Which is the main gas that makes up the Earth's atmosphere?
Oxygen
Nitrogen
Carbon Dioxide
Hydrogen
What is the biggest planet in our solar system?
Uranus
Earth
Jupiter
Saturn
How many teeth does an adult human have?
20
32
25
37
What modern-day country was Marie Curie born in?
Poland
France
South Africa
Argentina
Chlorophyll is a naturally occurring chelate compound in which central metal is
Copper
Iron
Magnesium
Calcium
Which of the gas is not known as green house gas?
Methane
Nitrous oxide
Carbon dioxide
Hydrogen
The average salinity of sea water is
3%
3.5%
4%
5%
The element common to all acids is
Hydrogen
Carbon
Sulphur
Oxygen
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