[" 45.In the above question,the t2.7"m],[" to come again to the water surface is "],[[" (a) "2s," (b) "4s],[" (c) "6s," (d) "g_(s)]]

A plastic cube is released in water. Will it sink or come to the surface of water ?

Why does a block of plastic immersed under water come to the surface of water ?

What portion of ice floats above the surface the water?

A solid ball of density half that of water falls freely under gravity from a height of 20 m and then enters water. Up to what depth will the ball go ? How much time will it take to come again to the wate surface ? Neglect air resistance and viscosity effect in water.

In a pond of water, a flame is held 2 m above the surface of the water. A fish is at depth of 4 m from the water surface. Refractive index of water is (4)/(3) . The apparent height of the flame from the eyes of fish is -

In a pond of water, a flame is held 2 m above the surface of the water. A fish is at depth of 4 m from the water surface. Refractive index of water is (4)/(3) . The apparent height of the flame from the eyes of fish is -

Surface tension of water is T_(1) . When oil spreads on water surface tension becomes T_(2) , then

There is a leak proof cylinder of length 1m,made of a metal that has very low coefficient of expansion is floating vertically in water at 0^(@)C such that its height above the water surface is 20cm. If the temperature of water is increased to 4^(@)C , the height of the cylinder above the water surface becomes 21 cm. The density of water at T = 4^(@)C , relative to the density at T = 0^(@)C is approximately

There is a leak proof cylinder of length 1m,made of a metal that has very low coefficient of expansion is floating vertically in water at 0^(@)C such that its height above the water surface is 20cm. If the temperature of water is increased to 4^(@)C , the height of the cylinder above the water surface becomes 21 cm. The density of water at T = 4^(@)C , relative to the density at T = 0^(@)C is approximately