Related InterviewSolutions

• In a Bramah press a small force is used to spend a much larger force. This is accomplished byA. increasing the area of cross section of the pump piston.B. decreasing the area of cross section of the press piston.C. increasing the area of cross section of the press piston.D. increasing the long (weight) on the press piston.
• Pressure at a point inside a liquid does not depend on theA. density of the liquidB. height of the liquid column above the point.C. acceleration due to gravityD. base area of the container.
• Arrange the following steps in proper sequence to determine the relative density of liquid by using a constant immersion hydrometer. (a) The test tube is made to float in the given liquid. (b) The weight of the test tube with lead shots in air is determined `(W_(1))`. ( c) The depth of the test tube immersed in water (h) is determined. (d) The test tube is made to float in water. (e ) Lead shots are added or removed from the test tube such that the test tube is immersed to the same depth (h) in the given liquid. (f) The relative density of the liquid is measured as `(W_(1))/(W_(1))`. (g) The test tube is taken out from the given liquid and its weight `(W_(2))` is measured.A. b d c a e g fB. b d c a e f gC. b g f e a c dD. b a d c e f g
• The weight of a constant immersion hydrometer is 15 gwt. When it is immersed in a liquid, few more lead shots were added to it so that it floats at the same depth as in water. If the weight of the hydrometer now is 20 gwt, find its relative density.
• Calculate the depth of water at which a bubble of air would just float. Density of water `=1000 kg^(-3)` and density of air `= 1.29 kg ^(-3)`. Atmospheric pressure =`10^(5)` pa.
• An air bubble rises up in water because,A. there is no gravity in water.B. pressure inside the bubble is less than the pressure outside it.C. the upthrust acting on the bubble is more than the weight of the bubble.D. air cannot dissolve in water.
• A long metal rod of length I and density p is held vertically with its lower end touching sea-water of density `p_(0)`. Calculate the time in which the whole of the rod will sink into water and the velocity of the rod. Negtect water resistance and assume vertical postion of the rod throughout its motion .
• The roof of a house blows out during a storm becauseA. the wind blows with high velocity under the roof.B. the weight of the roof is less than the weight of an equal volume of air.C. the wind blows with high velocity over the roof, causing an upthrust on the bottoms side.D. the wind blows with high velocity over the roof, causing low pressure under the roof.
• A tube 1.5 m long and closed at on end is half filled with mercry and is then inverted with its open ends just dipping into a mercury tough.Find the height of mercury in the tube if the reading of the barometer is 0.75 m.
• A piece of nail sinks in water but a boat floats in it becauseA. there is no upthrust acting on the nail.B. a nail is heavier than a boat .C. a nail has a pointed end.D. upthrust acting on the nail is less than its weight.