1. Gravitational settling chambers are generally used to remove particles of usu

Question

1. Gravitational settling chambers are generally used to remove particles of usually ____________________ size from gas stream

Select one:

< 01 m

< 10 m

> 10 m

> 50 m

2. What is ‘Montreal Protocol’ is related to

Select one:

An agreement among countries to take steps for reducing global warming

An agreement among countries to take steps for reducing CFCs

An agreement among countries to start using nuclear energy

None of the above

3. In dry deposition accounts for about __________ percent of the total particulate removal from the atmosphere

Select one:

80

60

40

20

4. Which of the following is the liquid form of aerosol

Select one:

Mist

Fume

Dust

Smoke

5. Ozone layer is formed

Select one:

In between troposphere and stratosphere

Above mesosphere

In between stratosphere and mesosphere

Above stratosphere

Explanation / Answer

1. > 50 m

Explaination: Gravitational settling chambers are generally used to remove particles of usually size > 50 m from a gas stream. Gravitational settling chambers consist of a large chamber which carries a gas. A gas velocity is reduced when gas is passing through the chamber. Due to gravity effect, the solid particles settled down from a lower velocity gas stream and it is collected in a container.

2. Montreal Protocol is an agreement between among countries to take steps for reducing CFCs.

Explanation: Montreal Protocol is mainly related with ozone layer depletion. Under the Montreal Protocol which was signed in 1987, it is decided to reduce the amount of substances which are mainly responsible for ozone layer depletion. Ozone layer depletion is mainly due to chlorofluorocarbons present in atmosphere . So it is decided to reduce amount of chlorofluorocarbons (CFCs) present in air.

3. 60

Explaination: Dry depositions refer to acidic gases and particles present in the atmospheric air. It is around 60 percent in an atmosphere.

.4. Mint

Explaination: Aerosol is a fine particles that present in atmospheric air or any gas. Aerosol may be in solid or liquid form. In a given question mint is an example of liquid form of aerosol. Other given examples are solid or gaseous aerosols.

5. Ozone layer is formed in between troposphere and stratosphere.

Explaination: The first layer of an atmosphere is known as troposphere which is above 15 km high from earth’s surface. The next layer is stratosphere which extends from 15 km to about 60 km. Ozone layer lies between troposphere and stratosphere at the high about 15 km.

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