Environmental Acid Rain and Aerosol Test - 2

1. What is the statement of the Kelvin effect in fluid droplets?

Vapour pressure of the droplet varies with the diameter of the droplet as well as the temperature

Vapour pressure about a droplet increases with decrease in diameter of the droplet

Vapour pressure of the droplet is independent of the diameter of the droplet

Vapour pressure about a droplet decreases with decrease in diameter of the droplet

2. Formation of aerosols by nucleation produces particles of size __________

Greater than 1 micron

Less than 1 micron

Greater than 0.1 micron

Less than 0.1 micron

3. Particle movement due to photophoresis depends on _________

Wavelength and intensity of incident light

All of the mentioned

Shape and size of the particle

Optical properties of the particle

4. The movement of particles from region of lower vapour to high vapour molecule concentration is known as diffusiophoresis.

True

False

5. When a given gas has a temperature gradient, the aerosol particles move from higher temperature regions to low temperature regions. This effect is known as __________

Photophoresis

Diffusiophoresis or Thermophoresis

Thermophoresis

Diffusiophoresis

6. The size of aerosol particles formed mechanically is minimum 1 micron.

False

True

7. What does the aerodynamic diameter of an aerosol indicate?

Average diameter of aerosol particles present in unit volume of air

Size of the aerosol particle when floating in air

Maximum size of aerosol particle that can float in the air

Equivalent diameter of a sphere having same volume as that of the aerosol

8. What is/are the inertial method(s) used to measure size of aerosol particles?

Particle acceleration method

Pulsation method

All of the mentioned

Multi cyclone

9. Aerosols contribute to global warming.

False

True

10. What is the size of the particles categorised as aerosols?

Greater than 1 micron

Less than 1 micron

Between 0.01-1 micron

Less than 0.01 micron