- 1(current)
Q. No.The platelets are drifting with the blood flowing in a streamlined flow through a horizontal artery as shown below. The artery is contracted in Region II.
Choose the correct statement.
Choose the correct statement.
| 1. | As the platelets enter a constriction, the platelets get squeezed closer together in the narrow region and hence the fluid pressure must rise there. |
| 2. | As the platelets enter a constriction, pressure is lower there. |
| 3. | The artery's cross-section area is smaller in the constriction and thus the pressure must be larger there because pressure equals the force divided by area. |
| 4. | The pressure is the same in all the parts of the artery. |
Subtopic: Â Bernoulli's Theorem |
From NCERT
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Hints
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Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of a narrow cross-section. In this region the bubbles:
| 1. | move with greater speed and are smaller than in the rest of the pipe. |
| 2. | move with greater speed and are larger in size than in the rest of the pipe. |
| 3. | move with lesser speed and are smaller than in the rest of the pipe. |
| 4. | move with lesser speed and are of the same size as in the rest of the pipe. |
Subtopic: Â Bernoulli's Theorem |
From NCERT
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A liquid of density \(\rho\) is forced out through a small hole by means of a piston of cross-section 'A', on which a force \(F\) is applied. The flow is streamline. The liquid stream strikes the ground at a distance '\(x\)' in front of the hole. The hole is in the middle of the right face and its height is '\(h\)' above the ground. The expression for \(x^2\) is:
| 1. | \(\dfrac{4 F h}{A \rho g}\) | 2. | \(\dfrac{2 F h}{A \rho g}\) |
| 3. | \(\dfrac{F h}{A \rho g}\) | 4. | \(\dfrac{F h}{2 A \rho g}\) |
Subtopic: Â Bernoulli's Theorem |
 53%
From NCERT
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Water flows from a small hole at the bottom of a rectangular tank at \(10\) m/s after it had been filled for \(20\) min. For how much time should the empty tank be filled at the same rate so that the speed of efflux is doubled? (i.e. it becomes \(20\) m/s)
1. \(40\) min
2. \(80\) min
3. \(160\) min
4. \(320\) min
1. \(40\) min
2. \(80\) min
3. \(160\) min
4. \(320\) min
Subtopic: Â Bernoulli's Theorem |
 54%
From NCERT
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Q. No.
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