JEE Main Surface Tension — practice questions
120 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice JEE Main Surface Tension in the app →A $5$ kg block rests on a frictionless horizontal surface. A constant horizontal force of $20$ N is applied toA person of mass $60$ kg stands on a weighing scale in a lift. The lift accelerates upward at $2$ m/s². What iA block of mass $10$ kg slides down an inclined plane that makes an angle of $37°$ with the horizontal. The coTwo blocks of masses $3$ kg and $5$ kg are connected by a light inextensible string passing over a smooth pullA $2$ kg block is pressed against a vertical wall by a horizontal force $F$. The coefficient of static frictioA monkey of mass $30$ kg climbs a vertical rope hanging from the ceiling with an upward acceleration of $2$ m/Newton's FIRST law is also called the law of:Newton's SECOND law states:The SI unit of force is the:Frictional force between surfaces ALWAYS acts:Static friction f_s satisfies:Kinetic friction f_k is given by:For a body on a horizontal surface, the NORMAL FORCE N equals:In circular motion at radius r and speed v, the centripetal acceleration is:The ANGLE OF REPOSE φ is related to coefficient of friction by:A 5 kg object experiences a net force of 20 N. Find its acceleration:A 10 kg block on rough horizontal surface with μ_s = 0.3 just starts moving. Force applied:A block of mass 2 kg on a smooth incline at 30°. Acceleration down the incline (g = 10):A 1500 kg car accelerates from 0 to 30 m/s in 10 s. Average force on car:In a tug-of-war, team A pulls with 200 N, team B pulls oppositely with 250 N. The rope (light) experiences netNewton's THIRD law pair: when you push a wall, the wall pushes you. These forces:A block of mass 5 kg on a rough incline at 37° with μ_k = 0.4. Acceleration down (g = 10, sin 37° = 0.6, cos 3For a body on a 60° incline with μ = 0.5, the body:Two blocks: 3 kg ON TOP of 5 kg, μ between them = 0.5. The 5 kg block on smooth floor. Horizontal force F = 20An object's WEIGHT on Earth (g = 10) is 50 N. Its MASS is:A 5 kg block is pushed with 30 N along a frictionless surface. Acceleration:A massless pulley system has two blocks: m₁ = 6 kg and m₂ = 4 kg hanging on either side. Find acceleration of The angle of repose between a block and an incline is 30°. The coefficient of static friction is:A 100 g object is moving in a vertical circle. At the TOP of the loop, for minimum speed (string just slack), Limiting (max static) friction is INDEPENDENT of:A 2 kg block on rough incline at 45° with μ = 0.3. Determine if it stays at rest (g = 10, sin 45° = cos 45° = A 4 kg mass hangs from a spring scale in an elevator. Spring reads 32 N. The elevator is:A 3 kg block is pulled with F = 20 N at 30° above horizontal on rough surface (μ_k = 0.4). Find acceleration (In a uniform circular motion, the SPEED is constant but velocity changes direction. The acceleration:A car turns a corner of radius 50 m at 20 m/s. Minimum coefficient of friction needed (g = 10):A 50 kg person stands on a scale in an elevator accelerating UP at 2 m/s². Scale reading:Two equal masses (3 kg each) connected by a light string over a frictionless pulley. One on smooth horizontal A pendulum of mass m swings to amplitude angle θ. At the lowest point of swing, the TENSION in the string equaA car of mass 1000 kg moving at 36 km/h is stopped by brakes in 5 seconds. Average force exerted by brakes: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, equalsPer 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:A liquid poured into a container acquires a:The free surface of a liquid possesses some additional:Surface tension concerns only liquids because gases have no:Surface tension is defined as a force per unit:Surface tension also equals the surface energy per unit:The surface energy of an interface depends on:Compared with molecules inside, those at the interface have energy:The angle between the tangent to a liquid and the solid is the:Whether a liquid spreads or forms droplets is decided by the: