11. If two bubbles of soap of different diameter come in contact with a tube, then what will happen?
12. What is the upward pressure generated by an object being placed on a fluid?
13. Soap bubble attains spherical shape due to . . . . . . . .
14. A needle sinks in water whereas a ship made of iron floats on it because
15. How does a blotting paper absorbing ink?
16. Consider the figure of a fountain with four holes, given below.
Which one of the holes in the fountain will throw the water farthest?
Which one of the holes in the fountain will throw the water farthest?
17. Match the columns.
Column I
Column II
a. Linear strain
1. Change in the shape without changing its volume
b. Volumetric strain
2. Change in length alone
c. Shearing strain
3. Change in volume
d. Young's modulus
4. Ratio of normal stress to longitudinal strain
| Column I | Column II |
| a. Linear strain | 1. Change in the shape without changing its volume |
| b. Volumetric strain | 2. Change in length alone |
| c. Shearing strain | 3. Change in volume |
| d. Young's modulus | 4. Ratio of normal stress to longitudinal strain |
18. A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of . . . . . . . .
19. An iron needle floats on the surface of water due to
20. When an object sinks, the up thrust of the fluid on the object is:
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