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Solution for Class 12, Physics, Fluid

Views: 5,591

100 kg of iron and cotton are weghed by using a spring balance on the surface of the earth if

R_{1}

R_{2}

are the reading shown by the balance, thena.

R_{1} < R_{2}

R_{1} = R_{2}

R_{1} > R_{2}

R_{1} = R_{2} = 0

Topic:

Fluid

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Views: 5,165

A ball floats on the surface of water in a container exposed to atmosphere.
Statement-1 : If the container is shifted to moon, the ball will rise a little (gravity on moon is

\frac{1}{6}

th that on the earth).
And
Statement-2 : Buoyant force on the ball will decrease.a. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1 b. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1 c. Statement-1 is True, Statement-2 is False d. Statement-1 is False, Statement-2 is True

Topic:

Fluid

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Views: 5,608

A balloon is filled with air and a stone is tied to it by thread. It is then put inside a vessel containing water, where it barely floats as shown in the adjoining figure. If it is pushed more towards the bottom by a small distance, it sinks. Explain.

Topic:

Fluid

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Views: 5,451

A beaker filled with water, is accelerated at a rate a

\frac{m}{s ^{2}}

in forward direction. The surface of water shall make an angle a.

tan^{- 1} (\frac{a}{g})

tan^{- 1} (\frac{a}{g})

cot^{- 1} (\frac{g}{a})

cot^{- 1} (\frac{g}{a})

Topic:

Fluid

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Views: 5,278

A beaker is partly filled with water, the beaker and the contents have a mass of 50 gm. A piece of wood having a volume of 5 cc. is floated in the beaker. The density of wood is

0.8 \frac{g}{c . c}

the mass of the beaker and its contents:a. 50 g b. 54 g c. 46 g d. 56.25 g

Topic:

Fluid

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Views: 5,077

A block is fully submerged in a vessel filled with water by a spring attached to the bottom of the vessel. In equilibrium position spring is compressed. If the vessel now moves downwards with an acceleration

a (< g)

. What happens to the length of the spring.?

Topic:

Fluid

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Views: 5,405

A block of ice (specified gravity

S_{i -} = 0.90

) is floating in a container having two immiscible liquids (one of specific gravity

S = 0.50

and other is water) as shown in the figure. (H,

H_{2}

are height of water other liquid columns respectively). Now the ice block melts completely,thena.

H_{2}

will decrease b.

H_{1}

will increase c.

H_{1} + H_{2}

will remains unchanged d.

H_{1} + H_{2}

Topic:

Fluid

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Views: 5,272

A block of ice with a large pebblle frozen inside it is floating on water contained in a beaker. Will the level of water increase or decrease when the ice around the pebble melts completely?

Topic:

Fluid

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Views: 5,925

A block of wood floats in water with

(\frac{4}{5})^{t h}

of its volume submerged. In an oil, it floats with

(\frac{9}{10})^{t h}

volume submerged. The ratio of the density of oil and water isa.

\frac{8}{9}

\frac{9}{8}

\frac{19}{25}

\frac{25}{18}

Topic:

Fluid

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Question 10

Views: 5,088

A body is floating in water with 3/5th of its volume below the water surface. What will be density of the body?

Topic:

Fluid

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Question 11

Views: 5,376

A body will weigh maximum in which case? Water or in vacuum

Topic:

Fluid

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Question 12

Views: 5,400

A body of density

ρ

is dropped from reat from a height h into a lake of density

σ (σ > ρ)

. The maximum depth the body sinks inside the liquid is (neglect viscous effect of liquid)a. 10 m b. 40 m c. 20 m d. 5 m

Topic:

Fluid

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Question 13

Views: 5,066

A capillary tube has a uniform bore of radius 1 mm. It is palced in water of surface tesion

0.07 N m^{- 1}

. Mass of water rised into the capillary tube is a. 44 mg b. 44 gm c. 44 kg d. 4.4 kg

Topic:

Fluid

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Question 14

Views: 5,008

A capillary tube of length 25 cm and diameter 0.1cm is fitted horizontally to a vessel full of a liquid of coefficient of visocity 0.012 cgs unit. The depth of the capillary tube below the surface of liquid is 15 cm. If the density of liquid is

0.8 g / c m^{3}

, calculate the amount of the liquid that will flow out in 7 minutes. Take

g = 980 c m / s^{2}

Topic:

Fluid

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Question 15

Views: 5,189

A capillary tube of radius r is immersed in waer and water rises in it to a height h. The mass of water in the capillary tube is 5g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is a. 2.5 g b. 5.0 g c. 10g d. 20 g

Topic:

Fluid

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Question 16

Views: 5,182

A circular ring is cut from a platinum tube of 8.5 cm iknternal diameter nad 8.7 cm external diameter and supported horizontally from the pan of a balance, and supported horizontally from the pan of a balance, so that it comes in contact with the water in a glass vessel. If an extra weight of 3.97 g, is required to pull it away from water, calculate the surface tension of water.

Topic:

Fluid

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Question 17

Views: 5,635

A column of water

40 c m

high supports a

30 c m

column of an unknown liquid . What is the density of the liquid ?

Topic:

Fluid

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Question 18

Views: 5,550

A cone of radius r and height r is under a liquid of density d.its base is parallel to the free surface of the liquid at a depth H from it as shown.What is the net force due to liquid on its curved surface? (neglect atmospheric pressure)a.

π r^{2} d g (H - \frac{r}{3})

2 π r^{2} d g (H - \frac{2 r}{3})

π r^{2} d g (2 H - \frac{r}{3})

π r^{2} d g (2 H - \frac{2 r}{3})

Topic:

Fluid

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Question 19

Views: 5,414

A conical section of a pipe is shown in figure through which water is flowing. Let A be the area of crosss-section, r be the radius of cross-section, P be the pressure at a point difference and v be the velocity of water.

Match the column-I with column-II containing values of ratio of quantities given in Column-I

Topic:

Fluid

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Question 20

Views: 5,826

A container carrying some liquid shown in the diagram is given some acceleration

a

a

is directed upwards,

P_{A} - P_{B}

increases b. if

a

is directed towards right

P_{A} - P_{B}

decreases c. if

a

is directed downwards,

P_{A} - P_{B}

remains same. d. if

a

directed towards left

P_{A} - P_{B}

Topic:

Fluid

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