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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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 |
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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If pressure at half the depth of a lake is equal to 2/3rd 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%
From NCERT
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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 |
66%
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 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:

 1 105  N / m 2 2 × 105  N / m 3 Zero 4 Infinity
Subtopic:  Pressure |
65%
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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