Energy \[=3VT\left( \frac{1}{r}-\frac{1}{R} \right)\] is released
done
clear
D)
Energy is neither released nor absorbed
done
clear
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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
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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)
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
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