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Q. No.The temperature at which the Celsius and Fahrenheit thermometers agree (to give the same numerical value) is:
1.
\(-40^\circ\)
2.
\(40^\circ\)
3.
\(0^\circ\)
4.
\(50^\circ\)
Subtopic: Temperature and Heat |
86%
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Two spheres \(A\) and \(B\) of same material having radius \(8\) cm and \(4\) cm are maintained at temperatures \(127^{\circ}\text{C}\) and \(527^{\circ}\text{C}\) respectively. The ratio of energy radiated by \(A\) and \(B\) is:
1. \(1:4\)
2. \(3:1\)
3. \(1:2\)
4. \(6:1\)
1. \(1:4\)
2. \(3:1\)
3. \(1:2\)
4. \(6:1\)
Subtopic: Stefan-Boltzmann Law |
84%
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Which of the curves in the figure represents the relation between Celsius and Fahrenheit temperature?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Temperature and Heat |
72%
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A liquid \(P\) of mass \(M\) and specific heat capacity \(S\) is at temperature \(2T.\) If another liquid \(Q\) of specific heat capacity \(1.5\) times liquid \(P\) at a temperature of \(\dfrac{T}{3}\) is added to it, the resultant temperature will be:
| 1. | \(\dfrac{4T}{5}\) | 2. | \(T\) |
| 3. | \(\dfrac{T}{2}\) | 4. | \(\dfrac{5T}{4}\) |
Subtopic: Calorimetry |
77%
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A radiation blackbody has the shape of a sphere of radius \(r.\) Its surface is at a temperature \(T\) (in Kelvin). If the temperature is doubled and the radius is halved, the total rate of radiation emitted from the body:
| 1. | increases by a factor of \(4\) |
| 2. | increases by a factor of \(2\) |
| 3. | remains unchanged |
| 4. | decreases by a factor of \(2\) |
Subtopic: Stefan-Boltzmann Law |
82%
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Given below are two statements:
| Assertion (A): | In a pressure cooker the water is brought to a boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again. |
| Reason (R): | The impurities in water bring down its boiling point. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Calorimetry |
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The presence of a gravitational field is required for the heat transfer by:
1. radiation
2. conduction
3. stirring of liquids
4. natural convection
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%
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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%
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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%
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