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NCERT Class VIII Science Solutions: Chapter 18 - Pollution of Air and Water Part 2
Question 8:
Potable water is the water which is
- Obtained from a river.
- Obtained from a lake.
- Pure and fit for drinking.
- Used
Answer: C
Question 9:
Which of the following procedures will give you water free from all impurities?
- Adding chlorine tablets
- Distillation
- Boiling
- Filtration
Answer: B
Question 10:
A pond contains clean water. Which of the following activities will produce least pollution of water?
- Washing clothes in the pond
- Animals bathing in the pond
- Washing motor vehicles in the pond
- Swimming in the pond.
Answer: D
Question 11:
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year.
The occasion is called
- Forest Conservation Day
- Plantation month
- Van Mahotsav
- Wildlife week
Answer: C
Question 12:
Which of the following is not a greenhouse gas?
- Nitrogen gas
- Water vapour
- Methane gas
- Carbon dioxide
Answer: A
VERY SHORT ANSWER QUESTIONS
Question 13:
Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air.
Answer:
Chlorofluorocarbons
Question 14:
Name any two sources which cause air pollution due to suspended particulate matter.
Answer:
- Combustion of fuel
- Industrial activities