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Q.

What mass of lead will weigh as much as 8gm of iron, when both are immersed in water (Given specific gravities of iron and lead are 8 and 11 respectively).        

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a

1.1gm

b

2.2 gm

c

5.5 gm

d

7.7 gm

answer is D.

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Detailed Solution

For Iron :

11=w1w1−8

11w1−88=w1⇒w1=8.8 g  

For lead :

8=w1w1−w2=8.88.8−w2

8.8−w2=1.1⇒w2=7.7 g

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