The heart of a man pumps 5 L of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury is \(13.6\times 10^3\)kg/m3 and g =10 m/s2, then the power of heart in watt is:
1. 1.70
2. 2.35
3. 3.0
4. 1.50

Subtopic:  Pressure |
 53%
From NCERT
NEET - 2015
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Water rises to a height h in capillary tube . If the length of capillary tube above the surface of water is made less than h, then

(1) water rises upto the tip of capillary tube and then starts overflowing like a fountain

(2) water rises upto the top of capillary tube and stays there without overflowing

(3) water rises upto a point a little below the top and stays there

(4) water does not rise at all

Subtopic:  Capillary Rise |
 75%
From NCERT
NEET - 2015
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A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then:\(\text { Energy }=4 V T\left(\frac{1}{r}-\frac{1}{R}\right) \text { is released } \)

1. Energy = \(4 V T\left(\frac{1}{r}-\frac{1}{R}\right)\) is released 2. Energy =\(3 V T\left(\frac{1}{r}+\frac{1}{R}\right)\)  is released
3. Energy =\(3 V T\left(\frac{1}{r}-\frac{1}{R}\right)\) is released 4. Energy is neither released nor absorbed

Subtopic:  Surface Tension |
 65%
From NCERT
NEET - 2014
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An engine pumps water continuously through a hose. Water leaves the hose with a velocity \(v\) and \(m\) is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

1. \(\dfrac{1}{2} m v^{3}\)                                   

2. \(m v^{3}\)

3. \(\dfrac{1}{2} m v^{2}\)                                   

4. \(\dfrac{1}{2} m^{2} v^{2}\)

Subtopic:  Bernoulli's Theorem |
 67%
From NCERT
NEET - 2009
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Two bodies are in equilibrium when suspended in water from the arms of a balance. The mass of one body is \(36~\text g\) and its density is \(9~\text{g/cm}^3.\) If the mass of the other is \(48~\text g,\) its density in \((\text{g/cm}^3)\) will be:
1. \(\frac{4}{3}\)
2. \(\frac{3}{2}\)
3. \(3\)
4. \(5\)

Subtopic:  Archimedes' Principle |
 50%
From NCERT
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An inverted bell lying at the bottom of a lake 47.6 m deep has 50 cm3 of air trapped in it. The bell is brought to the surface of the lake. The volume of the trapped air will be (atmospheric pressure = 70 cm of Hg and density of Hg = 13.6 g/cm3
(1) 350 cm3                               

(2) 300 cm3

(3) 250 cm3                               

(4) 22 cm3

Subtopic:  Pressure |
 58%
From NCERT
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A siphon in use is demonstrated in the following figure. The density of the liquid flowing in 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 |
 66%
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. 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 |
 66%
From NCERT
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Equal masses of water and a liquid of relative density 2 are mixed together, then the mixture has a density of
(1) 2/3                                 

(2) 4/3

(3) 3/2                                 

(4) 3

Subtopic:  Properties of Fluids |
 66%
From NCERT
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A body of density d1 is counterpoised by Mg of weights of density d2 in air of density d. Then the true mass of the body is

(1) M                                   

(2) M1-dd2

(3) M1-dd1                       

(4) M(1-d/d2)(1-d/d1)

Subtopic:  Archimedes' Principle |
 51%
From NCERT
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