Fluid Mechanics - CBSE STD 12 Science JEE physics Questions

Q 1Assertion & Reason1 Mark

Assertion : Bernoulli's theorem holds for incompressible, nonviscous fluids.
Reason : The factor $\frac{v}{g}$ is called velocity head.

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Q 2Assertion & Reason1 Mark

Assertion : Cars and aeroplanes are streamlined.
Reason : This is done to reduce the backward drag due to atmosphere.

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Q 3Assertion & Reason1 Mark

Assertion : When two boats sails parallel in the same direction and close to each other, they are pulled towards each other.
Reason : The viscous drag on a spherical body moving with speed $v$ is proportional to $v$.

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Q 4Assertion & Reason1 Mark

Assertion : Terminal velocity is same as the critical velocity.
Reason : The constant velocity of fall of a body through a viscous fluid is called terminal velocity.

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Q 5Assertion & Reason1 Mark

Assertion : To empty an oil tank, two holes are made.
Reason : Oil will come out two holes so it will emptied faster.

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Q 6MCQ1 Mark

A hemispherical bowl just floats without sinking in a liquid of density $1.2 \times 10 kg / m$. If outer diameter and the density of the bowl are $1 m$ and $2 \times 10 kg / m$ respectively, then the inner diameter of the bowl will be

A
$0.94 m$
B
$0.97 m$
✓
$0.98 m$
D
$0.99 m$

Answer: C.

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Q 7MCQ1 Mark

Water is flowing through a tube of non-uniform cross-section ratio of the radius at entry and exit end of the pipe is $3: 2$. Then the ratio of velocities at entry and exit of liquid is

✓
$4: 9$
B
$9: 4$
C
$8: 27$
D
$1: 1$

Answer: A.

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Q 8MCQ1 Mark

If pressure at half the depth of a lake is equal to $2 / 3$ pressure at the bottom of the lake then what is the depth of the lake

A
$10 m$
✓
$20 m$
C
$60 m$
D
$30 m$

Answer: B.

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Q 9MCQ1 Mark

In which one of the following cases will the liquid flow in a pipe be most streamlined

A
Liquid of high viscosity and high density flowing through a pipe of small radius
✓
Liquid of high viscosity and low density flowing through a pipe of small radius
C
Liquid of low viscosity and low density flowing through a pipe of large radius
D
Liquid of low viscosity and high density flowing through a pipe of large radius

Answer: B.

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Q 10MCQ1 Mark

Water falls from a tap, down the streamline

A
Area decreases
✓
Area increases
C
Velocity remains same
D
Area remains same

Answer: B.

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Fluid Mechanics question types

Fluid Mechanics questions

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Fluid Mechanics JEE physics - Fluid Mechanics

Fluid Mechanics question types

Fluid Mechanics questions

Generate a Fluid Mechanics paper free