361199
Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
At critical temperature \(\left(t_{c}{ }^{\circ} C\right)\), the intermolecular forces for liquids and gases become equal, allowing the liquid to expand without any restriction. Surface tension \(T_{s}\) varies as shown So correct option is (1).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361200
Assertion : A mercury barometer always reads less than the actual pressure. Reason : The density of liquid varies with the rise of temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Assertion is correct. Because of 'surface tension', mercury in tube gets depressed. Volume expands with rise in temperature. \(\Rightarrow\) Density varies. 'Reason' is different fact. So correct option is (2).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361201
Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
As temperature increases surface tension decreases. The soap solution has lower surface tension compared to regular water, and its surface tension decreases further when heated. Consequently, hot soap solution can spread over a larger surface area and exhibits increased wetting power. This property allows hot soap solution to penetrate and clean clothes more effectively than ordinary water. So correct option is (4).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361202
Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension occurs for gases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Liquids form definite surface. Gases do not have surface. The intermolecular distance among gas molecules is considerably greater than that among liquid molecules. Consequently, the cohesive forces among gas molecules are very weak, whereas they are much stronger in liquids. Hence, the concept of surface tension applies to liquids but not to gases. So correct option is (3).
361199
Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
At critical temperature \(\left(t_{c}{ }^{\circ} C\right)\), the intermolecular forces for liquids and gases become equal, allowing the liquid to expand without any restriction. Surface tension \(T_{s}\) varies as shown So correct option is (1).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361200
Assertion : A mercury barometer always reads less than the actual pressure. Reason : The density of liquid varies with the rise of temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Assertion is correct. Because of 'surface tension', mercury in tube gets depressed. Volume expands with rise in temperature. \(\Rightarrow\) Density varies. 'Reason' is different fact. So correct option is (2).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361201
Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
As temperature increases surface tension decreases. The soap solution has lower surface tension compared to regular water, and its surface tension decreases further when heated. Consequently, hot soap solution can spread over a larger surface area and exhibits increased wetting power. This property allows hot soap solution to penetrate and clean clothes more effectively than ordinary water. So correct option is (4).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361202
Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension occurs for gases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Liquids form definite surface. Gases do not have surface. The intermolecular distance among gas molecules is considerably greater than that among liquid molecules. Consequently, the cohesive forces among gas molecules are very weak, whereas they are much stronger in liquids. Hence, the concept of surface tension applies to liquids but not to gases. So correct option is (3).
361199
Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
At critical temperature \(\left(t_{c}{ }^{\circ} C\right)\), the intermolecular forces for liquids and gases become equal, allowing the liquid to expand without any restriction. Surface tension \(T_{s}\) varies as shown So correct option is (1).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361200
Assertion : A mercury barometer always reads less than the actual pressure. Reason : The density of liquid varies with the rise of temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Assertion is correct. Because of 'surface tension', mercury in tube gets depressed. Volume expands with rise in temperature. \(\Rightarrow\) Density varies. 'Reason' is different fact. So correct option is (2).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361201
Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
As temperature increases surface tension decreases. The soap solution has lower surface tension compared to regular water, and its surface tension decreases further when heated. Consequently, hot soap solution can spread over a larger surface area and exhibits increased wetting power. This property allows hot soap solution to penetrate and clean clothes more effectively than ordinary water. So correct option is (4).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361202
Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension occurs for gases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Liquids form definite surface. Gases do not have surface. The intermolecular distance among gas molecules is considerably greater than that among liquid molecules. Consequently, the cohesive forces among gas molecules are very weak, whereas they are much stronger in liquids. Hence, the concept of surface tension applies to liquids but not to gases. So correct option is (3).
361199
Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
At critical temperature \(\left(t_{c}{ }^{\circ} C\right)\), the intermolecular forces for liquids and gases become equal, allowing the liquid to expand without any restriction. Surface tension \(T_{s}\) varies as shown So correct option is (1).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361200
Assertion : A mercury barometer always reads less than the actual pressure. Reason : The density of liquid varies with the rise of temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Assertion is correct. Because of 'surface tension', mercury in tube gets depressed. Volume expands with rise in temperature. \(\Rightarrow\) Density varies. 'Reason' is different fact. So correct option is (2).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361201
Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
As temperature increases surface tension decreases. The soap solution has lower surface tension compared to regular water, and its surface tension decreases further when heated. Consequently, hot soap solution can spread over a larger surface area and exhibits increased wetting power. This property allows hot soap solution to penetrate and clean clothes more effectively than ordinary water. So correct option is (4).
PHXI10:MECHANICAL PROPERTIES OF FLUIDS
361202
Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension occurs for gases.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Liquids form definite surface. Gases do not have surface. The intermolecular distance among gas molecules is considerably greater than that among liquid molecules. Consequently, the cohesive forces among gas molecules are very weak, whereas they are much stronger in liquids. Hence, the concept of surface tension applies to liquids but not to gases. So correct option is (3).
