Practice Test

Q1) Which of the following metals is liquid at room temperature ? Show Answer

Q2) The force between atoms and molecules is Show Answer

Q3) The intermolecular forces are Show Answer

Q4) The bulk modulus of a fluid is inversely proportional to Show Answer

Q5) The shearing stress produces a change in Show Answer

Q6) A wire can support a weight of 40 kg wt, before it will break. If the wire is cut into two equal parts, each part can support a weight of Show Answer

Q7) Soap helps in cleaning clothes, because Show Answer

Q8) Viscosity is the internal property of the liquids and gases. It is more closely related to Show Answer

Q9) The breaking stress of a wire depends on Show Answer

Q10) A wire can be broken y 100 kgf. The load required to break the wire of double the thickness of same material will be Show Answer

Q11) For pure water and clean glass, the angle of contact is Show Answer

Q12) For ordinary water and clean glass, the angle of contact is about Show Answer

Q13) It is difficult to write legibly with a fountain pen on a newspaper, because of Show Answer

Q14) When there are no external forces, the shape of a liquid drop is determined by Show Answer

Q15) In the case of streamline flow, the loss of energy is Show Answer

Q16) Cough syrup flows sluggishly because of Show Answer

Q17) If you float on your back on water, your weight is Show Answer

Q18) A body floats in water, such that 0.3 of its volume is outside. The relative density of the body is Show Answer

Q19) The dimensional formula of surface energy is Show Answer

Q20) The angle of contact for a liquid which wets glass surface is Show Answer

Q21) The surface tension of a liquid can be expressed in Show Answer

Q22) Four-fifths of a cylindrical block of wood floats inside a liquid. If the relative density of wood is 0.8, what is the relative density of the liquid ? Show Answer

Q23) The relative density of ice is 0.9 and that of sea water is 1.125. What fraction of the whole volume of an iceberg appears above the surface of the sea ? Show Answer

Q24) The angle of contact for a liquid that does not wet the solid which is in contact with it, is Show Answer

Q25) A bird weighing 1 kg is sitting on the base of a wire-mesh cage weighing 0.5 kg. The bird starts flying inside the cage. The weight of the bird-cage assembly will now be Show Answer

Q26) The instrument used by navigators is Show Answer

Q27) equal masses of water and a liquid of density 2 are mixed together, then the mixture has a density of Show Answer

Q28) The volume of 2.5 moles of gas at S.T.P. is Show Answer

Q29) A ship is floating in sea water. On entering the harbour, the ship will Show Answer

Q30) If we dip capillary tubes of different radii r in water then the height h to which the water will rise is such that Show Answer

Q31) The ratio of the SI units to the C.G.S. units of surface tension is Show Answer

Q32) SI unit of buoyant force is Show Answer

Q33) An iron needle placed slowly on the water floats on it because Show Answer

Q34) When a body is a wholly or partially immersed in a liquid it appears to lose weight. This lose of weight is equal to the weight of : Show Answer

Q35) Two pieces of metal when immersed in a liquid have equal upthrust on them; then : Show Answer

Q36) If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect : Show Answer

Q37) A body floats in a liquid contained in a breaker. The whole system falls freely under gravity. The uptrust on the body due to the liquid as : Show Answer

Q38) When a body is weighed in a liquid, the loss in its weight depends upon : Show Answer

Q39) Which of the following would a hydrogen balloon find easier to lift ? Show Answer

Q40) A hydrogen balloon released on the moon would Show Answer

Q41) An iron ball is weighed in air and then in water by a spring balance : Show Answer

Q42) An iceberg is floating partially immersed in sea water. If the density of sea water is 1.03 g/cc and that of ice is 0.92 g/cc, the fraction of the total volume of iceberg above the level of sea water is : Show Answer

Q43) For a body floating in water the apparent weight is equal to : Show Answer

Q44) A wooden cylinder floats vertically in water with half of its length immersed. The density of wood is : Show Answer

Q45) Two solids A and B floats in a liquid. It is observed that A floats with half its volume immersed and B floats with (2/3) of its volume immersed. Compare the densities of A and B : Show Answer

Q46) A body floats with (1/3) of its volume outside water and (3/4) of its volume outside another liquid. The density of the other liquid is : Show Answer

