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Q. No.Given below are two statements:
Assertion (A):
For Reynold number \(R_{e}>3000,\) the flow of fluid is turbulent.
Reason (R):
Inertial forces are dominant compared to viscous forces at such high Reynold's numbers.
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: Â Types of Flows |
 77%
From NCERT
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Given below are two statements:
| Assertion (A): | The equation of continuity is \(A_{1}v_{1}\rho_1=\)\(A_{2}v_{2}\rho_2\) (symbols have their usual meanings). |
| Reason (R): | The equation of continuity is valid only for incompressible liquids. |
| 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: Â Equation of Continuity |
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Given below are two statements:
| Assertion (A): | Atomizer is based on the principle of Bernoulli's theorem. |
| Reason (R): | Bernoulli's theorem is based on the conservation of energy. |
| 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: Â Bernoulli's Theorem |
 60%
From NCERT
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Given below are two statements:
| Assertion (A): | Excess pressure inside a soap bubble is \(4T\over r\) (symbols have their usual meanings). |
| Reason (R): | In a soap bubble, surface tension force counterbalances the force due to excess 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: Â Surface Tension |
 58%
From NCERT
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Given below are two statements:
| Assertion (A): | When a drop breaks apart into smaller drops, the temperature of the drop decreases. |
| Reason (R): | The surface energy of the drop increases at the cost of internal energy. |
| 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: Â Surface Tension |
 71%
From NCERT
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Given below are two statements:
| Assertion (A): | A liquid may neither rise nor fall in a capillary tube. |
| Reason (R): | This is possible if and only if the surface tension is zero. |
| 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: Â Capillary Rise |
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Given below are two statements:
| Assertion (A): | A scuba diver inhales enough air from his oxygen tank to fully expand his lungs while at bottom of the swimming pool. During his ascent towards the water's surface, if he does not exhale, he suffers heart failure. |
| Reason (R): | As he ascends, the air pressure in the lungs causes rupture of the lungs. |
| 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: Â Pressure |
 80%
From NCERT
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Given below are two statements:
| Assertion (A): | Specific gravity of a fluid is a dimensionless quantity. |
| Reason (R): | It is the ratio of the density of the fluid to the density 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: Â Properties of Fluids |
 90%
From NCERT
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Given below are two statements:
| Assertion (A): | When a capillary tube is dipped into mercury, the mercury level in the tube falls. |
| Reason (R): | Mercury is a very viscous liquid. |
| 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: Â Capillary Rise |
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Given below are two statements:
| Assertion (A): | A hydrogen-filled balloon stops rising after it has attained a certain height in the sky. |
| Reason (R): | The atmospheric pressure decreases with height and becomes zero when maximum height is attained. |
| 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: Â Archimedes' Principle |
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