Particulate Matter

Q.

Explain the difference between pure air and polluted air.

Q. The substances which contaminate air are called __________.

1. air particles
2. dust particles
3. air pollutants
4. smog

Q.

Question 21
Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by___ substances which have a ___ effect on both the ___ and ___, it is referred to as ___. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ___ are responsible for causing ___ pollution. Petroleum ___ are a major source of ___ pollutants like ___ and ___. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ___ your teeth, leaving the ___ running may waste several ___ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for ___ is called ___ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ___and ___ impurities. (insects, microorganism, particles, dissolved, harmful).

Q. Identify the sources of air pollution from the given options.

1. Pesticides
2. Vehicles
3. Chemical fertilizers
4. Industries

Q. Fill in the blanks with the help of words given in bracket after each sentence. ​

​

(a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________.​

(air pollution, harmful, living, unwanted, non-living, pollutants). ​

(b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. ​

(sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air)

(c) While ________ your teeth, leaving the ________ running may waste several ________ of water. ​

(tap, liters, brushing, washing, drops)

(d) Water which is suitable for _________ is called ________ water. ​

(washing, bathing, drinking, potable, soft)

(e) Water which looks clean still has disease-carrying ________ and ________ impurities. ​

(insects, microorganisms, particles, dissolved, harmful).

Q. Explain the difference between pure air and polluted air? [2 marks]

Q. It is important to use unleaded petrol over leaded petrol.

1. True
2. False

Q.

Pollution causes a change in the environment.

1. True

2. False

Q. Explain the differences between pure air ​and polluted air. [2 marks]

Q.

Explain the difference between pure air and polluted air.

Q.

Which of the following describes the difference between pure air and polluted air?

1. Polluted air contains carbon dioxide whereas pure air does not.

2. Amount of carbon monoxide is much more in polluted air than pure air.

3. Pure air contains only oxygen gas.

4. Amount of sulphur dioxide and nitrogen dioxide is much more in polluted air than pure air.

Q. Answer the following with one word.
1. Most abundant gas is
2. Most important gas for respiration is
3. Most dangerous gas among air pollutants is
[3 MARKS]

Q. Air pollution can lead to which of the following?

1. Allergies
2. Smog
3. Contamination of water bodies
4. Contamination of soil

Q. Identify the sources of air pollution from the given options.

1. Pesticides
2. Vehicles
3. Chemical fertilizers
4. Industries

Q. It is environmentally important to use unleaded petrol over leaded petrol.

1. True
2. False

Q.

Pollution of air is caused due to _______.

1. particulate matter

2. poisonous gases and particulate matter

3. poisonous gases

4. colloids

Q.

Harmful chemicals released out from the chemical factories cause air pollution.

1. False

2. True

Q. What do you meant by air pollutants? [4 marks]

Q.

Name some common particulates.