### Class XI

The specific gravity of a material is
1. the ratio of its mass to the mass of water
2. the ratio of its volume to the density of water
3. the ratio of its density to the density of water
4. the ratio of its mass to the density of water
The units of pressure in SI system is
1. Pascal
2. Newton
3. Watt
4. Joule
According to Pascalâ€™s Law the
1. pressure in a fluid at rest is the same at all points if they are at the same height
2. pressure in a fluid increases with temperature
3. pressure in a fluid decreases with temperature
4. pressure in a fluid at rest is the same at all points if they are at different heights
In a hydraulic lift the force applied on the smaller cylinder of area A1 is F1. If the area of the larger cylinder is A2 the maximum weight that can be lifted is
1. F1
2. A2A1F1
3. F1A2
4. F1A
in laminar flow
1. adjacent layers of fluid move in circle crossing each other each other and the flow is steady
2. adjacent layers of fluid slide smoothly past each other and the flow is unsteady
3. adjacent layers of fluid do not slide smoothly past each other and the flow is unsteady
4. adjacent layers of fluid slide smoothly past each other and the flow is steady
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