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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. \(\sqrt { \dfrac{T}{\rho g}}\)

2. \(\sqrt { \dfrac{2T}{\rho g}}\)

3. \(\sqrt{\dfrac{2T\rho}{\pi g}}\)

4. \(\sqrt{\dfrac{2T} {\pi \rho g}}\)

1. \(\sqrt { \dfrac{T}{\rho g}}\)

2. \(\sqrt { \dfrac{2T}{\rho g}}\)

3. \(\sqrt{\dfrac{2T\rho}{\pi g}}\)

4. \(\sqrt{\dfrac{2T} {\pi \rho g}}\)

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 \(1~\text{atm} = 10^5~\text{Pa}\)]:

[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 |

63%

From NCERT

NEET - 2024

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An ideal fluid is flowing in a non-uniform cross-sectional tube \(XY\) (as shown in the figure) from end \(X\) to end \(Y.\) If \(K_1\) and \(K_2\) are the kinetic energy per unit volume of the fluid at \(X\) and \(Y\) respectively, then the correct option is:

1. \(K_1\text=K_2\)

2. \({2K}_1\text={K}_2\)

3. \({K}_1>{K}_2\)

4. \({K}_1<{K}_2\)

1. \(K_1\text=K_2\)

2. \({2K}_1\text={K}_2\)

3. \({K}_1>{K}_2\)

4. \({K}_1<{K}_2\)

Subtopic: Bernoulli's Theorem |

59%

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 |

82%

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

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

To view explanation, please take trial in the course.

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