NEET UG 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 NEET UG Mechanical Properties of Fluids in the app →A passenger standing in a bus is thrown backward when the bus suddenly starts moving forward. This is best expOne newton is defined as the force that gives a mass of 1 kg an acceleration of:The linear momentum of a body is defined as the product of its:The impulse of a force has the same dimensions as:The action and reaction forces of Newton's third law:For a given pair of surfaces, the coefficient of kinetic friction is usually:A constant force of 20 N acts on a 5 kg body initially at rest. Its speed after 3 s is:A 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed. The magnitude of thA 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The average resistive forA box rests on the floor of a truck with coefficient of static friction 0.15. The maximum acceleration of the A block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static fA 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of the gun is:A 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g = 10 m s⁻²). The scaA 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tenThe maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs =A 3 kg block hangs from a light string passing over a frictionless pulley and pulls a 20 kg trolley along a hoFor a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tensioA 6 kg mass hangs from a light rope. A horizontal force of 50 N is applied at the rope's midpoint (g = 10 m s⁻One ball strikes a wall normally and rebounds with unchanged speed; an identical ball strikes at 30° to the noA net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4A block slides down a rough incline of 30° with coefficient of kinetic friction 0.2 (g = 10 m s⁻²). Its acceleA lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside isA 10 N horizontal force is applied to a 2 kg block that pushes a 3 kg block in contact with it on a frictionleA 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse iThe optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g Per NCERT §5.1.2, an OPEN system exchanges what with its surroundings, in contrast to a closed or isolated onePer NCERT §5.1.2, an ISOLATED system is exemplified by which container?Per NCERT §5.1.4, the INTERNAL ENERGY U of a system is classified as which kind of property?Per NCERT eqn 5.1, the FIRST LAW of thermodynamics is expressed as which equation, with sign conventions?Per NCERT eqn 5.2, the pressure-volume WORK done on a gas at constant external pressure p_ex is given by whichPer NCERT §5.2.1 + eqn 5.5, for an isothermal REVERSIBLE expansion of n mol of an ideal gas from V_i to V_f, wPer NCERT §5.2.1 (free expansion), what is the work done in FREE EXPANSION of an ideal gas into vacuum (p_ex =Per NCERT §5.2.1, a process is called REVERSIBLE if it satisfies which condition?Per NCERT §5.2.1, for an ADIABATIC process (no heat exchange, q = 0), the first law reduces to which form?Per NCERT §5.2.1, for an ISOTHERMAL IRREVERSIBLE expansion of an ideal gas at constant external pressure p_ex,Per NCERT §5.2.1, at CONSTANT VOLUME (ΔV = 0), the first law simplifies to which?Per NCERT Problem 5.2, when 2 L of an ideal gas at 10 atm expands isothermally into VACUUM to total volume 10 Per NCERT §5.2.2 + eqn 5.7, the ENTHALPY H is defined as which quantity?Per NCERT eqn 5.10, the relationship between ΔH and ΔU for a gaseous reaction is which?Per NCERT Problem 5.5, for vaporisation of 1 mol of water at 100 °C and 1 bar, given ΔH = 41 kJ/mol, what is ΔPer NCERT eqn 5.13, the relationship between C_p and C_v for an ideal gas is which?Per NCERT §5.4(a), the STANDARD STATE of a substance at a specified temperature is which?Per NCERT Table 5.1, the standard enthalpies of fusion and vaporisation of WATER are which?Per NCERT §5.4(c), what is the CONVENTION for the standard enthalpy of formation Δ_f H° of an ELEMENT in its rPer NCERT Table 5.2, Δ_f H° of methane CH₄(g) is which value?Per NCERT eqn 5.15, the standard enthalpy of REACTION from formation enthalpies is computed as which?Per NCERT §5.4(e), HESS'S LAW of constant heat summation states which?Per NCERT §5.4(e) (worked example), given C+O₂→CO₂ ΔH = −393.5 and CO+½O₂→CO₂ ΔH = −283.0 kJ/mol, what is Δ_f Per NCERT §5.4(d) (thermochemical equations), if a chemical equation is REVERSED, what happens to Δ_r H°?Per NCERT §5.5(a), the STANDARD ENTHALPY OF COMBUSTION Δ_c H° of butane (cooking gas) is which?Per NCERT §5.5(a), the standard enthalpy of combustion