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Q. No.Consider a mercury-filled tube as shown in the figure below.
Which of the following options about the pressures at the lettered locations (\({A},\) \({B},\) \({C},\) \({D}\)) is true?
1. \(P_{B}>P_{A}>P_{C}>P_{D}\)
2. \(P_{B}=P_{C}=P_{D}>P_{A}\)
3. \(P_{B}=P_{C}=P_{D}<P_{A}\)
4. \(P_{A}=P_{B}=P_{C}=P_{D}\)
Which of the following options about the pressures at the lettered locations (\({A},\) \({B},\) \({C},\) \({D}\)) is true?
1. \(P_{B}>P_{A}>P_{C}>P_{D}\)
2. \(P_{B}=P_{C}=P_{D}>P_{A}\)
3. \(P_{B}=P_{C}=P_{D}<P_{A}\)
4. \(P_{A}=P_{B}=P_{C}=P_{D}\)
Subtopic: Pressure |
71%
Level 2: 60%+
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Streamline flow is more likely for liquids with
| (a) | high density. | (b) | high viscosity. |
| (c) | low density. | (d) | low viscosity. |
Choose the correct option:
| 1. | (a), (b) | 2. | (c), (d) |
| 3. | (b), (c) | 4. | (a), (d) |
Subtopic: Types of Flows |
Level 3: 35%-60%
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A boat carrying a number of large stones is floating in a water tank. What will happen to the water level if the stones are unloaded into the water?
| 1. | the water level remains unchanged. |
| 2. | the water level falls. |
| 3. | the water level rises. |
| 4. | the water level rises till half the number of stones are unloaded and then begins to fall. |
Subtopic: Properties of Fluids |
60%
Level 2: 60%+
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Given below are two statements:
| Statement I: | Two bodies of different masses, shapes, and sizes may experience the same thrust when their volumes inside a fluid are equal. |
| Statement II: | A soft plastic bag weighs the same when empty or when filled with air at atmospheric pressure. |
| 1. | Only Statement I is True. |
| 2. | Only Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: Archimedes' Principle |
60%
Level 2: 60%+
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The fluid is in streamlined flow through a horizontal pipe with a variable cross-sectional area. Which of the following statements is correct?
| 1. | The velocity is maximum at the narrowest part of the pipe, and pressure is maximum at the widest part of the pipe. |
| 2. | Both the velocity and pressure are maximum at the narrowest part of the pipe. |
| 3. | Both the velocity and pressure are maximum at the widest part of the pipe. |
| 4. | The velocity is minimum at the narrowest part of the pipe, and the pressure is minimum at the widest part of the pipe. |
Subtopic: Equation of Continuity |
69%
Level 2: 60%+
NEET - 2013
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A horizontal pipe is shown in the figure. The velocity of water at point \(A\) is \(20\) cm/s, and at point \(B,\) it is \(30\) cm/s. Given that the density of water is \(1000\) kg/m3. The pressure difference between points \(A\) and \(B\) is:
| 1. | \(50\) Pa | 2. | \(40\) Pa |
| 3. | \(25\) Pa | 4. | \(0.5\) Pa |
Subtopic: Bernoulli's Theorem |
80%
Level 1: 80%+
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The correct statement about the variation of viscosity of fluids with an increase in temperature is:
| 1. | viscosity of gases decreases. |
| 2. | viscosity of both liquids and gases increases. |
| 3. | viscosity of liquids increases. |
| 4. | viscosity of liquids decreases. |
Subtopic: Viscosity |
76%
Level 2: 60%+
NEET - 2022
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A steel ball is dropped in a viscous liquid. The distance-time graph of the steel ball in the liquid is shown below. The terminal velocity of the ball is closest to:
1. \(0.26~\text{m/s} \)
2. \(0.33~\text{m/s} \)
3. \(0.45~\text{m/s} \)
4. \(0.21~\text{m/s} \)
1. \(0.26~\text{m/s} \)
2. \(0.33~\text{m/s} \)
3. \(0.45~\text{m/s} \)
4. \(0.21~\text{m/s} \)
Subtopic: Stokes' Law |
Level 3: 35%-60%
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The radius of a soap bubble is \(R.\) The surface tension of the soap solution is \(T,\) if the radius of the soap bubble is increased to \(3R\) then the energy required is:
(consider no loss anywhere)
1. \(64\pi R^{2}T\)
2. \(9\pi R^{2}T\)
3. \(32\pi R^{2}T\)
4. \(72\pi R^{2}T\)
(consider no loss anywhere)
1. \(64\pi R^{2}T\)
2. \(9\pi R^{2}T\)
3. \(32\pi R^{2}T\)
4. \(72\pi R^{2}T\)
Subtopic: Surface Tension |
65%
Level 2: 60%+
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In a vertical capillary of height \(3h,\) water rises upto height \(h.\) If the capillary is tilted at \(30^\circ\) with horizontal, then the height upto which water will rise becomes:
1. \(3h\)
2. \(2h\)
3. \(h\)
4. \(\dfrac {3h} 2\)
1. \(3h\)
2. \(2h\)
3. \(h\)
4. \(\dfrac {3h} 2\)
Subtopic: Capillary Rise |
Level 4: Below 35%
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