A rectangular vessel when full of water takes 10 minutes to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water
(a) 9 minute                        (b) 7 minute
(c) 5 minute                        (d) 3 minute

Concept Questions :-

Bernoulli theorem
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A streamlined body falls through air from a height h on the surface of a liquid. If d and D(D > d) represents the densities of the material of the body and liquid respectively, then the time after which the body will be instantaneously at rest, is

(a) 2hg                          (b) 2hg·Dd

(c) 2hg·dD                    (d) 2hgdD-d

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Archimedes principle
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A large tank of cross-section area A is filled with water to a height H. A small hole of area 'a' is made at the base of the tank. It takes time T1 to decrease the height of water to Hη(η>1) ; and it takes T2 time to take out the rest of water. If T1=T2, then the value of η is
(a) 2                                    (b) 3
(c) 4                                    (d) 22

Concept Questions :-

Bernoulli theorem
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 As the temperature of water increases, its viscosity

(a) Remains unchanged

(b) Decreases

(c) Increases

(d) Increases or decreases depending on the external pressure

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A small drop of water falls from rest through a large height h in air; the final velocity is

(a) h

(b) h

(c) (1/h)

(d) Almost independent of h

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The rate of flow of liquid in a tube of radius r, length l, whose ends are maintained at a pressure difference P is V=πQPr4ηl where η is coefficient of the viscosity and Q is

(a) 8                      (b) 18

(c) 16                     (d) 116

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Water flows in a streamlined manner through a capillary tube of radius a, the pressure difference being P and the rate of flow Q. If the radius is reduced to a/2 and the pressure increased to 2P, the rate of flow becomes

(a) 4Q                          (b) Q

(c) Q4                          (d) Q8

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Water is flowing in a pipe of diameter 4 cm with a velocity 3 m/s. The water then enters into a tube of diameter 2 cm. The velocity of water in the other pipe is
(a) 3 m/s                                        (b) 6 m/s
(c) 12 m/s                                       (d) 8 m/s

Concept Questions :-

Equation of continuity
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A manometer connected to a closed tap reads 4.5×105 pascal. When the tap is opened the reading of the manometer falls to 4×105 pascal. Then the velocity of flow of water is 
1. 7  ms-1                             2. 8 ms-1
3. 9 ms-1                              4. 10 ms-1

Concept Questions :-

Bernoulli theorem
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What is the velocity v of a metallic ball of radius r falling in a tank of liquid at the instant when its acceleration is one-half that of a freely falling body ? (The densities of metal and of liquid are ρ and σ respectively, and the viscosity of the liquid is η).

(a) r2g9ηρ-2σ                     (b) r2g9η2ρ-σ

(c) r2g9ηρ-σ                        (d) 2r2g9ηρ-σ

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