Air

Samacheer Book Back Questions And Answers For Science Standard 8 “Air“

I. Choose the best answer:
1. Which of the following is true about oxygen?
a) Completely burning gas
b) Partially burning gas
c) Doesn’t support burning
d) Supports burning

2. Aerated water contains
a) air
b) oxygen
c) carbon dioxide
d) nitrogen

3. Solvay process is a method to manufacture
a) lime water
b) aerated water
c) distilled water
d) sodium carbonate

4. Carbon dioxide with water changes
a) blue litmus to red
b) red litmus to blue
c) blue litmus to yellow
d) doesn’t react with litmus

5. Which of the following is known as azote?
a) Oxygen
b) Nitrogen
c) Sulphur
d) Carbon dioxide

II. Fill in the blanks:
1. _____ is called as vital life.
2. Nitrogen is _____ than air.
3. _____ is used as a fertilizer.
4. Dry ice is used as a _____.
5. The process of conversion of iron into hydrated form of oxides is called _____.

Answers:
1. Oxygen
2. lighter
3. Nitrogen
4. refrigerant
5. rusting

III. Match the following:
1. Nitrogen                  A. Respiration in living animals
2. Oxygen                    B. Fertilizer
3. Carbon dioxide        C. Refrigerator
4. Dry ice                     D. Fire extinguisher

Answers:
1. B
2. A
3. D
4. C

Visit Our YouTube Channel For More Free Videos: Click Here