21. Pressure is measured by-
22. It is easier to swim in a sea water than in ordinary water because
23. The separation of cream from milk by churning is due to
24. A liquid disturbed by string comes to rest due to
25. At which temperature density of water is maximum?
26. Which law/principle states that when a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it?
27. Which of the following statement(s) about a fluid at rest in a cup is/are correct?
1. Pressure is same at all the points in the fluid.
2. Pressure is exerted on the walls.
3. Pressure exists everywhere in the fluid.
1. Pressure is same at all the points in the fluid.
2. Pressure is exerted on the walls.
3. Pressure exists everywhere in the fluid.
28. Increasing the amount of a substance does not change its
29. Kerosene rises in the wick of the stove is due to
30. According to gas kinetic theory, the absolute zero temperature is achieved only when-
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