqrt{k_Q}}{A_Q}\)

3. \(k_PA_Q = k_QA_P\)

4. \(k^2_PA_P = k^2_QA_Q\)

Subtopic: Conduction |

86%

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50 g of ice at \(0^{\circ} \mathrm{C}\) is dropped in a calorimeter of negligible heat capacity containing 50 g of water at \(100^{\circ} \mathrm{C}\)$\mathrm{}$\(100^{\circ} \mathrm{C}\)

1. \(10^{\circ} \mathrm{C}\)$\mathrm{}$

2. Below \(0^{\circ} \mathrm{C}\)$$

3. \(20^{\circ} \mathrm{C}\)$\mathrm{}$

4. Above \(20^{\circ} \mathrm{C}\)$\mathrm{}$

Subtopic: Calorimetry |

59%

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When the pressure on the surface of water is increased, its boiling point will:

1. | Decrease | 2. | Increase |

3. | Remain same | 4. | Increase or decrease |

Subtopic: Calorimetry |

68%

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Three rods made of the same material, having the same cross-sectional area but different lengths 10 cm, 20 cm and 30 cm are joined as shown. The temperature of the junction will be:-

1. \(10.8^{\circ}\mathrm{C}\)

2. \(14.6^{\circ}\mathrm{C}\)

3. \(16.4^{\circ}\mathrm{C}\)

4. \(18.2^{\circ}\mathrm{C}\)

Subtopic: Conduction |

70%

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5 g of water at \(30^{\circ} \mathrm{C}\) and 5 g of ice at \(-20^{\circ} \mathrm{C}\) are mixed together in a calorimeter. The water equivalent of the calorimeter is negligible, and the specific heat and latent heat of ice are 0.5 \(\text{cal/g}^{\circ} \mathrm{C}\) and 80 \(\text{cal/g}\), respectively. The final temperature of the mixture is:

1. | \(0^{\circ} \mathrm{C}\) | 2. | \(-8^{\circ} \mathrm{C}\) |

3. | \(-4^{\circ} \mathrm{C}\) | 4. | \(2^{\circ} \mathrm{C}\) |

Subtopic: Calorimetry |

72%

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