51. A boat full of iron nails is floating on water in a lake. When the iron nails are removed, the water level
52. Which one of the following substances possesses the highest elasticity?
53. What is the force exerted by water in upwards direction?
54. Kerosene oil floats on water because
55. If the depth of water in a dam is 'h' and 'A' is the transverse area of dam and 't' is the thickness of the dam. How, the pressure of dam wall depend on?
56. Assertion (A) The solids are more elastic and gases are least elastic.
Reason (R) It is so because for the given stress applied the gases are more compressible than that of solids.
Reason (R) It is so because for the given stress applied the gases are more compressible than that of solids.
57. Which of the following physicists explained the existence of Buoyant force?
58. The density of silver is 10.8 × 103 kgm-3 and the density of water is 103 kgm-3. What is the relative density of silver?
59. With the rise of temperature, the surface tension of a liquid
60. Virtually the force exerted on a vessel wall by a gas molecules.
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