Advertisements
Advertisements
प्रश्न
Air is an important inexhaustible natural resource. It is essential for the survival of human beings, microbes, plants, and animals. The following table shows the percentage of various gases in the air.
| Contents of air | Percentage (by volume) |
| Nitrogen | 78 |
| Oxygen | 21 |
| Other (carbon dioxide, inert gases, water vapours, etc.) | 1 |
In 800 m3 of air, calculate the approximate quantities of nitrogen, oxygen, and other gases.
Advertisements
उत्तर
Nitrogen in air = 78%, Oxygen = 21%, Others = 1%
Quantity of air = 800 m3
∴ Quantity of nitrogen in it = 800 of 78%
= `800xx78/100"m"^3`
= 624 m3
∴ Quantity of oxygen = 800 of 21%
= `800xx21/100"m"^3`
= 168 m3
∴ Quantity of other gases = 800 of 1%
= `800xx1/100"m"^3`
= 8 m3
APPEARS IN
संबंधित प्रश्न
Express the following as decimal fractions:
7.5%
Find the number a, if 0.5% of a is 3
A bag contains 8 red balls, 11 blue balls and 6 green balls. Find the percentage of blue balls in the bag.
What percent is: 25 cm of 4 metres
A tin contains 20 litres of petrol. Due to leakage, 3 litres of petrol is lost. What percent is still present in the tin?
When Mathi was buying her flat she had to put down a deposit of `1/10` of the value of the flat. What percentage was this?
There are 500 students in a rural school. If 370 of them can swim, what percentage of them can swim and what percentage cannot?
An average urban Indian uses about 150 litres of water every day.
| Activity | Litres per person per day |
| Drinking | 3 |
| Cooking | 4 |
| Bathing | 20 |
| Sanitation | 40 |
| Washing clothes | 40 |
| Washing utensils | 20 |
| Gardening | 23 |
| Total | 150 |
What per cent of water is used for drinking, cooking and gardening together?
120% of 50 km = ______.
15 kg is ______ % of 50 kg.
