## Surface energy-Basic

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. 8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is

•  1 : 10
•  1 : 15
•  1 : 20
•  1 : 25

1 : 20

Q2. 8 mercury drops coalesce to form one mercury drop, the energy changes by a factor of

•  1
•  2
•  4
•  6

4

Q3.  Which of the following statements are true in case when two water drops coalesce and make a bigger drop

•  Energy is released
•  Energy is absorbed
•  The surface area of the bigger drop is greater than the sum of the surface areas of both the drops
•  The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops

Energy is released The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops

Q4. If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is

•  W/2
•  2W
•  4W
•  7/3W

4W

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Surface energy-Basic