Jaggery is an unrefined sugar product made from sugarcane or palm sap. Being primarily composed of sucrose, it is highly soluble and readily dissolves in water.
12. Which of the following sinks in water?
(A) A boat
(B) A piece of paper
(C) A nail
(D) A stick
Answer:
(C) A nail
Explanation:
A solid iron or steel nail has a density significantly greater than that of water, causing it to sink immediately, whereas wood, paper, and hollow structures displace enough water to float.
13. Which of the following does not dissolve in water?
(A) Oil
(B) Milk
(C) Juice
(D) None
Answer:
(A) Oil
Explanation:
Oil is non-polar and hydrophobic (water-repelling). Because water is a polar molecule, the two liquids are immiscible and do not mix; the less dense oil will simply float on top of the water.
14. Salt is made from
(A) Sea Water
(B) Lake Water
(C) Fresh Water
(D) River Water
Answer:
(A) Sea Water
Explanation:
The vast majority of the world’s commercial salt is produced by trapping sea water in shallow, sunlit pans and allowing the water to naturally evaporate, leaving the crystalline salt behind.
15. Name the sea on which everything floats.
(A) Dead Sea
(B) Arabian Sea
(C) Red Sea
(D) None of these
Answer:
(A) Dead Sea
Explanation:
The Dead Sea has an extraordinarily high salinity level (almost ten times saltier than the ocean). This massive concentration of dissolved salt makes the water so dense that humans and objects naturally float on its surface.
