- 1(current)
Q. No.Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity \(2K\) while that in the middle has thermal conductivity \(K\). The left end of the combination is maintained at temperature \(3T\) and the right end at \(T.\) The rods are thermally insulated from outside. In the steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(\dfrac{T_1}{T_2}\) is:
| 1. | \(\dfrac{5}{3}\) | 2. | \(\dfrac{5}{4}\) |
| 3. | \(\dfrac{3}{2}\) | 4. | \(\dfrac{4}{3}\) |
Subtopic: Â Conduction |
Level 3: 35%-60%
NEET - 2025
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Given below are two statements:
Choose the correct option from the given ones:
| Assertion (A): | Houses made of concrete roofs overlaid with foam keep the room hotter during summer. |
| Reason (R): | The layer of foam insulation prohibits heat transfer, as it contains air pockets. |
Choose the correct option from the given ones:
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | Both (A) and (R) are True and (R) is the correct explanation of (R). |
Subtopic: Â Conduction |
 60%
Level 2: 60%+
NEET - 2024
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Two rods, one made of copper and the other made of steel, of the same length and same cross-sectional area are joined together. The thermal conductivity of copper and steel are \(385~\text{Js}^{-1}\text{K}^{-1}\text{m}^{-1}\) and \(50~\text{Js}^{-1}\text{K}^{-1}\text{m}^{-1}\) respectively. The free ends of copper and steel are held at \(100^\circ \text{C}\) and \(0^\circ \text{C}\) respectively. The temperature at the junction is, nearly:
| 1. | \(12^\circ \text{C}\) | 2. | \(50^\circ \text{C}\) |
| 3. | \(73^\circ \text{C}\) | 4. | \(88.5^\circ \text{C}\) |
Subtopic: Â Conduction |
 74%
Level 2: 60%+
NEET - 2022
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The quantities of heat required to raise the temperature of two solid copper spheres of radii \(r_1\) and \(r_2\) \((r_1=1.5~r_2)\) through \(1~\text{K}\) are in the ratio:
| 1. | \(\dfrac{9}{4}\) | 2. | \(\dfrac{3}{2}\) |
| 3. | \(\dfrac{5}{3}\) | 4. | \(\dfrac{27}{8}\) |
Subtopic: Â Conduction |
 53%
Level 3: 35%-60%
NEET - 2020
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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 \(-26^{\circ}\text{C}\). 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. | \(\dfrac{26k}{x\rho L-4s}\) | 2. | \(\dfrac{26k}{x^2\rho L}\) |
| 3. | \(\dfrac{26k}{x\rho L}\) | 4. | \(\dfrac{26k}{x\rho L+4s}\) |
Subtopic: Â Conduction |
 53%
Level 3: 35%-60%
NEET - 2019
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