NTS Everyday Science Concepts 2

Question 1

Which vitamin is produced by the human body when exposed to sunlight?

Accepted Answer

Vitamin D

Answer

Vitamin D is synthesized in the skin when exposed to ultraviolet B (UVB) radiation from sunlight.

Question 2

What is the chemical formula of water?

Accepted Answer

H₂O

Answer

Water's chemical formula is H₂O, consisting of two hydrogen atoms and one oxygen atom.

Question 3

Which planet is known as the 'Red Planet'?

Accepted Answer

Mars

Answer

Mars is called the Red Planet due to iron oxide (rust) on its surface giving it a reddish appearance.

Question 4

What is the boiling point of water at sea level?

Accepted Answer

100°C

Answer

Water boils at 100°C (212°F) at standard atmospheric pressure at sea level.

Question 5

Which gas do plants absorb during photosynthesis?

Accepted Answer

Carbon Dioxide

Answer

Plants absorb carbon dioxide (CO₂) from the atmosphere and use it with water and sunlight to produce glucose and oxygen.

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