Tiêu đề 11. Fluid Mechanics Med.pdf ✅

(1.) Pressure applied to an enclosed fluid is transmitted undiminished to every point of the fluid and the walls of containing vessel. This law was first formulated by (a.) Reynolds (b.) Bernoulli (c.) Pascal (d.) Torricelli (2.) Pressure is a scalar quantity because (a.) It is the ratio of force to area and both force and area are vectors. (b.) It is the ratio of the magnitude of the force to area. (c.) It is the ratio of the component of the force normal to the area. (d.) It depends on the size of the area chosen. (3.) Hydraulic breaks are based on (a.) Pascal’s law (b.) Torricelli’s law (c.) Newton’s law (d.) Boyle’s law (4.) Two syringes of different cross section (without needle) filled with water are connected with a tightly fitted rubber tube filled with water. Diameters of the smaller piston and larger piston are 1 cm and 3 cm respectively. If a force of 10 N is applied to the smaller piston then the force exerted on the larger piston is (a.) 30 N (b.) 60 N (c.) 90 N (d.) 100 N (5.) In question number 6, if the smaller piston is pushed in through 6 cm, how much does the longer piston move out ? (a.) 2 cm 3 (b.) 3 cm 2 (c.) 1 cm 3 (d.) 1 cm 2 (6.) Pressure at a point inside a liquid does not depend on (a.) The nature of the liquid. (b.) Shape of the container. (c.) The depth of point below the surface of the liquid. (d.) Acceleration due to gravity at that point. (7.) Which of the following instrument is used to measure the blood pressure in humans? (a.) Sphygmomanometer (b.) Spectrophotometer (c.) Spectrometer (d.) Barometer (8.) Two what height should a cylinderical vessel be filled with a homegeneous liquid to make the force with which the liquid pressure on the sides of the vessel equal to the force exerted by the liquid on the bottom of the vessel ? (a.) Equal to the radius (b.) Less than radius (c.) More than radius (d.) Four times of radius (9.) A tank with a square base of area 2 2 m is divided into two compartments by a vertical partition in the middle. There is a small hinged door of face area 20 2 cm at the bottom of the partition. Water is filled in one compartment and an acid of relative density 1.5 in the other, both to a height of 4 m. The force necessary to keep the door closed is (Take 2 g ms 10 − = )
(a.) 10 N (b.) 20 N (c.) 40 N (d.) 80 N (10.) Streamline flow is more likely for liquids with (a.) High density and high viscosity (b.) Low density and low viscosity (c.) High density and low viscosity (d.) Low density and high viscosity (11.) Which of the following diagrams does not represent a streamline flow? (a.) (b.) (c.) (d.) (12.) When the flow parameters of any given instant remain same at every point, then flow is said to be (a.) Laminar (b.) Steady state (c.) Turbulent (d.) Quasistatic (13.) An ideal flow of any fluid must satisfy (a.) Pascal law (b.) Stokes’s law (c.) Continuity equation (d.) Bernoulli’s theorem (14.) The pressure at depth below the surface of a liquid of density  open to the atmosphere is (a.) Greater than the atmospheric pressure by gh (b.) Less than the atmospheric pressure by gh (c.) Equal to the atmospheric pressure (d.) Increases exponentially with depth (15.) Which of the following device is used to measure the rate of flow of liquid through a pipe? (a.) Thermometer (b.) Barometer (c.) Manometer (d.) Venturimeter (16.) In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from
(a.) Pascal’s law (b.) Stoke’s law (c.) Bernoulli’s principle (d.) Archimede’s principle (17.) Which of the following figure shown below is correct regarding the steady flow of a non viscous liquid? (a.) (b.) (c.) (d.) (18.) A liquid flows through a horizontal tube as shown in figure. The velocities of the liquid in the two sections, which have areas of cross-section A1 and 2 A , are 1 v and 2 v , respectively. The difference in the levels of the liquid in the two vertical tubes is h. Then (a.) 2 2 2 1 v v gh − = 2 (b.) 2 2 2 1 v v gh + = 2 (c.) 2 2 2 1 v v gh − = (d.) 2 2 2 1 v v gh + = (19.) An open vessel containing water is given a constant acceleration a in the horizontal direction. Then the free surface of water gets sloped with the horizontal at an angle  given by (a.) 1 tan a g  −   =     (b.) 1 tan g a  −   =     (c.) 1 tan a g  −   =     (d.) 1 cos g a  −   =     (20.) A tank filled with fresh water has a hole in its bottom and water is flowing out of it. If the size of the hole is increased, then (a.) The volume of water flowing out per second will decrease (b.) The velocity of out flow of water remains Unchanged (c.) The volume of water flowing out per second remains zero (d.) Both (b) and (c)
(21.) A body of mass 100 kg and density 3 500kg m− floats in water. The additional mass should be added to the body so that the body will sink is (a.) 80 kg (b.) 100 kg (c.) 150 kg (d.) 200 kg (22.) Applications of Bernoulli’s theorem can be seen in (a.) Dynamic lift of aeroplane (b.) Hydraulic press (c.) Helicopter (d.) None of these (23.) A man is sitting in a boat which is floating in a pond. If the man drinks some water from the pond, the level of water in the pond (a.) Increases (b.) Decreases (c.) Remains unchanged (d.) Increases are decreases depends upon the weight of man (24.) An ice block having two similar metallic pieces is floating in water in a vessel as shown in figure. After sometime the ice melts completely then (a.) The water level rises in the vessel (b.) The water level falls in the vessel (c.) The water level does not change in vessel (d.) The water level may rise of fall depending upon the ratio of masses of ice and metallic pieces. (25.) A water barrel stands on a table of height h. If a small hole is punched in the side of the barrel at its base, it is found that the resultant stream of water strikes the ground at a horizontal distance R from the table. What is the depth of water in the barrel ? (a.) 2 R h (b.) 2 2 R h (c.) 2 4 R h (d.) 2 4R h (26.) A body is just floating on the surface of liquid. The density of the body is same as that of the liquid. The body is sligtly pushed down. Then it will (a.) Come back slowly to its earlier position (b.) Remain submerged where it is left. (c.) Sink in liquid (d.) Come out vigoursly (27.) Dynamic lift due to spinning is (a.) Magnus effect (b.) Doppler effect (c.) Pascal effect (d.) Torricelli’s effect