An airplane of a total wing area of \(120\) m2 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 \(g=10\) 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 cm2. 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 104. 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/cm3) column of length 10 cm is introduced into one of its arms. Oil of density 0.8 gm/cm3 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/cm3]  
                       
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 ρp > ρQ > ρR > ρS, then pressure at the base of vessel will be: 

1. Pp = PQ = PR = PS 2. Pp > PQ > PR > PS
3. Pp < PQ < PR < PS 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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