of GLUCOSE (C₆H₁₂O₆) is which?Per NCERT §5.5(b), the ENTHALPY OF ATOMIZATION Δ_a H° of dihydrogen is which value, and how does it relate to Per NCERT §5.5(c), in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?Per NCERT eqn 5.17, the standard enthalpy of a GAS-phase reaction from bond enthalpies is approximated as whicPer NCERT Table 5.3(b), the bond enthalpy of N≡N triple bond is which value — among the highest known for diatPer NCERT §5.5(d), the LATTICE ENTHALPY of an ionic compound is defined as the enthalpy change for which procePer NCERT §5.5(d), the BORN-HABER cycle for NaCl uses Hess's law and includes which steps?Per NCERT §5.5(e), the enthalpy of SOLUTION Δ_sol H° of an ionic compound in water is decomposed as which sum?Per NCERT §5.3, a BOMB CALORIMETER measures which thermodynamic quantity?Per NCERT Problem 5.6, 1 g graphite burnt in a bomb calorimeter (heat capacity 20.7 kJ/K) raises temperature bPer NCERT Table 5.2, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond —Per NCERT §5.6, a SPONTANEOUS process is best defined as which of the following?Per NCERT §5.6(b), ENTROPY S is best described as which?Per NCERT eqn 5.18, the entropy change for a REVERSIBLE process is given by which expression?Per NCERT eqn 5.19, for a SPONTANEOUS process the TOTAL entropy change (system + surroundings) obeys which inePer NCERT Problem 5.10, in which of the following processes does entropy DECREASE?Per NCERT §5.6(e), the THIRD LAW of thermodynamics states which?Per NCERT §5.6(d), the SECOND LAW of thermodynamics, in entropy form, states which?Per NCERT eqn 5.20-21, GIBBS energy G and its change ΔG at constant T are given by which expressions?Per NCERT §5.6(c) (criteria), the sign of ΔG for a SPONTANEOUS process at constant T and p is which?Per NCERT Table 5.4, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?Per NCERT Table 5.4, a reaction with ΔH > 0 AND ΔS > 0 is spontaneous under which condition?Per NCERT §5.7 eqn 5.23, the relation between ΔG° and equilibrium constant K is which?Per NCERT §4.5, the dimensions of FORCE are which set?Per NCERT Example 4.7, the MAXIMUM acceleration of a train such that a box on its floor (μ_s = 0.15) remains sPer NCERT Example 4.10, a cyclist taking a R=3 m turn at 18 km/h (μ_s = 0.1) is in which condition?A gas absorbs $200$ J of heat and does $80$ J of work on its surroundings. The change in internal energy is:A pump compresses gas very fast, so no heat escapes. The process is:A Carnot engine works between $T_h = 400$ K and $T_c = 300$ K. Its efficiency is:A glass of cold lassi placed on a kitchen counter eventually warms to room temperature. The second law of therFor a reaction occurring at constant pressure in an open beaker, the heat absorbed equals:Hess's law states that the standard enthalpy change for a reaction:Among solid ice, liquid water, and water vapour at the same temperature, entropy is:A reaction has $\Delta H = -100$ kJ and $\Delta S = +200$ J/K. At $T = 298$ K, $\Delta G$ is:Pressure at depth h below the free surface of a liquid of density ρ (with atmospheric pressure P₀ above) is:Pascal's law states that pressure applied at any point of an enclosed incompressible fluid is:A body immersed in a fluid experiences an upward buoyant force equal to the weight of fluid displaced. This isFor a steadily flowing incompressible fluid, the continuity equation A·v = constant means:Bernoulli's equation for steady, non-viscous, incompressible flow along a streamline reads:A horizontal pipe narrows from A₁ to A₂ < A₁. Compared to the wider section, in the narrower section the fluidThe terminal velocity v_t of a small sphere of radius r falling in a fluid of viscosity η is given by Stokes' Reynolds number Re is dimensionless and given by Re = ρ v d / η, where d is a characteristic length. For Re ≪ Surface tension T of a liquid is best defined as:The excess pressure inside a spherical liquid drop of radius R and surface tension T is:The height to which a liquid rises in a capillary tube of radius r is (with surface tension T, contact angle θA liquid emerges from a hole at depth h below the free surface of a large open tank. The exit speed (TorricellTwo soap bubbles of radii R₁ < R₂ are connected by a tube. Air flows:A solid object floats with 80 % of its volume submerged in water (ρ_water = 1000 kg m⁻³). The density of the oPoiseuille's law gives the volume flow rate Q of a viscous fluid through a horizontal pipe of length L and radThe 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: