Practice Test

Q1) Friction is always Show Answer

Q2) When two surfaces are coated with lubricant, friction between the surfaces Show Answer

Q3) Frictional force is Show Answer

Q4) Out of the following which is NOT a friction ? Show Answer

Q5) Friction is caused by Show Answer

Q6) Which of the following is a CORRECT statement ? Show Answer

Q7) The elevation of one surface gets _____ with depression in other surface. Show Answer

Q8) When one body tends to move or move over the another body, the opposition force depends upon Show Answer

Q9) The ball bearings used in a machine are of different materials, this is because Show Answer

Q10) When a moving body is suddenly stopped Show Answer

Q11) When a block is kept on the table. Its weight acts vertically downwards then the force exerted by the surface on the block is Show Answer

Q12) Friction between two bodies in contact when one body just move or tends to move over the other is called Show Answer

Q13) Choose the CORRECT relation. Show Answer

Q14) Coefficient of static friction doesnot depend upon Show Answer

Q15) If the normal reaction is doubled, the frictional force is Show Answer

Q16) The limiting force of static friction is approximately independent of Show Answer

Q17) A 4 kg block A is placed on the top of a block B of mass 8 kg, which rests on a smooth table. A just slips on B when a force of 12 N is applied on A. Then the maximum horizontal force required to make both A and B move together is Show Answer

Q18) The friction that exists between the surface of two bodies in contact when one body is sliding over the other is called Show Answer

Q19) Choose the CORRECT statement. Show Answer

Q20) A block of mass 4 kg resting on horizontal surface just can be kept in uniform motion on the horizontal surface by the application of the force 16 N, the coefficient of kinetic friction between the two surfaces is Show Answer

Q21) Both liquids and gases can flow hence they are called Show Answer

Q22) The pressure at a point in a fluid is independent of Show Answer

Q23) Static and homogeneous fluids are Show Answer

Q24) The ______ exerted by a liquid at rest per unit area normal to the surface in contact with the liquid is called pressure. Show Answer

Q25) Weight of the liquid column is given by Show Answer

Q26) Choose the CORRECT relation. Show Answer

Q27) The shape of the vessel containing, the liquid does not affect the pressure. This is known as Show Answer

Q28) The experiment demonstrated on hydrostatic paradox is carried out by Show Answer

Q29) Pascal's law is NOT applicable to Show Answer

Q30) Mercury column in the barometer has a height of _____ at sea level which is equivalent to one atmosphere. Show Answer

Q31) To measure pressure difference, a device used is Show Answer

Q32) Large variations of densities with change in pressure and temperature are exhibited by Show Answer

Q33) Liquid in the open tube manometer has _____ for measuring small pressure difference. Show Answer

Q34) Which of the following is NOT an application of Pascal's law ? Show Answer

Q35) Choose the CORRECT statement. Show Answer

Q36) The manual of a car instructs the owner to inflate the tyres to a pressure of 200 kPa., then the recommended gauge and absolute pressure respectively are Show Answer

Q37) Viscosity is the property of the liquids and gases which is more closely related to Show Answer

Q38) The kerosene and honey is poured on the inclined surface, kerosene flows down faster than honey because Show Answer

Q39) In stream line flow of liquid through a pipe of uniform cross sectional area, all streamlines are Show Answer

Q40) In streamline flow, the velocity of a liquid at a given point is Show Answer

Q41) For streamline flow of an incompressible fluid, If A is area and V is speed of then equation of continuity is Show Answer

Q42) An incompressible fluid flows steadily through a cylindrical pipe which has radius 2R at a point A and radius R at B. If the velocity at point A is v, its velocity at point B will be Show Answer

Q43) Out of the following statements select the WRONG statement. Show Answer

Q44) Flooded river is an example of Show Answer

Q45) When the velocity of flow of liquid is greater than critical velocity, the liquid is said to have Show Answer

Q46) The viscous force acting on adjacent layers of liquid is Show Answer

Q47) In streamline flow, the velocity of a liquid at the bottom layer is Show Answer

Q48) The rate of change of velocity with distance measured from stationary layer is called Show Answer

Q49) The velocity of liquid flowing through a tube at certain distance from the axis of tube Show Answer

Q50) A good lubricant must be Show Answer

Q51) Coefficient of viscosity of a liquid does not depend upon Show Answer

Q52) Two small spheres of radii r and 2r fall through a viscous liquid with the same constant speed. The viscous force experienced by them are in the ratio Show Answer

