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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%

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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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The terminal velocity of a copper ball of radius \(5~\text{mm}\) falling through a tank of oil at room temperature is \(10~\text{cm}~\text{s}^{-1}\) . If the viscosity of oil at room temperature is \(0.9~\text{kg}~\text{m}^{-1}~\text{s}^{-1}\), the viscous drag force is:

1. \(8.48 \times10^{-3}\) N

2. \(8.48 \times10^{-5}\) N

3. \(4.23 \times10^{-3}\) N

4. \(4.23 \times10^{-6}\) N

1. \(8.48 \times10^{-3}\) N

2. \(8.48 \times10^{-5}\) N

3. \(4.23 \times10^{-3}\) N

4. \(4.23 \times10^{-6}\) N

Subtopic: Stokes' Law |

64%

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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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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%

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NEET - 2022

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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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