Dust and Smoke

Q.

The diagram shows a section through the human heart.

What happens as blood is being pumped out of the heart?

1. 

2. 

3. 

4. 

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

1. False
2. True

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. ________ is made up of dust particles and gases.

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

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

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

Q. Smog is a mixture of smoke and fog.

1. True
2. False

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

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