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The weight of a wooden block of size 8 * 8 * 8 cm is307.
2 g
. When it is floating in water, the height of the wooden block above water level is
4.8 cm
6 cm
4 cm
3.2 cm
A cylinder of height 20 m is completely filled withwater.
The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is
25.5
20
5
10
The ratio of the diameter of an air bubble at the bottom and at the surface is 1 : 2. If 1 atmosphere is equal to pressure of 10 m long water column, then the depth of the lake is
90 m
70 m
140 m
80 m
If two soap bubbles of different radii are connected by a tube
air flows from bigger bubble to the smaller bubble till the sizes are interchanged
there is no flow of air
air flows from the smaller bubble to the bigger
air flows from the bigger bubble to the smaller bubble till the sizes become equal
An ice cube containing a piece of lead floats inwater.
What would be the effect on the level of water if the ice cube melts
It would rise very high
It would fall
It would rise
It would remain the same
In a hydraulic lift at a service station, the radii of the large and small pistons are in the ratio of 20 : 1. What weight placed on the small piston will be sufficient to lift a car of mass 1200 kg
300 kfg
3000 kfg
30 kfg
3 kfg
A piece of brass
(Cu and Zn) weighs 12.9 g in water, it weighs 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1respectively.
The mass of copper in the alloy is
4.6 g
8.6 g
7.6 g
5.6 g
When a large bubble rises from the bottom of a lake to the surface, its radiusdoubles.
The atmospheric pressure is equal to that of a column of water of height H. The depth of the lake is
2 H
8 H
7 H
H
Two solids A and B float inwater.
It is observed that A floats with half of its volume immersed and B floats with 2 / 3 of its volumeimmersed.
The ratio of densities of A and B is
3 : 2
3 : 4
2 : 3
4 : 3
A piece of material weighing 50 g is coated with 6.3 g of wax of relative density 0.9. If the coated piece weighs 16.3 g in water, the density of the material is
6.2
1.515
2.3
4.8
Water is flowing through a tube of non-uniform cross-section.
If the radius of the tube at the entrance and exit is 3: 2, then the ratio of velocity of liquid entering and leaving the tube is
8: 27
1: 1
4: 9
9: 4
Water from inside the earth rises through the trunk of a big tree to leaves high up. The main reason for this is
high viscosity of water
capillary action
Gravitational Force
evaporation of water
A piece of solid weighs 120g in air, 80 g in water and 60 g in a liquid, then the relative density of the solid and that of liquid are respectively
3, 2
3, 3/2
2, 3/4
4, 3
Soldering of two metals is possible because of the property of
cohesion
surface tension
viscosity
Osmosis
A water tank on the top of a tall building feeds water in the taps on differentfloors.
The water will gush out at highest speed from a tap on floor
speed will be same on all the floors
near the middle of the building
narthest from the tank
nearest to the tank
Water flows along a horizontal pipe whose cross-section is notconstant.
The pressure is 1 cm of Hg where the velocity is 35 cm/s. At a point where the velocity is 65 cm/s, the pressure will be
1 cm of Hg
0.89 cm of Hg
0.5 cm of Hg
8.9 cm of Hg
Between layers of liquid in relative motion viscosity introduces
radial forces
intermolecular forces
adhesive forces
tangential forces
In a vessel of water a hole is made at a depth of 3.5 m from the freesurface.
The velocity of efflux will be
84 m/s
84 cm/s
8.4 cm/s
8.4 m/s
A body weighs 160 g in air and 130 g in water and 136 g inoil.
The specific gravity of oil is
1.3
3.2
0.8
1.6
The weight of wooden block of size 8 cm x 8 cm is307.
2 g. When it is floating in water the height of the wooden block above water level is
6 cm
4.8 cm
3.2 cm
4 cm
1
2
3
5
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