Q47) A vessel contains oil (density 0.8 g/cc) over mercury (density 13.6 g/cc). A homogeneous sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of the sphere in g/cc is : Show Answer

Q48) A U-tube of uniform cross-section is partially filled with a liquid I. Another liquid II which does not mix with liquid I is poured into one side. it is found that the liquid levels of the two sides of the tube are the same while the level of liquid I has risen by 2 cm. If the specific gravity of liquid I is 1.1, the specific gravity of liquid II must be : Show Answer

Q49) The height to which a cylindrical vessel be filled with a homogeneous liquid, to make the average force with which the liquid presses the side of the vessel equal to the force exerted by the liquid on the bottom of the vessel, is equal to : Show Answer

Q50) Pressure is applied to an enclosed fluid. It is: Show Answer

Q51) Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by : Show Answer

Q52) The most characteristic property of liquids is Show Answer

Q53) A boat having a length of 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is Show Answer

Q54) The ratio of SI unit of CGS unit of buoyant force is Show Answer

Q55) A parrot sitting on the floor of a wire cage which is being carried by a boy, starts flying. The boy will feel that the box is now Show Answer

Q56) Which one of the following would hydrogen balloon find easiest to lift ? Show Answer

Q57) A block of steel of size 5 cm X 5 cm X 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is Show Answer

Q58) An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will Show Answer

Q59) A body floats with one-third of its volume outside water and 3/4 of its volume outside another liquid. The density of the other liquid is Show Answer

Q60) A body is just floating in a liquid (their densities are equal). If the body is slightly pressed down and released, it will Show Answer

Q61) An atmosphere Show Answer

Q62) 1 kg each of cotton and iron are weighed in vacuum, then Show Answer

Q63) A boat floating in a tank is carrying a number of large stones. if the stones are unloaded into water, what will happen to the water level ? It will Show Answer

Q64) 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 Show Answer

Q65) The cylinders P and Q float on water. it is observed that P floats with 2/3rd of its volume immersed and Q floats with half of its volume immersed. The ratio of densities of P and Q is Show Answer

Q66) Assertion :
The machine parts are jammed in water.
Reason :
The viscosity of lubricant used in machine parts increases at low temperature. Show Answer

Q67) Assertion :
Steel is more elastic than rubber.
Reason :
Under a given deforming force, steel is deformed less than rubber Show Answer

Q68) Assertion :
The dimensions of surface energy are same as that of energy.
reason :
Surface energy = Energy / Area Show Answer

Q69) Assertion :
Hot soap solution is preferred for a washing dirty clothes.
Reason :
Surface tension of soap solution decreases on heating. Show Answer

Q70) Assertion :
Finer the capillary, greater is the height to which the liquid rises in the tube.
Reason :
This is an accordance with ascent formula. Show Answer

Q71) Assertion :
All the rain drops hit the surface of the earth with the same constant velocity.
Reason :
An object falling through a viscous medium eventually attain a terminal velocity. Show Answer

Q72) A vertical glass capillary tube, which is at both ends, contains some water. Which of the following shape will be attained by the water in the tube ? Show Answer

Q73) The vertical sections of a wing of a fan are shown in the figure below. The maximum upthrust is experienced in case of Show Answer

Q74) Which of the graphs in the figures below correctly represent the graphical variation between Stress (S) and Strain (E) for steel ? Show Answer

Q75) Which one of the graphs shown in these figures represents the velocity-time (V - t) graph of a small spherical body falling in a viscous fluid ? Show Answer

Q76) Droplets of a liquid are usually more spherical in shape than large drop of same liquid because the force of
Show Answer

Q77) A balloon made of rubber ad filled with air is floating in water in such a way that its top surface just coincides with the level of the water. If the balloon is gently pushed a short distance downwards in water and then released, it will
Show Answer

Q78) A block of wood floats in water with 4/3 part under water. If it floats in another liquid with 9/10 part under it, then the relative density of this liquid will be
Show Answer

Q79) When a load of 1.0 kg is suspended from 1.0 m long wire, its length increases by 1.0 mm. Its radius would change by
Show Answer

