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An airplane of a total wing area of \(120\) ${\mathrm{m}}^{2}$ is in a level flight at some height. If the pressure difference between the upper and lower surface is \(2.5\) kPa, then the mass of the airplane is: (Take \(g=10\) ${\mathrm{ms}}^{-2}$)

1. | \(2\times10^3\) kg | 2. | \(3\times10^4\) kg |

3. | \(5\times10^4\) kg | 4. | \(7\times10^4\) kg |

Subtopic: Pressure |

84%

From NCERT

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A liquid is poured into three vessels of the same base area and equal heights as shown in the figure, then:

1. | Maximum force on the base will be for vessel C |

2. | Maximum force on the base will be for vessel B |

3. | Maximum force on the base will be for vessel A |

4. | Force on the base will be equal for all the vessels |

Subtopic: Pressure |

82%

From NCERT

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The area of cross-section of the wider tube shown in the figure is $800$ ${\mathrm{cm}}^{2}.$ If a mass of 12 kg is placed on the massless piston, then the difference in heights h of the levels of water in the two tubes will be:

1. | 10 cm | 2. | 6 cm |

3. | 15 cm | 4. | 2 cm |

Subtopic: Pressure |

68%

From NCERT

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The value of g at a place decreases by 2%. Then, the barometric height of mercury:

1. | increases by 2%. | 2. | decreases by 2%. |

3. | remains unchanged. | 4. | sometimes increases and sometimes decreases. |

Subtopic: Pressure |

67%

From NCERT

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The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. The ratio of density of mercury to that of air is ${10}^{4}$. The height of the hill is:

1. | 250 m | 2. | 2.5 km |

3. | 1.25 km | 4. | 750 m |

Subtopic: Pressure |

63%

From NCERT

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A vertical U-tube of uniform inner cross section, contains mercury in both its arms. A glycerin (density = 1.3 g/${\mathrm{cm}}^{3}$) column of length 10 cm is introduced into one of its arms. Oil of density 0.8 gm/${\mathrm{cm}}^{3}$ is poured into the other arm until the upper surfaces of the oil and glycerin are at the same horizontal level. Find the length of the oil column. [Density of mercury = 13.6 g/${\mathrm{cm}}^{3}$]

1. 10.4 cm

2. 8.2 cm

3. 7.2 cm

4. 9.6 cm

Subtopic: Pressure |

63%

From NCERT

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A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up, the reading will be:

1. | zero. | 2. | equal to 76 cm. |

3. | more than 76 cm. | 4. | less than 76 cm. |

Subtopic: Pressure |

63%

From NCERT

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There are four cylindrical vessels identical in dimensions. If these are filled with equal masses of four different liquids P, Q, R, and S such that their densities are ${\mathrm{\rho}}_{\mathrm{p}}$ $>$ ${\mathrm{\rho}}_{\mathrm{Q}}$ $>$ ${\mathrm{\rho}}_{\mathrm{R}}$ $>$ ${\mathrm{\rho}}_{\mathrm{S}}$, then pressure at the base of vessel will be:

1. | ${\mathrm{P}}_{\mathrm{p}}$ $=$ ${\mathrm{P}}_{\mathrm{Q}}$ $=$ ${\mathrm{P}}_{\mathrm{R}}$ $=$ ${\mathrm{P}}_{\mathrm{S}}$ | 2. | ${\mathrm{P}}_{\mathrm{p}}$ $>$ ${\mathrm{P}}_{\mathrm{Q}}$ $>$ ${\mathrm{P}}_{\mathrm{R}}$ $>$ ${\mathrm{P}}_{\mathrm{S}}$ |

3. | ${\mathrm{P}}_{\mathrm{p}}$ $<$ ${\mathrm{P}}_{\mathrm{Q}}$ $<$ ${\mathrm{P}}_{\mathrm{R}}$ $<$ ${\mathrm{P}}_{\mathrm{S}}$ | 4. | Data is insufficient to predict the relation |

Subtopic: Pressure |

58%

From NCERT

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Which of the following diagrams does not represent a streamline flow?

1. | 2. | ||

3. | 4. |

Subtopic: Types of Flows |

88%

From NCERT

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Three liquids of densities \(d,\) \(2d\) and \(3d\) are mixed in equal proportions of weights. The relative density of the mixture is:

1. | \(11d \over 7\) | 2. | \(18d \over 11\) |

3. | \(13d \over 9\) | 4. | \(23d \over 18\) |

Subtopic: Properties of Fluids |

75%

From NCERT

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