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Q. No.The presence of a gravitational field is required for the heat transfer by:
1. radiation
2. conduction
3. stirring of liquids
4. natural convection
Subtopic: Convection |
77%
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Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at \(0^\circ \text{C}\) and \(90^\circ \text{C}\) respectively. The temperature of the junction of the three rods will be:
| 1. | \(45^\circ \text{C}\) | 2. | \(60^\circ \text{C}\) |
| 3. | \(30^\circ \text{C}\) | 4. | \(20^\circ \text{C}\) |
Subtopic: Conduction |
87%
From NCERT
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Select the correct option based on the statements given below:
| Statement I: | A solid and hollow sphere of the same diameter and same material, when heated through the same temperature, will expand by the same amount. |
| Statement II: | The change in volume is independent of the original mass but depends on the original volume. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Thermal Expansion |
70%
From NCERT
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Which of the following law states that \(\lambda_{m}\) is inversely proportional to absolute temperature?
(where \(\lambda_{m}\) is the wavelength at which maximum energy is emitted)
1. Stefan’s law
2. Rayleigh-Jeans law
3. Maxwell-Boltzmann law
4. Wien’s displacement law
(where \(\lambda_{m}\) is the wavelength at which maximum energy is emitted)
1. Stefan’s law
2. Rayleigh-Jeans law
3. Maxwell-Boltzmann law
4. Wien’s displacement law
Subtopic: Wien's Displacement Law |
86%
From NCERT
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Three rods of identical dimensions but made of materials of conductivities \(K,~2K,~K\) are connected in series. The two ends \(A~,B\) are maintained at temperatures of \(0^{\circ} \text{C},~100^{\circ} \text{C}\) respectively. Assume no loss of heat from the sides. The temperatures of the junctions \(X,~Y\) are:
1. \(25^\circ\text C,~75^\circ\text C\)
2. \(40^\circ\text C,~60^\circ\text C\)
3. \(20^\circ\text C,~80^\circ\text C\)
4. \(30^\circ\text C,~70^\circ\text C\)
1. \(25^\circ\text C,~75^\circ\text C\)
2. \(40^\circ\text C,~60^\circ\text C\)
3. \(20^\circ\text C,~80^\circ\text C\)
4. \(30^\circ\text C,~70^\circ\text C\)
Subtopic: Conduction |
69%
From NCERT
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A beaker contains \(1000\) g of a liquid that is stirred at its boiling point. A \(100\) W electric heater is completely immersed in the liquid. The heater provides the liquid with thermal energy, and \(200\) g of the liquid changes to vapour in \(1600\) s.
What is the specific latent heat of evaporation of the liquid?
(Assume that no thermal energy is transferred to or from the surroundings, and no vapour condenses.)
1. \(12.5\) J/g
2. \(160\) J/g
3. \(3200\) J/g
4. \(800\) J/g
What is the specific latent heat of evaporation of the liquid?
(Assume that no thermal energy is transferred to or from the surroundings, and no vapour condenses.)
1. \(12.5\) J/g
2. \(160\) J/g
3. \(3200\) J/g
4. \(800\) J/g
Subtopic: Calorimetry |
79%
From NCERT
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Two rods \(A\) and \(B\) having the same length of \(1\) m are at the same temperature \(30^\circ \text{C}.\) The coefficients of linear expansion of \(A\) and \(B\) are in the ratio \(4:3.\) At what temperature will the length of \(B\) be the same as the length of rod \(A\) at \(180^\circ \text{C}\)?
| 1. | \(200^\circ \text{C}\) | 2. | \(230^\circ \text{C}\) |
| 3. | \(250^\circ \text{C}\) | 4. | \(270^\circ \text{C}\) |
Subtopic: Thermal Expansion |
79%
From NCERT
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A \(100\) g of iron nail is hit by a \(1.5\) kg hammer striking at a velocity of \(60\) ms–1. What will be the rise in the temperature of the nail if one-fourth of the energy of the hammer goes into heating the nail?
[Specific heat capacity of iron = \(0.42\) Jg–1 °C–1]
[Specific heat capacity of iron = \(0.42\) Jg–1 °C–1]
| 1. | \(675\)°C | 2. | \(1600\)°C |
| 3. | \(16.07\)°C | 4. | \(6.75\)°C |
Subtopic: Temperature and Heat |
65%
From NCERT
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In an experiment to verify Newton's law of cooling, a graph is plotted between the temperature difference \((\Delta T)\) of the water and surroundings and time as shown in the figure. The initial temperature of the water is taken as \(80^\circ\text C.\) The value of \(t_2\) as mentioned in the graph will be:
| 1. | \(12\) | 2. | \(14\) |
| 3. | \(16\) | 4. | \(18\) |
Subtopic: Newton's Law of Cooling |
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Given that the coefficient of linear expansion of brass is \(\alpha=0.00002^\circ \text{C}^{-1},\) what rise in temperature is required to increase the length of a brass rod by \(1\text{%} \text{?}\)
1. \(750^\circ \text{C}\)
2. \(500^\circ \text{C}\)
3. \(200^\circ \text{C}\)
4. \(100^\circ \text{C}\)
1. \(750^\circ \text{C}\)
2. \(500^\circ \text{C}\)
3. \(200^\circ \text{C}\)
4. \(100^\circ \text{C}\)
Subtopic: Thermal Expansion |
86%
From NCERT
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