9th Class Chemistry Chapter 10 TestEnvironmental Chemistry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Fossils fuel is responsible for our ...... problem:

   1. Pollution

   2. Particles

   3. Matter

   4. None of these

2. A group of gases that maintains temperature of atmosphere is:

   1. Carbon dioxide and water vapours

   2. Nitrogen and carbon dioxide

   3. Oxygen and water vapours

   4. Nitrogen and oxygen

3. Why is smog not felt in summer?

   1. Because fog is not present in summer

   2. Because due to heat of the Earth the smoke rises up

   3. Because in summer smoke and fog cannot mix with each other

   4. Because less fossil fuels are burnt in summer 

4. SOx irritates the ......:

   1. Eyes

   2. Nose

   3. Blood 

   4. Lips

5. Buildings is being damaged by acid rain because it attacks:

   1. Calcium sulphate

   2. Calcium nitrate

   3. Calcium carbonate

   4. Calcium oxalate

6. Which gas has higher percentage in atmosphere:

   1. Carbon monoxide

   2. Argon 

   3. Oxygen

   4. Nitrogen

7. How many trees are there in the world?

   1. 3.21 trillion

   2. 3.04 trillion

   3. 3.21 million

   4. 3.04 million

8. Identify the minor constituents of air:

   1. Nitrogen

   2. Oxygen

   3. Carbon dioxide

   4. Argon

9. The pH of normal rain water is:

   1. 4-6

   2. 5-6

   3. 6-7

   4. 7-8

10. What is the main cause of increase in atmospheric CO₂ level?

    1. Burning of fossil fuels

    2. Deforestation

    3. Decomposition

    4. All of these