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A liquid does not wet the solid surface if the angle of contact is:

1. equal to $\mathrm{}$\(45^{\circ}\)

2. equal to \(60^{\circ}\)$\mathrm{}$

3. greater then \(90^{\circ}\)$\mathrm{}$

4. zero

Subtopic: Surface Tension |

77%

From NCERT

NEET - 2020

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A barometer is constructed using a liquid (density = \(760~\text{kg/m}^3\)). What would be the height of the liquid column, when a mercury barometer reads \(76\) cm?

(density of mercury = \(13600~\text{kg/m}^3\))

1. | \(1.36\) m | 2. | \(13.6\) m |

3. | \(136\) m | 4. | \(0.76\) m |

Subtopic: Pressure |

78%

From NCERT

NEET - 2020

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The velocity of a small ball of mass \(M\) and density \(d\), when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(d\over 2\) then the viscous force acting on the ball will be:

1. | \(\frac{3Mg}{2}\) | 2. | \(2Mg\) |

3. | \(\frac{Mg}{2}\) | 4. | \(Mg\) |

Subtopic: Viscosity |

60%

From NCERT

NEET - 2021

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A capillary tube of radius \(r\) is immersed in water and water rises in it to a height \(h.\) The mass of the water in the capillary is \(5\) g. Another capillary tube of radius \(2r\) is immersed in water. The mass of water that will rise in this tube is:

1. \(5.0\) g

2. \(10.0\) g

3. \(20.0\) g

4. \(2.5\) g

Subtopic: Capillary Rise |

61%

From NCERT

NEET - 2020

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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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A fluid of density \(\rho~\)is flowing in a pipe of varying cross-sectional area as shown in the figure. Bernoulli's equation for the motion becomes:

1. \(p+\frac12\rho v^2+\rho gh\text{=constant}\)

2. \(p+\frac12\rho v^2\text{=constant}\)

3. \(\frac12\rho v^2+\rho gh\text{=constant}\)

4. \(p+\rho gh\text{=constant}\)

Subtopic: Bernoulli's Theorem |

88%

From NCERT

NEET - 2022

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Air is pushed carefully into a soap bubble of radius \(r\) to double its radius. If the surface tension of the soap solution is \(T,\) then work done in the process is:

1. | \(12\pi r^2T\) | 2. | \(24\pi r^2T\) |

3. | \(4\pi r^2T\) | 4. | \(8\pi r^2T\) |

Subtopic: Surface Tension |

60%

From NCERT

NEET - 2022

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Two copper vessels \(A\) and \(B\) have the same base area but are of different shapes. \(A\) takes twice the volume of water that \(B\) requires to fill up to a particular common height. Then the correct statement among the following is:

1. pressure on the base area of vessels \(A\) and \(B\) is same.

2. pressure on the base area of vessels \(A\) and \(B\) is not same.

3. both vessels \(A\) and \(B\) weigh the same.

4. vessel \(B\) weighs twice that of \(A\).

1. pressure on the base area of vessels \(A\) and \(B\) is same.

2. pressure on the base area of vessels \(A\) and \(B\) is not same.

3. both vessels \(A\) and \(B\) weigh the same.

4. vessel \(B\) weighs twice that of \(A\).

Subtopic: Pressure |

68%

From NCERT

NEET - 2022

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