Dust and Smoke

Q.

Question 7

The components of air which are harmful to living beings are :

a) Nitrogen.

b) Water vapour.

c) Dust and smoke.

d) Carbon dioxide.

Q.

Long chimneys in factories are to ________.

1. make it beautiful

2. increase the efficency of factory

3. release harmful smoke high in the atmosphere

4. reduce the cost of production

Q.

Question 14.3

Observe the picture given in Fig. carefully and answer
the following questions.

Can you comment on air quality of the place shown in
the Fig.?

Q. Which type of air does not contain water vapour?

1. Moist air
2. Polluted air
3. Warm air
4. Dry air

Q.

Question 20

On a Sunday morning Paheli’s friend visited her home. She
wanted to see some flowering plants in the nearby garden.
Both of them went to the garden. While returning from the
garden they also observed some flowering plants on the road
side. But to their surprise they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?

Q.

Question 14.2

Observe the picture given in Fig. carefully and answer
the following questions.

Why is he putting a cover on his nose?

Q. ________ is made up of dust particles and gases.

1. Smoke
2. Water vapour
3. Rain drops
4. Hail

Q.

Long chimneys in factories are to ________.

1. make it beautiful

2. increase the efficency of factory

3. release harmful smoke high in the atmosphere

4. reduce the cost of production

Q. How can we say that oxygen is dissolved in soil and water?(explaination with diagram)

Q.

The quality of air at various locations is monitored regularly by the government and other agencies? In what way can you use these data?

Q. Give reasons for the following: [5 marks]
a) Mountaineers carry cylinders with them while climbing high mountains.
b) We feel suffocated in a closed room where something is burning.
c) Why do factories have long chimneys?

Q.

Question 17.4

Explain the following observations very briefly

Breathing through mouth may harm you.

Q. Why should you breathe through your nose and not your mouth?

Q.

Why is air called a breath of life?

Q.

Name some air pollutants.

Q.

19 Unravel these jumbled sentences to find the one that is not a good method to prevent air pollution.

1. vride ynlo nehw oyu stmu

2. lkaw rtosh sidntacse

3. ntalp orme eerst

4. urnb riedd eavlse

Q.

Sam was impressed by John's quick answer and asked him another question somewhat related to the previous question itself.

Sam: John, now that you know so much about air around us, can you tell us which components of air is harmful for living beings?

John: I am not exactly sure about this, Kenneth, please help me answer this.

Kenneth: Oh yes, I can surely help you answer this question.

What was Kenneth's answer?

1. Nitrogen and carbon dioxide

2. Dust and smoke

3. Dust and water vapour

4. Smoke and water vapour

Q.

Match the following terms in Column - I with those in Column - II correctly.

Column I	Column II
(a) Aquatic animals	(1) Sailboat
(b) Mountaineers	(2) Soot and dust
(c) Factories	(3) Oxygen cylinders
(d) Wind	(4) Dissolved oxygen

1. a-1, b-2, c-3, d-4

2. a-2, b-1, c-4, d-3

3. a-3, b-4, c-1, d-2

4. a-4, b-3, c-2, d-1

Q.

Give a reason for dust and smoke being more prevalent in cities than in villages.

Q. Fill in the blank with the most appropriate word.
I'm afraid Mr Brown's been _________ on business.

1. put on
2. called for
3. got in
4. called away

Q. ________ is made up of dust particles and gases.

1. Smoke
2. Water vapour
3. Rain drops
4. Hail

Q. Smog is a mixture of smoke and fog.

1. True
2. False

Q. Pollens floating in air do not cause any air pollution.

Q. People wear masks so that they can save themselves from inhaling the polluted air.

1. False
2. True

Q. Near polluted areas, the percentage of which of the following gases is higher than normal?

1. Oxygen
2. Carbon dioxide
3. Nitrogen
4. Argon

Q. Jet aeroplanes release the pollutants in air called:

1. photochemical oxidants
2. smog
3. fly ash
4. aerosols

Q. Which among the following is made up of dust particles and gases?

1. Hail
2. Smoke
3. Water vapour
4. Raindrops

Q. Which among the given help to reduce air pollution ?

1. Use of crackers
2. Planting trees
3. Use of bicycles
4. Electric cars
5. Carpooling
6. Private vehicles
7. Use of CNG
8. Unleaded petrol

Q. _______ pollution is caused due to the presence of harmful substances in air.

1. Air
2. Noise
3. Soil
4. Water

Q. ________ is made up of dust particles and gases.

1. Rain drops
2. Smoke
3. Water vapour
4. Hail