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. $$7\times10^4~\text{kg}$$

Subtopic:  Pressure |
84%
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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%
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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%
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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%
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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 |
74%
From NCERT
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