Solved papers for NEET Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन NEET PYQ-Fluid Mechanics, Surface Tension and Viscosity

done NEET PYQ-Fluid Mechanics, Surface Tension and Viscosity Total Questions - 13

• question_answer1) The dimensions of universal gravitational constant are:                                [AIPMT (S) 2004]
  A)
   \[[{{M}^{-1}}\,{{L}^{3}}\,{{T}^{-2}}]\]
  done clear
  B)
   \[[M{{L}^{2}}\,{{T}^{-1}}]\]
  done clear
  C)
   \[[{{M}^{-2}}\,{{L}^{3}}\,{{T}^{-2}}]\]     
  done clear
  D)
        \[[{{M}^{-2}}\,{{L}^{2}}\,{{T}^{-1}}]\]
  done clear
  View Answer play_arrow

• question_answer2) The wet ability of a surface by a liquid depends primarily on                         [NEET 2013]
  A)
   viscosity                      
  done clear
  B)
   surface tension
  done clear
  C)
   density
  done clear
  D)
   angle of contact between the surface and the liquid
  done clear
  View Answer play_arrow

• question_answer3) 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                                                                          [NEET 2014]
  A)
   Energy \[=4VT\left( \frac{1}{r}-\frac{1}{R} \right)\] is released
  done clear
  B)
   Energy \[=3VT\left( \frac{1}{r}+\frac{1}{R} \right)\] absorbed
  done clear
  C)

  Energy \[=3VT\left( \frac{1}{r}-\frac{1}{R} \right)\] is released done clear D)  Energy is neither released nor absorbed done clear View Answer play_arrow question_answer4) A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is \[250\,{{m}^{2}}\]. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be \[({{p}_{air}}=1.2kg/{{m}^{3}})\]                                                                   [NEET 2015 ] A)  \[4.8\times {{10}^{5}}N,\] downwards done clear B)  \[4.8\times {{10}^{5}}N,\] upwards done clear C)  \[2.4\times {{10}^{5}}N,\] upwards done clear D)  \[2.4\times {{10}^{5}}N,\] downwards done clear View Answer play_arrow question_answer5) The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is v, the speed of the ejection of the liquid through the holes is          [NEET 2015 (Re)] A)  \[\frac{v{{R}^{2}}}{{{n}^{2}}{{r}^{2}}}\]             done clear B)  \[\frac{v{{R}^{2}}}{n{{r}^{2}}}\] done clear C)  \[\frac{v{{R}^{2}}}{{{n}^{3}}{{r}^{2}}}\] done clear D)       \[\frac{{{v}^{2}}R}{nr}\] done clear View Answer play_arrow question_answer6) 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 be \[13.6\times {{10}^{3}}kg/{{m}^{3}}\] and \[g=10m/{{s}^{2}},\] then the power of heart in watt is                                                                                                                                          [NEET 2015 (Re)] A)  1.70                 done clear B)       2.35                 done clear C)  3.0                   done clear D)       1.50 done clear View Answer play_arrow question_answer7) Water rises to a height W in capillary tube. If the length of capillary tube above the surface of water is made less than ‘A’, then                                                                                                                                        [NEET 2015 (Re)] A)  water rises upto the tip of capillary tube and then starts over flowing like a fountain done clear B)  water rises upto the top of capillary tube and stays there without overflowing done clear C)  water rises upto a point a little below the top and stays there done clear D)  water does not rise at all done clear View Answer play_arrow question_answer8) Two non-mixing liquids of densities \[\rho \] and\[n\rho (n>1)\] are put in a container. The height of each liquid is h. A solid cylinder of length L and density d is put in this container. The cylinder floats with its axis vertical and length \[pL(p<1)\] in the denser liquid. The density d is equal to                                                                               [NEET - 2016] A)  \[\{1+(n+1)p\}\rho \] done clear B)       \[\{2+(n+1)p\}\rho \] done clear C)   \[\{2+(n-1)p\}\rho \] done clear D)       \[\{1+(n-1)p\}\rho \] done clear View Answer play_arrow question_answer9)  All tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is                                             [NEET-2017] A)  \[928\,\,kg\,\,{{m}^{-3}}\]        done clear B)       \[650\,\,kg\,\,{{m}^{-3}}\] done clear C)  \[425\,\,kg\,\,{{m}^{-3}}\]        done clear D)       \[800\,\,kg\,\,{{m}^{-3}}\] done clear View Answer play_arrow question_answer10) A small sphere of radius 'r' falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to                               [NEET - 2018] A)  \[{{\text{r}}^{\text{5}}}\]                   done clear B)       \[{{\text{r}}^{\text{2}}}\] done clear C)  \[{{\text{r}}^{\text{3}}}\]                   done clear D)       \[{{\text{r}}^{\text{4}}}\] done clear View Answer play_arrow question_answer11) A small hole of area of cross-section 2 \[m{{m}^{2}}\]is present near the bottom of a fully filled open tank of height 2 m. Taking\[g=10\text{ }m/{{s}^{2}}\], the rate of flow of water through the open hole would be nearly:  [NEET 2019] A)  \[2.23\times {{10}^{6}}\text{ }{{m}^{3}}/s\] done clear B)  \[6.4\times {{10}^{6}}\text{ }{{m}^{3}}/s\] done clear C)  \[12.6\times {{10}^{6}}\text{ }{{m}^{3}}/s\] done clear D)  \[8.9\times {{10}^{6}}\text{ }{{m}^{3}}/s\] done clear View Answer play_arrow question_answer12) A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of \[2.5\times {{10}^{2}}\]N/m. The pressure inside the bubble equals at a point \[{{Z}_{0}}\]below the free surface of water in a container. Taking\[g=10\text{ }m/{{s}^{2}}\], density of water\[={{10}^{3}}kg/{{m}^{3}}\], the value of \[{{Z}_{0}}\] is:                                                                                                                          [NEET 2019] A)  1 cm    done clear B)       0.5 cm done clear C)  100 cm             done clear D)       10 cm done clear View Answer play_arrow question_answer13) A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is: [NEET 2020] A)  5.0 g    done clear B)       10.0 g done clear C)  20.0 g done clear D)       2.5 g done clear View Answer play_arrow Study Package NEET PYQ-Fluid Mechanics, Surface Tension and Viscosity   Buy Now     Please Wait you are being redirected.... You need to login to perform this action. You will be redirected in 3 sec × Reset Password. 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