Q80) If atmospheric pressure p is measured at different heights H and plotted on a graph, the shape of the curve will be
Show Answer

Q81) Consider the following statements :
A body will float in a liquid when
(I) the density of the body is less than that of liquid.
(II) weight of displaced liquid is equal to the weight of the body.
(III) the volume of the displaced liquid is equal to volume of body. Show Answer

Q82) The spherical shape of a small drop of rain is due to
Show Answer

Q83) A body floats with one-third of its volume outside water and three-fourths of its volume outside in another liquid. The specific gravity of the liquid is
Show Answer

Q84) Mosquitoes can lay eggs on the surface of water. But when oil is sprinkled on the surface of water, mosquitoes cannot lay eggs because
Show Answer

Q85) A body loses 1/5 of its weight when fully immersed in water. What is the density of the body ?
Show Answer

Q86) Bernoulli's equation pertains to the
Show Answer

Q87) When the temperature of a liquid increases, the surface tension of the liquid
Show Answer

Q88) ASSERTION (A) : A hydrogen filled balloon stops rising after it has attained a certain height in the sky.
REASON (R) : The atmospheric pressure decreases with height and becomes zero when maximum height is attained.
Show Answer

Q89) Small drops of a liquid are spherical in shape because
Show Answer

Q90) The hydraulic brakes used in automobiles is directly based on application of
Show Answer

Q91) The vertical sections of a wing of a fan are shown. Maximum upthrust is in
Show Answer

Q92) The mean translational kinetic energy of a perfect gas molecules at temperature T is (k = Boltzmann's constant)
Show Answer

Q93) An ice cube containing a glass ball is floating on the surface of water contained in a trough. The whole of the ice melts; the level of water in the trough
Show Answer

Q94) 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 slightly pushed down. What will happen to the body ?
Show Answer

Q95) A sample of metal weighs 210 g in air, 180 g in water and 120 g in an unknown liquid. Then the density of metal is
Show Answer

Q96) Two soap bubbles have radii in the ratio of 2:1. What is the ratio of excess pressure inside them ?
Show Answer

Q97) A capillary tube of radius R is immersed in water and water rises in it to a height H. The mass of water in capillary tube is M. If the radius of the tube is double, then mass of water that will rise in capillary will be
Show Answer

Q98) The angle of contact for pure Hg and clean glass is
Show Answer

Q99) Gain in surface energy for an increase in liquid surface by A is
Show Answer

Q100) Many spherical drops of a liquid of radius r each. Coalesce to form a single drop of radius R and volume V. If T is surface tension, then the release of energy is
Show Answer

Q101) A water proofing agent changes the angle of contact from Show Answer

Q102) A U tube is partially filled with water, oil which does not mix with water, is next poured into one side until water rises by 25 cm. On the other side if the density of oil be 0.8, the oil level will stand higher than the water level by Show Answer

Q103) Kerosene oil rises up in a wick of lantern because of Show Answer

Q104) Due to capillary action, a liquid will rise in a tube of angle of contact is Show Answer

Q105) Two wires of the same radius and material have their lengths in the ratio 1:2. If these are stretched by the same force, the strain produced in the two wires will be in the ratio Show Answer

Q106) Consider a liquid contained in a vessel. The liquid-solid adhesive force is very weak as compared to the cohesive force in the liquid. The shape of the liquid surface near the solid will be Show Answer

Q107) Capillary is dipped vertically in a liquid. The level in the capillary will be same as outside the capillary if the angle of contact is Show Answer

Q108) The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ? Show Answer

Q109) A beam of metal supported at the two ends is loaded at the centre. The depression at the centre is proportional to Show Answer

Q110) The shape of the liquid meniscus in a capillary tube placed in water which wets the surface of the tube is Show Answer

Q111) A capillary tube is partially immersed in a wetting liquid. In this situation, the loss in the weight of the capillary tube will be Show Answer

Q112) It is easier to spray water to which soap is added, because Show Answer

Q113) End of the glass tube becomes round on heating due to Show Answer

Q114) The depression at the mid-point of a girder can be reduced by Show Answer

Q115) Surface tension mainly arises due to Show Answer

Q116) When there are no external forces, the shape of a small liquid drop is determined by Show Answer

