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Q. No.A liquid can easily change its shape but a solid can not because:
1.
the density of a liquid is smaller than that of a solid.
2.
the forces between the molecules is stronger in solid than in liquids.
3.
the atoms combine to form bigger molecules in a solid.
4.
the average separation between the molecules is larger in solids.
Subtopic: Properties of Fluids |
90%
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Given below are two statements:
| Assertion (A): | Water flows through a smooth horizontal tube with a narrowing cross-section and its pressure increases. |
| Reason (R): | Bernoulli's equation for fluids states that \(P+\dfrac{1}{2}\rho v^2+\rho gh= \) constant along a streamline. |
| 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. | (A) is False but (R) is True. |
Subtopic: Bernoulli's Theorem |
61%
From NCERT
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Choose the incorrect statement:
| 1. | Soap bubbles have two air-liquid interfaces. |
| 2. | Liquid drops have one air-liquid interface. |
| 3. | Air cavity inside a liquid has one air-liquid interface. |
| 4. | Air cavity inside a liquid has two air-liquid interfaces. |
Subtopic: Surface Tension |
74%
From NCERT
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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%
From NCERT
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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 |
From NCERT
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A long capillary tube with a radius of \(1\) mm, open at both ends, is filled with water and placed vertically. What will be the height of the column of water left in the capillary? The thickness of the capillary walls is negligible, and the surface tension of water is \(70\) dyne/cm.
1. \(2.5~\text{cm}\)
2. \(2.8~\text{cm}\)
3. \(3.0~\text{cm}\)
4. \(3.2~\text{cm}\)
1. \(2.5~\text{cm}\)
2. \(2.8~\text{cm}\)
3. \(3.0~\text{cm}\)
4. \(3.2~\text{cm}\)
Subtopic: Capillary Rise |
76%
From NCERT
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A small sphere of density \(\rho\) is completely submerged in a liquid of density \(3\rho\) and released. The magnitude of its acceleration just after release equals:
1. \(g\)
2. \(\dfrac{g}{3}\)
3. \(2g\)
4. \(3g\)
1. \(g\)
2. \(\dfrac{g}{3}\)
3. \(2g\)
4. \(3g\)
Subtopic: Archimedes' Principle |
62%
From NCERT
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When water flows out of a small hole at the bottom of a large tank of uniform cross-section, the average flow rate equals the average of the initial and the final flow rate. The time to empty the tank is \(1~\text{hr},\) using a small pipe at the bottom. If the tank were to be filled to twice its previous level, the time required will be:
1. \(1~\text{hr}\)
2. \(\sqrt2~\text{hr}\)
3. \(2~\text{hr}\)
4. \(4~\text{hr}\)
1. \(1~\text{hr}\)
2. \(\sqrt2~\text{hr}\)
3. \(2~\text{hr}\)
4. \(4~\text{hr}\)
Subtopic: Bernoulli's Theorem |
74%
From NCERT
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A tank full of water is placed in an elevator. The elevator accelerates upward. The water pressure at the bottom of the tank:
1. decreases
2. increases
3. remains unchanged
4. first increases and then decreases
1. decreases
2. increases
3. remains unchanged
4. first increases and then decreases
Subtopic: Pressure |
78%
From NCERT
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If a soap bubble expands, the pressure inside the bubble:
1. is equal to the atmospheric pressure
2. decreases
3. increases
4. remains the same
1. is equal to the atmospheric pressure
2. decreases
3. increases
4. remains the same
Subtopic: Surface Tension |
70%
From NCERT
NEET - 2022
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