# 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 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 $$A_P$$ $$A_Q$$ 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 $$100^{\circ} \mathrm{C}$$$$100^{\circ} \mathrm{C}$$, then the final temperature $$(T_m)$$ of the mixture will be: (neglect the heat loss)
1. $$10^{\circ} \mathrm{C}$$

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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