Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 20

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If a water drop is kept between two glass plates, then its shape is

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Important Questions on Properties of Bulk Matter

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 21

A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soapwater solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 22

In a capillary tube experiment, a vertical $30 cm$ long capillary tube is dipped in water. The water rises up to a height of $10 cm$ due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 23

Two drops of-equal size are falling vertically through air with a constant terminal velocity of

0.15 cm s^{- 1} .

What should be the velocity if these drops coalesce to form one drop?

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 24

A metal plate having an area of

0.04 m^{2}

is placed on a horizontal wooden surface. Oil of coefficient of viscosity

2 N s m^{- 2}

is introduced between the plate and the surface till the thickness of the oil layer is

0.5 mm

. The horizontal force needed to drag the plate along the surface with a velocity of

5 cm s^{- 1}

is

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 25

Terminal velocity of a steel ball of diameter

0.2 cm

when falls through a tube filled with glycerine is

[g = 9.8 m s^{- 2},

density of steel = 8000 kg m^{- 3}

density of glycerine = 1330 kg m^{- 3}

,

η = 8.33 poise

]

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 26

A drop of radius

2 \times 10^{- 5} m

and density

1.2 \times 10^{3} kg m^{- 3}

falls through air. The viscosity of air is

1.8 \times 10^{- 5} N s m^{- 2}

. Neglecting buoyancy due to air, the terminal speed of the drop is

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 27

If Reynold's number is greater than

3000

, the flow of liquid is

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Physics Crash Course NEET>Chapter 7 - Properties of Bulk Matter>Level 3>Q 28

Water is flowing through a tube of diameter

1 cm

at

8 cm s^{- 1}

. Taking

η = 10^{- 2} poise

the flow of liquid and Reynold's number are