Dust & Smoke

Q. Match the following terms in Column - I with those in Column - II correctly.
$\begin{array}{cccc}& Column-I& & Column-II\\ a.& Aquaticanimals& 1.& Sailboat\\ b.& Mountaineers& 2.& Sootanddust\\ c.& Factories& 3.& Oxygencylinders\\ d.& Wind& 4.& Dissolvedoxygen\end{array}$

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

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

1. True
2. False

Q.

Statement I: Policemen regulating traffic at a crowded crossing often wear a mask.

Statement II: Mask filters carbon dioxide and sends pure oxygen inside.

1. Both statements are true

2. Both statements are false

3. Statement I is true and statement II is false

4. Statement I is false and statement II is true.

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

1. True
2. False

Q. Match the following terms in Column - I with those in Column - II correctly.
$\begin{array}{cccc}& Column-I& & Column-II\\ a.& Aquaticanimals& 1.& Sailboat\\ b.& Mountaineers& 2.& Sootanddust\\ c.& Factories& 3.& Oxygencylinders\\ d.& Wind& 4.& Dissolvedoxygen\end{array}$

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

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. ________ is made up of dust particles and gases.

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

Q.

Statement I: Policemen regulating traffic at a crowded crossing often wear a mask.

Statement II: Mask filters carbon dioxide and sends pure oxygen inside.

1. Both statements are true

2. Both statements are false

3. Statement I is true and statement II is false

4. Statement I is false and statement II is true.