Q53) When a spherical body falls through a viscous fluid, it experiences a viscous force, the motion of the body is Show Answer

Q54) A small sphere is dropped into a medium of infinite extent. As the sphere falls, the net force acting on it Show Answer

Q55) For a streamline flow, Reynold number is Show Answer

Q56) If Reynold's number is greater than 3000, the flow of liquid is Show Answer

Q57) Bernoulli's principle is based on the principle of Show Answer

Q58) Bernoulli's principle is true under which of the following ( conditions) assumptions ? Show Answer

Q59) Water flowing through a horizontal pipe line having a constriction. Then Show Answer

Q60) In case of the streamline flow of non-viscous and incompressible fluid, following statement is CORRECT. Show Answer

Q61) Bernoulli's principle applies to stream line flow for which Reynold's number Show Answer

Q62) If P is the pressure on a liquid of area A and the liquid moves through a certain distances then work done per unit volume is Show Answer

Q63) The speed of the efflux from an open tank is identical to that of Show Answer

Q64) In a vessel containing water a hole is made at a depth of 0.10 m from the free surface. What would be the velocity of the efflux ? Show Answer

Q65) The device used to measure the rate of flow of incompressible fluid in steady state is Show Answer

Q66) In a venturimeter, ____ remains unchanged along the axis. Show Answer

Q67) The venturimeter measures the pressure difference by measuring Show Answer

Q68) In airfoil, the streamlines are crowded above the wings of aeroplane more than those below it. This causes ( during take off ) Show Answer

Q69) An airfoil has Show Answer

Q70) Which of the following is NOT an example of application of Bernoulli's principle Show Answer

Q71) A block of mass 0.2 kg is held against a wall by applying a horizontal force 5 N on the block. If coefficient of friction between the wall and the block is 0.6, the magnitude of frictional force acting on the block is Show Answer

Q72) With increase in temperature, friction Show Answer

Q73) The wheels are circular in shape because Show Answer

Q74) When loaded boat enters into the sea from a river, it rises because Show Answer

Q75) Sudden fall of atmospheric pressure by a large amount indicates Show Answer

Q76) A pipe 2 cm in diameter has a constriction of diameter 1 cm. What is the velocity of flow at the constriction, if velocity of flow in the broader region of the pipe is 5 cm/s ? Show Answer

Q77) Velocity of liquid layer is maximum at Show Answer

Q78) Velocity of efflux through an orifice is independent on Show Answer

Q79) The pressure applied to any part of the enclosed fluid at rest is transmitted undiminished to every portion of the fluid and to the walls of the vessel. This is
Show Answer

Q80) The method for measuring atmospheric pressure is devised for the first time by
Show Answer

Q81) Paint gun is based on
Show Answer

Q82) The velocity of efflix of liquid through orifice is equal to velocity which a body attains while falling freely from the free surface of liquid to the orifice. This is known as
Show Answer

Q83) The practical SI unit of pressure and its dimensions are Show Answer

Q84) One atmospheric pressure or pressure on free surface of liquid is given by Show Answer

Q85) Select the CORRECT statement Show Answer

Q86) An incompressible liquid flowing through a uniform cross sectional tube with velocity 12 cm/s. If the thickness of liquid layer is 0.8 cm than velocity of gradient of flow is Show Answer

Q87) The SI unit and dimensions of velocity gradient in streamline flow is Show Answer

Q88) The SI unit and dimension of coefficient of viscosity are Show Answer

Q89) The relation between SI and C.G.S. unit of coefficient of viscosity is Show Answer

Q90) A glass plate of length 8 cm and breadth 6 cm slides with uniform velocity of 2.5 cm/s on a layer of glycerine, 1 mm thick, when a horizontal force of 0.25 N is applied to the plate. The coefficient of viscosity of glycerine is Show Answer

Q91) Viscous force on a small sphere of radius R moving in a fluid varies directly with Show Answer

Q92) Torricelli's law is given by ( mathematically) Show Answer

Q93) Critical velocity is given by Show Answer

Q94) Two drops of equal size are falling vertically through air with a constant terminal velocity of 0.15 cm/s. What should be the velocity if these drops coalesce, to form one drop ? Show Answer

Q95) Which of the following is correct formula for terminal velocity of a body in a viscous liquid ? Show Answer

Q96) A stone weighing 1 kg sliding on ice with a velocity of 2 m/s is stopped by friction in 10 s. The force of friction ( assume to be constant) will be Show Answer

Q97) The densities varies very little over a wide range in pressure and temperature in case of __________ hence treated as incompressible. Show Answer