The document provides answers to 5 questions: 1) Vitamin D helps prevent rickets. 2) Mercury is used in thermometers to register minimum temperature. 3) The sky appears black to astronauts in space. 4) Sir Isaac Newton said "If I have seen further, it is by standing on the shoulders of giants." 5) The atomic number of oxygen is 8.

2. 1. Which vitamin helps to prevent
rickets?

3. Answer: Vitamin D

4. 2. What liquid is used in the
Thermometer, which registers
minimum temperature?

5. Answer : Mercury

6. 3. To an astronaut in space, what
colour does the sky appear to him?

7. Answer :Black

8. 4. Who said, “If I have seen further,
it is by standing on the shoulders
of giants”?

9. Answer: Sir Isaac Newton

10. 5. What is the atomic number of
Oxygen

11. Answer :Eight