A deep rectangular pond of surface area A, containing water (density = \(\rho,\) specific heat capacity = \(s\)), is located in a region where the outside air temperature is at a steady value of \(-26^{\circ}\mathrm{C}\). The thickness of the ice layer in this pond at a certain instant is \(x\). Taking the thermal conductivity of ice as \(k\), and its specific latent heat of fusion as \(L\), the rate of increase of the thickness of the ice layer, at this instant, would be given by:
1. \(\frac{26k}{x\rho L-4s}\)
2. \(\frac{26k}{x^2\rho L}\)
3. \(\frac{26k}{x\rho L}\)
4. \(\frac{26k}{x\rho L+4s}\)

Subtopic:  Conduction |
 52%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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Two uniform rods of length L and 2L and thermal coefficient of linear expansion 2α and α respectively, are connected as shown in the figure. The equivalent coefficient of linear expansion is:

                 
 

1. 3α4 2. 4α3
3. 2α3 4. 5α3
Subtopic:  Thermal Expansion |
 71%
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An object kept in a large room having an air temperature of \(25^\circ \text{C}\) takes \(12\) minutes to cool from \(80^\circ \text{C}\) to \(70^\circ \text{C}.\) The time taken to cool for the same object from \(70^\circ \text{C}\) to \(60^\circ \text{C}\) would be nearly:
1. \(10\) min
2. \(12\) min
3. \(20\) min
4. \(15\) min

Subtopic:  Newton's Law of Cooling |
 78%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following statement is correct regarding heat transfer?

1.  Forced convection requires gravity

2.  Natural convection requires gravity

3.  Radiation and forced convection requires gravity

4.  Neither natural nor forced convection requires gravity

Subtopic:  Convection |
 69%
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The fundamental interval, that is the number of division between LFP & UFP on the two scales X and Y are 50 and 150 respectively. The ice point on both the scales is  0°. If the temperature on the X-scale is 15°, then what is the temperature on the Y-scale ?

1. 30°
2. 45°
3. 60°
4. 75°

Subtopic:  Temperature and Heat |
 80%
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Recently, the phenomenon of super conductivity has been observed at 73 K. This temperature is nearly equal to

1. -288°F

2. -146°F

3. -328°F

4. +178°F

Subtopic:  Temperature and Heat |
 81%
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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. 59

2. 95

3. 35

4. 53

Subtopic:  Temperature and Heat |
 78%
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Which of the following is true in modern thermometry?

1. Triple point of water is fixed

2. Boiling point of water is fixed

3. Melting point of ice is fixed

4. Dew point is fixed

Subtopic:  Calorimetry |
 78%
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A metal wire of length and area of cross-section A is fixed at its ends by rigid supports at negligible tension. If this wire is cooled, then the tension in it will be

1. Proportional to l

2. Inversely proportional to l

3. Independent of l

4. Independent of A

Subtopic:  Thermal Stress |
 63%
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Which temperature on the Fahrenheit scale is numerically the same as that on the Celsius scale?

1. -40°F

2. -42°F

3. -70°F

4. -72°F

Subtopic:  Temperature and Heat |
 90%
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