Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

A

CO

B

SO₂

C

NO_x

D

CFC (chloro fluoro carbons)

Upper atmospheric 03 layer is depleted by---

A

Ammonia gas

B

Carbon

C

Freon gas

D

Helium gas

Ozone level is generally found to be depleted in India in the month of

A

February

B

July

C

April

D

December

Name the international treaty designed to protect the ozone layer from CFCs.

A

Sigma protocol

B

Montreal protocol

C

Ozone protocol

D

Green protocol

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

A

3, 3, 1, 7

B

3, 2, 1, none

C

3, 2, 1, 7

D

3, 3, 2, none

E

All of the above

Which layer of of atmosphere contains the ozone layer?

A

Mesosphere

B

Stratosphere

C

Troposphere

D

Thermosphere

The earth's resources are being depleted too fast. To correct this , Alpha country must keep its resource consumption at present levels for many years to come. Which of the following , if true , would most strengthen the argument above ?

A

New resource deposits are constantly being discovered

B

Other countries need economic development more than Alpha country does.

C

Alpha country consumes one-third of all resources used in the world

D

Other countries have agreed to hold their resource consumption at present levels

Now the soils are depleted and the fields are 'barren' .

A

plentiful

B

productive

C

dirty

D

loose

The earth's resources are being depleted much too fast, To correct this, as a developing country, Bangladesh must keep its resource consumption at present levels for many years to come". The argument in this statement is based on which of the following assumptions?

A

Per capital resource consumption in Bangladesh is at an all-tome high

B

Curbing resource consumption of Bangladesh will significantly delay world resource delpetion

C

Bangladesh uses more resources than any other country

D

Bangladesh imports most of the resources it uses.

Unless the new reserves are found soon, the world's supply of coal is being depleted in such a way that with demand continuing to grow at present rates, reserves will be exhausted by the year 2050. Which of the following , if true , will weaken he above a

A

There has been a slowdown in the rate of increase in world demand for coal over the last 5 years from 10% to 5%

B

It has been known for many years that there are vast stocks of coal under Antarctica which have yet to be economically exploited

C

Oil is being used increasingly in place of coal for many industrial and domestic uses

D

As coal resources are depleted more and marginal supplies , which are more costly to produce and less efficient in use , are being mined

Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of

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