Q117) A steel needle slowly placed on the surface of water floats on its because Show Answer

Q118) For a gas rms speed at 800 K is Show Answer

Q119) A steel ring of radius r and cross-sectional area A is shifted onto a wooden disc of radius R. If Young's modulus be E, then the force with which the steel ring is expanded, is Show Answer

Q120) The Young's modulus for a perfectly rigid body is Show Answer

Q121) If a gas is heated at constant pressure, its isothermal compressibility Show Answer

Q122) The viscous force on a small sphere of radius R moving in a fluid is directly proportional to Show Answer

Q123) Let W be the work done, when a bubble of volume V is formed from a given solution. How much work is required to be done to form a bubble of volume 2V ? Show Answer

Q124) Under a pressure head the rate of flow of volume of liquid through a capillary tube is Q. If the length of capillary tube is doubled and diameter of the bore is halved, the rate of flow would become Show Answer

Q125) An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will Show Answer

Q126) A long cylindrical glass vessel has a small hole of radius r at its bottom. The depth to which the vessel can be lowered vertically in a deep water bath without any water entering inside, is Show Answer

Q127) One thousand small water drops of equal size combine to form a big drop. The ratio of the final surface energy to the total initial surface energy is Show Answer

Q128) As we go up in the atmosphere, the heights of the various regions are in the order Show Answer

Q129) A body floats in a liquid if the buoyant force is Show Answer

Q130) The energy in stretched wire is Show Answer

Q131) Out of solid, liquid and gas which has maximum elasticity ? Show Answer

Q132) The substance which exhibits practically no elastic effect is Show Answer

Q133) A stone weighing 200 g weighs 150 when immersed in water and 175 g when immersed in oil. The density of the oil is Show Answer

Q134) A stone weighing 750 g appears to weighs only 500g when it is submerged in water density 1 g/cc. The volume of the stone is : Show Answer

Q135) Why doesn't Archimedes' principle hold for a vessel under a free fall ? Show Answer

Q136) The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity ? Show Answer

Q137) Each of the identical cylindrical vessel with their bases at the same level contains same liquid. The level of liquid in one vessel is twice that in the other. What happens to potential energy of the system if the vessels are interconnected by a pipe in order to equalise the levels ? Show Answer

Q138) A long wire can support a load w without braking. It is cut into four equal parts from its length. What is the maximum load that each part can support separately ? Show Answer

Q139) Why do two ice blocks join to form one block when pressed together ? Show Answer

Q140) Flow velocities in an incompressible fluid can be measured with which one of the following ? Show Answer

Q141) Which one among the following statement regarding the properties of mixture and compounds is not correct ? Show Answer

Q142) Suppose, we have an iron nail and an iron ball of same mass. When submerged in water, the iron ball may float, but the nail always sinks. This is because Show Answer

Q143) The breaking stress of a wire depends on Show Answer

Q144) Pressure of a gas increases due to increase of its temperature because at higher temperature Show Answer

Q145) When a solid object is immersed in water, there is a loss in its weight. This loss is Show Answer

Q146) For a steel boat floating on a lake, the weight of the water displaced by the boat is Show Answer

Q147) Lead ball falls through water more slowly than through air, because Show Answer

Q148) When a ship floats on water Show Answer

Q149) MFP of molecules of a gas depends on the pressure of the gas as Show Answer

Q150) Which one of the following elements exists in liquid state at room temperature ? Show Answer

Q151) Kinetic viscosity of a given liquid is the ratio of the Show Answer

Q152) When oil floats on water, the surface tension of water Show Answer

Q153) Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment Show Answer

Q154) Consider the following statements:
The fraction of a ball floating inside the liquid depends upon
(I) density of the liquid
(II) mass of the ball.
(III) density of the ball.
Which of the statements given above are correct ? Show Answer

Q155) Water flows out of the hole of a bucket and follows a parabolic path. If the bucket falls freely under gravity, the water flow (ignoring air resistance) Show Answer

Q156) The density of cast iron having specific gravity 7.20 is Show Answer

Q157) There are two strings of equal length and diameter but the densities are in the ratio 1:2, they are stretched by a tension T. The ratio of frequencies will be Show Answer