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3. An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true

(a)  Bubble rises upwards because pressure at the bottom is less than that at the top.

(b)  Bubble rises upwards because pressure at the bottom is greater than that at the top.

(c)   As the bubble rises, its size increases

(d)  As the bubble rises, its size decreases

Ans. b,c

(5)

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