Question 1

Explain the differences between pure air and polluted air.

Accepted Answer

Pure air Polluted air1. Pure air contains around 78% nitrogen, 21% oxygen and 0.03% carbon dioxide.1. Polluted air has no such definite composition of these gases.2. Other gases such as argon, methane, ozone, and water vapours  are also present in small quantities. 2. Polluted air has harmful gases like nitrogen dioxide, sulphur dioxide, carbon monoxide, particulate matter etc.3. It is fresh and healthy for lungs.   3. It can cause respiratory diseases.

Question 2

Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into ________________.

Accepted Answer

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Question 3

Suggest a few measures for controlling carbon dioxide levels in the atmosphere.

Accepted Answer

(a) Consumption of petrol in the automobiles should be reduced. (b) The use of CNG or clean fuel should be encouraged. (c) Instead of burning, litter manure should be prepared out of it. (d) Treatment of smoke to remove harmful gases before discharging them into the atmosphere.(e) More trees should be planted.

Question 4

The day-to-day condition of the atmosphere at a place with respect to the _______ is called the weather at that place.

Accepted Answer

The day-to-day condition of the atmosphere at a place with respect to temperature, humidity, rainfall, and wind speed is called the weather at that place.

Question 5

Motor vehicles equipped with catalytic converter are advised to use unleaded petrol because

Accepted Answer

Automobiles fitted with catalytic converter should not use leaded petrol because lead inactivates the catalyst of the converter.

Question 6

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

Accepted Answer

Oxygen present in air is 21% of the air and is essential for the survival of human beings.Hence the correct option is B.

Question 7

Combination of smoke and fog is called _____________.

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Question 8

Catalytic converters, which are fitted into automobiles for reducing the emission of poisonous gases possess which of the following metals as catalyst ?

Accepted Answer

Catalytic converters have costly metals like platinum-palladium and rhodium as catalysts.Exhaust gases first pass through catalytic converters and get filtered.So, The correct answer is (D).

Question 9

Burning of fossil fuels is the main cause of release of ______ dioxide gas in air.

Accepted Answer

The major sources of air pollution are fossil fuels( coal and petroleum) and industries. Coal is largely carbon but contains some incombustible minerals, sulphur and nitrogen. Petroleum consists mainly of hydrocarbons, sulphur and nitrogen but also contains lead. Burning of fossil fuels produces oxides of carbon, nitrogen and sulphur. So, the correct answer is 'Carbon dioxide'.

Question 10

In countries near to polar region, the roads are sprinkled with  CaCl_{2} . This is

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Advanced Knowledge of Control of Air Pollution

A Case Study for Control of Vehicular Pollution

Air Pollution - Introduction

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Quick Summary With Stories

Control of Air Pollution and Electrostatic Precipitator

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Important Questions

Explain the differences between pure air and polluted air.

Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into ________________.

Suggest a few measures for controlling carbon dioxide levels in the atmosphere.

The day-to-day condition of the atmosphere at a place with respect to the _______ is called the weather at that place.

Motor vehicles equipped with catalytic converter are advised to use unleaded petrol because

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

Combination of smoke and fog is called _____________.

Catalytic converters, which are fitted into automobiles for reducing the emission of poisonous gases possess which of the following metals as catalyst ?

Burning of fossil fuels is the main cause of release of ______ dioxide gas in air.

In countries near to polar region, the roads are sprinkled with $C a C l_{2}$ . This is

Revise with Concepts

Advanced Knowledge of Control of Air Pollution

A Case Study for Control of Vehicular Pollution

Air Pollution - Introduction

Learn with Videos

Quick Summary With Stories

Control of Air Pollution and Electrostatic Precipitator

Euro Bharat Vehicular Pollution

Important Questions

Explain the differences between pure air and polluted air.

Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into ________________.

Suggest a few measures for controlling carbon dioxide levels in the atmosphere.

The day-to-day condition of the atmosphere at a place with respect to the _______ is called the weather at that place.

Motor vehicles equipped with catalytic converter are advised to use unleaded petrol because

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

Combination of smoke and fog is called _____________.

Catalytic converters, which are fitted into automobiles for reducing the emission of poisonous gases possess which of the following metals as catalyst ?

Burning of fossil fuels is the main cause of release of ______ dioxide gas in air.

In countries near to polar region, the roads are sprinkled with CaCl2​. This is

In countries near to polar region, the roads are sprinkled with $C a C l_{2}$ . This is