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NEET Exam Model Paper 3
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© examsnet.com
Question : 12
Total: 180
If the work done in blowing a bubble of volume V is W, then the work done in blowing the bubble of volume 2V from the same soap solution will be
W
4
√
3
w
3
√
2
W
3
√
4
W
Validate
Solution:
Work done to form a soap bubble
W
=
8
π
R
2
T
(As
V
∝
R
3
∴
R
∝
V
1
3
)
∴
W
∝
V
2
3
W
2
W
1
=
(
V
2
V
1
)
2
3
=
(
2
)
2
3
⇒
W
2
=
(
4
)
1
3
W
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