CBSE Class 11 (Science) Mechanical Properties of Fluids — practice questions
120 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Mechanical Properties of Fluids in the app →Newton's first law of motion is also known as the law ofA cricket ball of mass 150 g moving at (3i+4j) m/s is hit to -(3i+4j) m/s. The magnitude of momentum change isConservation of linear momentum in a collision follows directly fromA force F acts on a 2 kg body for 3 s, changing its speed from 2 m/s to 8 m/s along the line of F. The magnituThe maximum static friction force on a body is f = μN. Static friction is best described asA 10 kg block on a frictionless surface is pulled by 20 N horizontally and 20 N at 60° above horizontal. The hImpulse equalsA body in equilibrium under several forces hasA 0.5 kg ball hits a wall at 10 m/s and rebounds at 10 m/s. The impulse on the ball isNewton's second law in vector form isA lift accelerates upward at 2 m/s². The apparent weight of a 50 kg person (g=10) isTwo blocks of 2 kg and 3 kg connected by a string are pulled by 10 N on the 3 kg block (frictionless). The accThe SI unit of force, the newton, equalsAs per your syllabus, an ISOLATED system is exemplified by which container?As per your syllabus, for an ADIABATIC process (no heat exchange, q = 0), the first law reduces to which form?As per your syllabus, + eqn 5.7, the ENTHALPY H is defined as which quantity?As per your syllabus, for vaporisation of 1 mol of water at 100 °C and 1 bar, given ΔH = 41 kJ/mol, what is ΔUAs per your syllabus, Δ_f H° of methane CH₄(g) is which value?As per your syllabus, the standard enthalpy of combustion of GLUCOSE (C₆H₁₂O₆) is which?As per your syllabus, in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?As per your syllabus, the bond enthalpy of N≡N triple bond is which value — among the highest known for diatomAs per your syllabus, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond As per your syllabus, eqn 5.18, the entropy change for a REVERSIBLE process is given by which expression?As per your syllabus, eqn 5.20-21, GIBBS energy G and its change ΔG at constant T are given by which expressioAs per your syllabus, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?As per your syllabus, eqn 5.23, the relation between ΔG° and equilibrium constant K is which?As per your syllabus, the dimensions of FORCE are which set?As per your syllabus, the MAXIMUM acceleration of a train such that a box on its floor (μ_s = 0.15) remains stAs per your syllabus, a cyclist taking a R=3 m turn at 18 km/h (μ_s = 0.1) is in which condition?The force a liquid exerts on a submerged surface is always:Pressure is defined as the normal force acting per unit:Pressure is which kind of physical quantity?The SI unit of pressure is named after the scientist:Blaise Pascal was a scientist from:The first method of measuring atmospheric pressure came from:Torricelli's pressure measuring device is known as the mercury:In the barometer, the tube of mercury is set up:At sea level the barometric mercury column stands at about:A pressure equal to one millimetre of mercury is called a:Pressure applied to an enclosed fluid is transmitted:Pascal's law says the transmitted pressure acts in directions that are:Which device is based on Pascal's law?Brakes in automobiles that work on Pascal's law are called:The rule about the upthrust on an immersed body is credited to:Archimedes was a philosopher and engineer from:Pressure above atmospheric at a given depth is called:The path taken by a fluid particle in steady flow is a:Steady flow is achieved when the flow speed is:Bernoulli's principle is derived using the conservation of:Daniel Bernoulli was a physicist from:The word efflux, as used for fluids, means:A needle pierces skin but a spoon's back pressed with the same force does not. The needle wins because of its:A fluid at rest pushes on a submerged object. The force is always:The SI unit of pressure honours the French scientist:The excess pressure at a depth over atmospheric pressure is called:Three differently shaped vessels joined at the bottom fill to the same level. This shows that pressure dependsAt 1 km below the sea the pressure rises by about:Torricelli's barometer uses a tube of mercury inverted into a trough. At sea level the column stands about:A pressure of 1 mm of mercury is called a:Pressure applied to an enclosed fluid is transmitted undiminished in all directions. This is used in:In a hydraulic lift a small force on a small piston lifts a car on a large piston. The force gain is the:The upward force a fluid exerts on a submerged body is the:Archimedes' principle says the upward force equals the weight of the:A stone is denser than water, so in water it:The path of a fluid particle in steady flow is a:The equation of continuity, Av = constant, expresses conservation of:Where a pipe narrows and streamlines crowd together, the fluid speed:Above a limiting speed called the critical speed, flow becomes:Water leaves a hole in an open tank at the speed of a freely falling body. This is:Plaque narrows an artery, blood speeds up there and pressure drops. The artery may:Honey needs a bigger force than oil to slide a plate at the same speed. Honey is more:Surface tension is a property of:A wet paint brush forms a fine tip when lifted from water. This is due to:What is the SI unit of pressure?One bar of pressure is equal to how many pascals?One torr, the same as 1 mm of mercury, equals about how many pascals?Standard atmospheric pressure at sea level is close to which value?Pressure in a fluid is best described as which kind of quantity?Take g = 10 m/s^2 and water density 1000 kg/m^3. What is the gauge pressure at 10 m depth in a lake?What does gauge pressure measure?A tyre pressure gauge reads which kind of pressure?In a mercury barometer, the column stands at about what height at sea level?What fills the space above the mercury column in a barometer tube?A hydraulic lift piston has 50 times the area of the small one. What force does 100 N give?Hydraulic brakes in cars depend on which principle?Water flows at 2 m/s in a pipe of area 4 cm^2 into a section of area 1 cm^2. What is the speed there?Bernoulli's equation is essentially which law applied to fluid motion?Bernoulli's equation fails for which type of flow?Why can two streamlines in steady flow never cross?Above the critical speed, streamline flow of a fluid becomes what?In laminar flow, the velocities at different points have which feature?What does the word efflux mean in Torricelli's law?A tank has a small hole 5 m below the water surface. Take g = 10 m/s^2. What is the efflux speed?A spinning cricket ball swerves from its parabolic path because of what?Dynamic lift acts on a body by virtue of its what?What are the dimensions of the coefficient of viscosity?Which liquid is more viscous than water?When the temperature of a liquid rises, its viscosity does what?When a gas is heated, its coefficient of viscosity does what?For fluid flowing in a pipe, where is the layer speed zero?Viscous drag on a small sphere of radius a at speed v in a fluid of viscosity eta is given by which expressionA falling raindrop reaches terminal velocity when what happens?If a falling sphere's radius doubles in the same fluid, its terminal velocity becomes how many times?Surface tension arises because surface molecules have what?Surface energy exists at an interface where at least one substance must be what?Compared with the outside, the pressure inside a spherical liquid drop is what?A soap bubble of radius 1 cm and surface tension 0.03 N/m has what excess pressure?Why does a soap bubble have a larger excess pressure than a drop of equal size?The angle of contact is measured between which two lines?What is the angle of contact of mercury with glass like?When the angle of contact is acute, the liquid does what to the solid?Detergents added to water have what effect on the angle of contact?The word capilla, from which capillary comes, means what in Latin?A water column of 0.07 N/m, zero contact angle, in a 0.5 mm radius tube rises how high? Take g = 10 m/s^2.If a capillary tube's radius is halved, the water rise becomes how many times?Why is blood pressure greater at the feet than at the brain?At about 6 km height, atmospheric pressure drops to nearly what fraction of sea level value?The relation P = Pa + rho g h is exact for which kind of fluid?In a steady flow, which quantity stays constant along a streamline, per Bernoulli?Layers of a viscous liquid sliding over one another resemble what?