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

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 5

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 6

Combination of smoke and fog is called _____________.

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Question 7

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 8

How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.

Accepted Answer

Catalytic converters have expensive metals like platinum, palladium, and rhodium as catalysts. As exhaust emission passes through the catalytic converter, unburnt hydrocarbons are converted into carbon dioxide and water, while carbon monoxide and nitric oxide are changed to carbon dioxide and nitrogen gas. Unleaded petrol is the best fuel for automobiles fitted with catalytic converters to reduce air pollution.

Question 9

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 10

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

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Revise with Concepts

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

Euro Bharat Vehicular Pollution

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.

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

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

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 ?

How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.

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:

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

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.

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

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

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 ?

How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.

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:

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