1.A rectangular vessel of volume 100 cm * 60 cm * 200 cm is completelyfilled with a water. Neglecting atmospheric pressure: find the net force experienced by a metal foil placed at depth of 5 cm from the free surface. Why ist it 0? 2.If a cuboid is placed at some depth in water. My book says that the upper face experiences pressure due to the weight of the liquid column above it. But why does the lower face experience pressure. The water under it exerts force downwards due to gravity. Isnt it? My book says: Why upward. Pressure is scalar!!!! 3. If the tube of a faulty barometer is pushed down into the mercury trough, the barometric height will further decrease. Why does this happen? 4. Why does it get halved. What is the formula for magnetic strength>? What is meant by uniform magnetic field? 5. If I am provided with two similar bars, one is a magnet and the other is soft iron. How can I distinguish between them with out using any other thing?