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An airplane of a total wing area of \(120~\text{m}^2\) is in a level flight at some height. If the pressure difference between the upper and lower surface is \(2.5~\text{kPa},\) then the mass of the airplane is:

(Take \(g=10~\text{ms}^{-2}\))

1. \(2\times10^3~\text{kg}\)

2. \(3\times10^4~\text{kg}\)

3. \(5\times10^4~\text{kg}\)

4. \(7\times10^4~\text{kg}\)

(Take \(g=10~\text{ms}^{-2}\))

1. \(2\times10^3~\text{kg}\)

2. \(3\times10^4~\text{kg}\)

3. \(5\times10^4~\text{kg}\)

4. \(7\times10^4~\text{kg}\)

Subtopic: Pressure |

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For the figures given below, the correct observation is:

1. | pressure at the bottom of the tank (a) is greater than at the bottom of the tank (b). |

2. | pressure at the bottom of the tank (a) is lesser than at the bottom of (b). |

3. | pressure depends upon the shape of the container. |

4. | pressure at the bottom of (a) and (b) are the same. |

Subtopic: Pressure |

85%

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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. | The maximum force on the base will be for the vessel \(C.\) |

2. | The maximum force on the base will be for the vessel \(B.\) |

3. | The maximum force on the base will be for the vessel \(A.\) |

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

Subtopic: Pressure |

82%

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If pressure at half the depth of a lake is equal to 2/3^{rd} the pressure at the bottom of the lake, then the depth of the lake is:

1. | 10 m | 2. | 20 m |

3. | 60 m | 4. | 30 m |

Subtopic: Pressure |

70%

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A diver is \(10\) m below the surface of the water. The approximate pressure experienced by the diver is:

1. \(10^5\) Pa

2. \(2\times10^5\) Pa

3. \(3\times10^5\) Pa

4. \(4\times 10^5\) Pa

Subtopic: Pressure |

67%

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

1. | \(10~\text{cm}\) | 2. | \(6~\text{cm}\) |

3. | \(15~\text{cm}\) | 4. | \(2~\text{cm}\) |

Subtopic: Pressure |

68%

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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%

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

1. | \(250 ~\text m\) | 2. | \(2.5 ~\text {km}\) |

3. | \(1.25 ~\text {km}\) | 4. | \(750 ~\text m\) |

Subtopic: Pressure |

63%

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A siphon in use is demonstrated in the following figure. The density of the liquid flowing in the siphon is 1.5 gm/cc. The pressure difference between the point P and S will be:

1. | 10^{5} N / m |
2. | 2 × 10^{5} N / m |

3. | Zero | 4. | Infinity |

Subtopic: Pressure |

65%

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

(density of mercury \(=13.6\) g/cm^{3})

1. \(10.4\) cm

2. \(8.2\) cm

3. \(7.2\) cm

4. \(9.6\) cm

Subtopic: Pressure |

64%

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