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. 59 2. 95
3. 35 4. 53

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 αbrass>αsteel:

 

1. 2.
3. 4.
Subtopic:  Thermal Expansion |
 51%
From NCERT
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Four rods of the same material with different radii and length l are used to connect two heat reservoirs at different temperatures. In which of the following cases is the heat conduction fastest?

1. r=13cm, l=19cm

2. r = 3 cm, l = 9 cm

3. r = 4 cm, l = 8 cm

4. r = 1 cm, l = 1 cm

Subtopic:  Conduction |
 73%
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Two rods \(\mathrm{P}\) and \(\mathrm{Q}\)  of equal length and having cross-sections \(A_P\) and \(A_Q\) respectively, have the same temperature difference across their ends. If \(k_P\) 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. \(20^{\circ} \mathrm{C}\)

4. Above \(20^{\circ} \mathrm{C}\)

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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