XI Physics | New Book | Chapter 1 | Karachi Board | Numerical | Solved Part 3
7. One hectare is defined as 104 m2. One acre is 4 x 104 ft2. How many acres are in one hectare? (Hint: 1 m = 3.28 ft.) (2.69 acres)
8. A watch factory claims that its watches gain or lose not more than 10 seconds in a year. How accurate is this watch, express as percentage? (3.16x10-5 %)
9. The diameter of Moon is 3480 km. What is the volume of the Moon? How many Moons would be needed to create a volume equal to that of Earth?
(Hint: Radius of Earth = 6380 km) (2.2x1019 m3, 49.3)
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