A vessel containing water is heated from the top by means of a heater, just above the water surface. Assume that the temperature of the water was just above $$0^\circ\mathrm{ C},$$ in the beginning. The temperature $$(\theta_A)$$ at the bottom is measured as a function of time. Which of the following shows the correct plot?                                               1. a 2. b 3. c 4. d

Subtopic:  Convection |
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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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Given below are two statements:
 Assertion (A): A body that is a good radiator is also a good absorber of radiation at a given wavelength. Reason (R): According to Kirchhoff's law, the absorptivity of a body is equal to its emissivity at a given wavelength.

 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.

77%
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Given below are two statements:
 Assertion (A): With rise in temperature, time period of a pendulum remains same. Reason (R): Time period is not dependent on 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:  Thermal Expansion |
83%
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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 |
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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 |
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Given below are two statements:
 Assertion (A): If you decrease or increase the temperature of the water below or above 4°C respectively, its volume increases. Reason (R): Density of water is maximum at 4°C.

 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:  Thermal Expansion |
69%
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Given below are two statements:
 Assertion (A): The emissive power of a body at a temperature T (in K) is directly proportional to T4. Reason (R): Good emissive power of a body means the body is a good radiator.

 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.

70%
From NCERT
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Given below are two statements:
 Assertion (A): Material used for making cooking utensils is the one having high specific heat and high conductivity. Reason (R): Low conductivity means high specific heat.

 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:  Conduction |
59%
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Given below are two statements:
 Assertion (A): Evaporation occurs at any temperature whereas the boiling point depends on the external pressure. Reason (R): Evaporation of a liquid occurs from the surface of a liquid at all temperatures whereas boiling takes place at a temperature determined by the 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%
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