👉11. Which of the following explain the reasons why there is no total eclipse of the sun?
✒ *Ans* Area of the sun covered by the moon
👉12. The instrument used to measure the specific gravity of milk is?
✒ *Ans* Lactometer
👉13. The internal antenna of transistor set is made of ?
✒ *Ans* Ferror Chrome
👉14. Gerontology is the study of ?
✒ *Ans* Process of ageing
👉15. Helium is used for respiration in deep water instead of nitrogen because
✒ *Ans* It is heavier than nitrogen
👉16. In a fluorescent tube which of the following components are found?
✒ *Ans* Mercury vapour
👉17. The common ore of aluminium is ?
✒ *Ans* Chromite
👉18. When one enters a dark room, he is not able to see anything but, after sometime vision improves. This is because ?
✒ *Ans* The pupil ofthe eye dilates
👉19. Radio carbon dating is used to find the age of ?
✒ *Ans* Fossils
👉20. What is periscope used for ?
✒ *Ans* To survey the ships on the surface of the sea when the submarine is under water
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