The fraction of a floating object of volume and density above the surface of a liquid of density d will be
1.
2.
3.
4.
A body is just floating on the surface of a liquid. The density of the body is the same as that of the liquid. The body is slightly pushed down. What will happen to the body?
1. | It will slowly come back to its earlier position |
2. | It will remain submerged, where it was left |
3. | It will sink |
4. | It will come out violently |
A cork is submerged in water by a spring attached to the bottom of a bowl. When the bowl is kept in an elevator moving with acceleration downwards, the length of spring
1. Increases
2. Decreases
3. Remains unchanged
4. None of these
A hollow sphere of volume V is floating on water surface with half immersed in it. What should be the minimum volume of water poured inside the sphere so that the sphere now sinks into the water ?
1. V/2
2. V/3
3. V/4
4. V
A ball whose density is falls into water from a height of 9 cm . To what depth does the ball sink
1. 9 cm
2. 6 cm
3. 4.5 cm
4. 2.25 cm
If two pieces of metal when immersed in a liquid have equal upthrust on them, then:
1. | Both pieces must have equal weights |
2. | Both pieces must have equal densities |
3. | Both pieces must have equal volumes |
4. | Both are floating in the same depth |
In which one of the following cases will the liquid flow in a pipe be most streamlined ?
1. Liquid of high viscosity and high density flowing through a pipe of small radius
2. Liquid of high viscosity and low density flowing through a pipe of small radius
3. Liquid of low viscosity and low density flowing through a pipe of large radius
4. Liquid of low viscosity and high density flowing through a pipe of large radius
An incompressible liquid flows through a horizontal tube as shown in the following fig. Then the velocity v of the fluid is
1. 3.0 m/s
2. 1.5 m/s
3. 1.0 m/s
4. 2.25 m/s
The following fig. shows the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the:
1. | Height of the liquid in the tube A is maximum |
2. | Height of the liquid in the tubes A and B is the same |
3. | Height of the liquid in all the three tubes is the same |
4. | Height of the liquid in the tubes A and C is the same |
A manometer connected to a closed tap reads . When the valve is opened, the reading of manometer falls to , then velocity of flow of water is
1. 100 m/s
2. 10 m/s
3. 1 m/s
4. m/s