# A fluid of density $$\rho~$$is flowing in a pipe of varying cross-sectional area as shown in the figure. Bernoulli's equation for the motion becomes:                1.  $$p+\frac12\rho v^2+\rho gh\text{=constant}$$ 2. $$p+\frac12\rho v^2\text{=constant}$$ 3. $$\frac12\rho v^2+\rho gh\text{=constant}$$ 4. $$p+\rho gh\text{=constant}$$

Subtopic:  Bernoulli's Theorem |
88%
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NEET - 2022
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Air is pushed carefully into a soap bubble of radius $$r$$ to double its radius. If the surface tension of the soap solution is $$T,$$ then work done in the process is:

 1 $$12\pi r^2T$$ 2 $$24\pi r^2T$$ 3 $$4\pi r^2T$$ 4 $$8\pi r^2T$$
Subtopic:  Surface Tension |
60%
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NEET - 2022
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Two copper vessels $$A$$ and $$B$$ have the same base area but are of different shapes. $$A$$ takes twice the volume of water that $$B$$ requires to fill up to a particular common height. Then the correct statement among the following is:
1. pressure on the base area of vessels $$A$$ and $$B$$ is same.
2. pressure on the base area of vessels $$A$$ and $$B$$ is not same.
3. both vessels $$A$$ and $$B$$ weigh the same.
4. vessel $$B$$ weighs twice that of $$A$$.
Subtopic:  Pressure |
68%
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NEET - 2022
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The terminal velocity of a copper ball of radius $$5~\text{mm}$$ falling through a tank of oil at room temperature is $$10~\text{cm}~\text{s}^{-1}$$ . If the viscosity of oil at room temperature is $$0.9~\text{kg}~\text{m}^{-1}~\text{s}^{-1}$$, the viscous drag force is:
1. $$8.48 \times10^{-3}$$ N
2. $$8.48 \times10^{-5}$$ N
3. $$4.23 \times10^{-3}$$ N
4. $$4.23 \times10^{-6}$$ N
Subtopic:  Stokes' Law |
64%
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NEET - 2022
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The correct statement about the variation of viscosity of fluids with an increase in temperature is:

 1 viscosity of gases decreases. 2 viscosity of both liquids and gases increases. 3 viscosity of liquids increases. 4 viscosity of liquids decreases.
Subtopic:  Viscosity |
73%
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NEET - 2022
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A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball ($$v$$) as a function of time ($$t$$) is:

1. $$D$$
2. $$A$$
3. $$B$$
4. $$C$$
Subtopic:  Viscosity |
71%
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If a soap bubble expands, the pressure inside the bubble:
 1 is equal to the atmospheric pressure 2 decreases 3 increases 4 remains the same
Subtopic:  Surface Tension |
68%
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NEET - 2022
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The venturi-meter works on:
 1 The principle of perpendicular axes 2 Huygen's principle 3 Bernoulli's principle 4 The principle of parallel axes
Subtopic:  Bernoulli's Theorem |
82%
From NCERT
NEET - 2023
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The amount of energy required to form a soap bubble of radius $$2~\text{cm}$$ from a soap solution is nearly:
$$($$surface tension of soap solution $$0.03~\text{Nm}^{-1})$$
1. $$50.1 \times 10^{-4}~\text{J}$$
2. $$30.16 \times 10^{-4}~ \text{J}$$
3. $$5.06 \times 10^{-4} ~\text{J}$$
4. $$3.01\times 10^{-4} ~\text{J}$$
Subtopic:  Surface Tension |
58%
From NCERT
NEET - 2023