Recommended PYQs (STRICTLY NCERT Based) Mechanical Properties of Fluids Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

A thin flat circular disc of radius

4.5 cm

$4.5~\text {cm}$ is placed gently over the surface of water. If the surface tension of water is

0.07 {Nm}^{- 1},

$0.07~\text{Nm}^{-1},$ then the excess force required to take it away from the surface is:
1.

198 N

$198~\text{N}$
2.

1.98 mN

$1.98~\text{mN}$
3.

99 N

$99~\text{N}$
4.

19.8 mN

$19.8~\text{mN}$

Subtopic: Surface Tension |

53%

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Q2:

A wire of length

L

$L$ and radius

r (r ≪ L)

$r(r\ll L)$ is kept floating on the surface of a liquid of density

ρ .

$\rho.$ The maximum radius of the wire for which it may not sink is:
(the surface tension of liquid is

T

$T$ )

1.	$\sqrt { \dfrac{T}{\rho g}}$	2.	$\sqrt { \dfrac{2T}{\rho g}}$
3.	$\sqrt{\dfrac{2T\rho}{\pi g}}$	4.	$\sqrt{\dfrac{2T} {\pi \rho g}}$

Subtopic: Surface Tension |

60%

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Q3:

The pressure experienced by a swimmer

20 m

$20~\text{m}$ below the water surface in a lake is appropriately:
(Given density of water =

10^{3} {kgm}^{- 3}, g = 10 {ms}^{- 2}

$10^3 ~\text{kgm}^{-3},~ g=10 ~\text{ms}^{-2}$ and

1 atm = 10^{5} Pa

$1~\text{atm} = 10^5~\text{Pa}$ )

1.	$1~\text{atm}$	2.	$2~\text{atm}$
3.	$3~\text{atm}$	4.	$4~\text{atm}$

Subtopic: Pressure |

72%

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Q4:

An ideal fluid is flowing in a non-uniform cross-sectional tube

X Y

$XY$ (as shown in the figure) from end

X

$X$ to end

Y .

$Y.$ If

K_{1}

$K_1$ and

K_{2}

$K_2$ are the kinetic energies per unit volume of the fluid at

X

$X$ and

Y

$Y$ respectively, the correct relationship between

K_{1}

$K_1$ and

K_{2}

$K_2$ is:

1.	$K_1=K_2$	2.	${2K}_1={K}_2$
3.	${K}_1>{K}_2$	4.	${K}_1<{K}_2$

Subtopic: Bernoulli's Theorem |

70%

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Q5:

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 |

85%

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Q6:

The amount of energy required to form a soap bubble of radius

2 cm

$2~\text{cm}$ from a soap solution is nearly:

(

$($ the surface tension of soap solution

0.03 {Nm}^{- 1})

$0.03~\text{Nm}^{-1})$
1.

50.1 \times 10^{- 4} J

$50.1 \times 10^{-4}~\text{J}$
2.

30.16 \times 10^{- 4} J

$30.16 \times 10^{-4}~ \text{J}$
3.

5.06 \times 10^{- 4} J

$5.06 \times 10^{-4} ~\text{J}$
4.

3.01 \times 10^{- 4} J

$3.01\times 10^{-4} ~\text{J}$

Subtopic: Surface Tension |

61%

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Q7:

Which of the following statements is not true?

1.	The coefficient of viscosity is a scalar quantity.
2.	Surface tension is a scalar quantity.
3.	Pressure is a vector quantity.
4.	Relative density is a scalar quantity.

Subtopic: Pressure |

72%

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Q8:

The viscous drag acting on a metal sphere of diameter

1

$1$ mm, falling through a fluid of viscosity

0.8

$0.8$ Pa-s with a velocity of

2

$2$ m s^–1 is nearly equal to:

1.	$15\times 10^{-3}~\text{N}$	2.	$30\times 10^{-3}~\text{N}$
3.	$1.5\times 10^{-3}~\text{N}$	4.	$20\times 10^{-3}~\text{N}$

Subtopic: Stokes' Law |

62%

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Q9:

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 |

70%

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Q10:

A spherical ball is dropped into a long column of a highly viscous liquid. The graph that represents the speed of the ball

(v)

$(v)$ as a function of time

(t)

$(t)$ is:

1.	$D$	2.	$A$
3.	$B$	4.	$C$

Subtopic: Viscosity |

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