- 1(current)
Q. No.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 |
From NCERT
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Given below are two statements:
| Assertion (A): | At room temperature water does not sublimate from ice to steam. |
| Reason (R): | The critical point of water is much above room temperature. |
| 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 |
From NCERT
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Given below are two statements:
| Assertion (A): | Water kept in an open vessel will quickly evaporate on the surface of the moon. |
| Reason (R): | The temperature at the surface of the moon is much higher than the boiling point of water. |
| 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 |
From NCERT
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Given below are two statements:
| Assertion (A): | Evaporation can occur at any temperature, whereas the boiling point of a liquid depends on external pressure. |
| Reason (R): | Evaporation happens from the surface of a liquid at all temperatures, while boiling occurs at a specific temperature determined by external pressure. |
| 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 |
83%
From NCERT
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Two different liquids of the same mass are kept in two identical vessels which are placed in a freezer that extracts heat from them at the same rate causing each liquid to transform into a solid. The schematic figure below shows the temperature \(T\) versus time \(t\) plot for the two materials. We denote the specific heat in the liquid states to be \(C_{L_1}\) and \(C_{L_2}\) for materials \(1\) and \(2\) respectively and latent heats of fusion \(U_1\) and \(U_2\) respectively.
Choose the correct option:
| 1. | \(C_{L_1}>C_{L_2}~\text{and }U_1<U_2\) |
| 2. | \(C_{L_2}>C_{L_1}~\text{and }U_1<U_2\) |
| 3. | \(C_{L_1}<C_{L_2}~\text{and }U_1>U_2\) |
| 4. | \(C_{L_1}<C_{L_2}~\text{and }U_1<U_2\) |
Subtopic: Calorimetry |
53%
From NCERT
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In the adjoining figure, various isothermals are shown for a real gas. Then:
| 1. | \(EF\) represents liquification |
| 2. | \(CB\) represents liquification |
| 3. | \(HI\) represents the critical temperature |
| 4. | \(AB\) represents gas at a high temperature |
Subtopic: Calorimetry |
52%
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Hints
Liquid oxygen at \(50~\text K\) is heated up to \(300~\text K\) at a constant pressure of \(1~\text{atm}.\) The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Calorimetry |
82%
From NCERT
AIPMT - 2012
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A substance is in solid form at \(0^{\circ}\mathrm{C}\). The amount of heat added to this substance and its temperature are plotted in the following graph. If the relative specific heat capacity of the solid substance is 0.5, from the graph, the specific latent heat of the melting process is: (Specific heat capacity of water = 1000 cal kg-1 K-1 )
| 1. | 60000 cal kg-1 | 2. | 40000 cal kg-1 |
| 3. | 10000 cal kg-1 | 4. | 20000 cal kg-1 |
Subtopic: Calorimetry |
64%
From NCERT
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- 1(current)
Q. No.
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