For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

The following mediators increase capillary permeability in acute inflammation

A

Histamine

B

Bradykinin

C

Prostacyclin

D

Platelet Derived Growth Factor (PDG

E

Angiotensin

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 degree . If the capillary tube is dipped vertically in the liquid, then the liquid:

A

Will rise in the tube

B

Will get depressed in the tube

C

Will rise -up to 10 cm in the tube and will over flow

D

Will neither rise nor fall in the tube.

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 Degree. If the capillary tube is dipped vertically in the liquid, then the liquid:

A

Will rise in the tube

B

Will get depressed in the tube

C

Will rise-up to 10 cm in the tube and will over flow

D

Will neither rise not fall in the tube

Capillary permeability is increased by

A

Histamine

B

Viral infection

C

Burn

D

Vitamin C excess

E

Prolonged ischemia

Vascular permeability of capillary is increased by

A

Il-1

B

Bradykinin

C

Serotonin

D

IL-6

E

Thromboxane A2

If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the

A

Pressure

B

Temperature

C

Both A & B

D

Neither A nor B

Knudsen diffusion is directly proportional to

A

T

B

$$\sqrt {\text{T}} $$

C

$$\frac{1}{{\sqrt {\text{T}} }}$$

D

T²

The Knudsen diffusivity is dependent on the

A

Molecular velocity only

B

Pore radius of the catalyst only

C

Molecular mean free path only

D

Molecular velocity and por radius of the catalyst

Water flows into an empty 64-gallon drum through pipe A and flows out through pipe B. If the rate of flow through A is 2 gallons/hour, how many gallons per hour must flow out through pipe B so that the drum is full in exactly 96 hours?

A

3/8

B

1/2

C

2/3

D

4/3

For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.

Related Questions