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Q. No.A thin flat circular disc of radius \(4.5~\text {cm}\) is placed gently over the surface of water. If surface tension of water is \(0.07~\text{Nm}^{-1},\) then the excess force required to take it away from the surface is:
1. \(198~\text{N}\)
2. \(1.98~\text{mN}\)
3. \(99~\text{N}\)
4. \(19.8~\text{mN}\)
1. \(198~\text{N}\)
2. \(1.98~\text{mN}\)
3. \(99~\text{N}\)
4. \(19.8~\text{mN}\)
Subtopic: Surface Tension |
From NCERT
NEET - 2024
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A wire of length \(L\) and radius \(r(r<<L)\) is kept floating on the surface of a liquid of density \(\rho\). The maximum radius of the wire for which it may not sink is (Surface tension of liquid is \(T\)):
1. \(\sqrt { \frac{T}{\rho g}}\)
2. \(\sqrt { \frac{2T}{\rho g}}\)
3. \(\sqrt{\frac{2T\rho}{\pi g}}\)
4. \(\sqrt{\frac{2T} {\pi \rho g}}\)
1. \(\sqrt { \frac{T}{\rho g}}\)
2. \(\sqrt { \frac{2T}{\rho g}}\)
3. \(\sqrt{\frac{2T\rho}{\pi g}}\)
4. \(\sqrt{\frac{2T} {\pi \rho g}}\)
Subtopic: Surface Tension |
52%
From NCERT
NEET - 2024
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The pressure experienced by a swimmer \(20~\text{m}\) below the water surface in a lake is appropriately
[Given density of water = \(10^3 ~\text{kgm}^{-3}, g=10 ~\text{ms}^{-2} \) and \(1~\text{atm} = 10^5~\text{Pa}\)]:
1. \(1~\text{atm}\)
2. \(2~\text{atm}\)
3. \(3~\text{atm}\)
4. \(4~\text{atm}\)
[Given density of water = \(10^3 ~\text{kgm}^{-3}, g=10 ~\text{ms}^{-2} \) and \(1~\text{atm} = 10^5~\text{Pa}\)]:
1. \(1~\text{atm}\)
2. \(2~\text{atm}\)
3. \(3~\text{atm}\)
4. \(4~\text{atm}\)
Subtopic: Pressure |
61%
From NCERT
NEET - 2024
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The venturi-meter works on:
| 1. | The principle of perpendicular axes |
| 2. | Huygen's principle |
| 3. | Bernoulli's principle |
| 4. | The principle of parallel axes |
Subtopic: Bernoulli's Theorem |
81%
From NCERT
NEET - 2023
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The amount of energy required to form a soap bubble of radius \(2~\text{cm}\) from a soap solution is nearly:
\((\)surface tension of soap solution \(0.03~\text{Nm}^{-1})\)
1. \(50.1 \times 10^{-4}~\text{J}\)
2. \(30.16 \times 10^{-4}~ \text{J}\)
3. \(5.06 \times 10^{-4} ~\text{J}\)
4. \(3.01\times 10^{-4} ~\text{J}\)
\((\)surface tension of soap solution \(0.03~\text{Nm}^{-1})\)
1. \(50.1 \times 10^{-4}~\text{J}\)
2. \(30.16 \times 10^{-4}~ \text{J}\)
3. \(5.06 \times 10^{-4} ~\text{J}\)
4. \(3.01\times 10^{-4} ~\text{J}\)
Subtopic: Surface Tension |
58%
From NCERT
NEET - 2023
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Which of the following statements is not true?
| 1. | The coefficient of viscosity is a scalar quantity. |
| 2. | Surface tension is a scalar quantity. |
| 3. | Pressure is a vector quantity. |
| 4. | Relative density is a scalar quantity. |
Subtopic: Pressure |
68%
From NCERT
NEET - 2023
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The viscous drag acting on a metal sphere of diameter \(1\) mm, falling through a fluid of viscosity \(0.8\) Pa-s with a velocity of \(2\) ms–1 is nearly equal to:
1. \(15\times 10^{-3}~\text{N}\)
2. \(30\times 10^{-3}~\text{N}\)
3. \(1.5\times 10^{-3}~\text{N}\)
4. \(20\times 10^{-3}~\text{N}\)
1. \(15\times 10^{-3}~\text{N}\)
2. \(30\times 10^{-3}~\text{N}\)
3. \(1.5\times 10^{-3}~\text{N}\)
4. \(20\times 10^{-3}~\text{N}\)
Subtopic: Stokes' Law |
59%
From NCERT
NEET - 2023
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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 |
Subtopic: Surface Tension |
68%
From NCERT
NEET - 2022
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A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (\(v\)) as a function of time (\(t\)) is:
1. \(D\)
2. \(A\)
3. \(B\)
4. \(C\)
1. \(D\)
2. \(A\)
3. \(B\)
4. \(C\)
Subtopic: Viscosity |
71%
From NCERT
NEET - 2022
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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 |
73%
From NCERT
NEET - 2022
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