CBSE Class 11 (Science) Thermodynamics — 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) Thermodynamics in the app →As 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?Two systems each in thermal equilibrium with a third are in equilibrium:The law about equilibrium with a third system is the:The zeroth law was formulated by:The zeroth law was formulated in the year:The quantity equal for two systems in thermal equilibrium is:A wall that does not let heat pass is called:Which of these is a thermodynamic variable?In an isothermal process the quantity held fixed is the:For an ideal gas in an isothermal process, PV stays:Gas expanding in a cylinder inside a large fixed temperature reservoir is:In an isothermal expansion, the heat supplied equals the:A device converting heat to work through a cyclic process is a:The Kelvin-Planck statement rules out converting heat completely into:The Clausius statement forbids heat flowing on its own from a body:The Kelvin-Planck and Clausius statements are:Rudolf Clausius is regarded as the discoverer of which law?Rudolf Clausius was born in:The entropy of an isolated system can never:Besides thermodynamics, Clausius worked on the kinetic theory of:A heat engine takes its working substance around a process that is:A perfect refrigerator is denied by the statement due to:Clausius arrived at the second law building on the work of Carnot and:Which law of thermodynamics leads to the concept of temperature?In which year was the zeroth law of thermodynamics formulated?Bodies A and B are each in thermal equilibrium with C. What follows for A and B?Two systems in thermal equilibrium must have equal values of which quantity?Before heat was understood as energy, it was pictured as an invisible fluid calledCount Rumford's 1798 cannon-boring observation supported which idea?Thermodynamics is best described as which kind of science?A bullet pierces a wooden block and stops. Its kinetic energy mainly becomesWhy is internal energy called a state variable?Which pair are NOT thermodynamic state variables?Heat flows on its own between two bodies in contact fromBetween two given states, which quantity is independent of the path taken?A gas expands by 2 x 10^-3 m^3 against a steady pressure of 10^5 Pa. Work done by the gas isWhat is the SI unit of specific heat capacity?Heat capacity per mole of a substance per kelvin is called itsBy equipartition of energy, the molar specific heat of a solid is aboutWhich solid is an exception to the 3R rule for molar heat at room temperature?The prediction C = 3R for solids fails mainly atOne calorie is the heat needed to warm 1 g of water fromAbout how much heat raises 100 g of water from 20 °C to 30 °C?For an ideal gas, Cp - Cv equalsAn ideal gas has Cv = 20.8 J mol^-1 K^-1. Taking R = 8.31 J mol^-1 K^-1, Cp is aboutFor an ideal gas, Cv equals change in internal energy per kelvin per mole because U depends only onA relation connecting state variables such as PV = µRT is calledHow many independent state variables does a fixed amount of ideal gas have?A pressure-volume curve drawn at fixed temperature is calledA gas in equilibrium is split into two equal halves. Which quantity is halved in each part?Why can a gas during sudden free expansion into vacuum not be described by state variables?A quasi-static process is one that isIn a quasi-static process, the system and surroundings differ in pressure byA process in which the volume is kept constant is calledAn ideal gas expands isothermally and absorbs 600 J of heat. The work done by the gas isDuring isothermal compression of an ideal gas, the gasFor an adiabatic change of an ideal gas, which quantity stays constant?In the adiabatic relation PV^γ = constant, γ stands forAn insulated gas does 150 J of work on a piston. The change in its internal energy isOne mole of ideal gas with γ = 1.4 cools by 20 K in adiabatic expansion. With R = 8.3 J mol^-1 K^-1, the work A gas in a rigid sealed tank absorbs 250 J of heat. The work done by the gas isIn an isobaric process of an ideal gas, the heat absorbed goes intoA gas completes a cycle and absorbs a net 80 J of heat. The net work done by it is'No process can have the sole result of turning heat from a reservoir fully into work' is theThe Clausius statement rules out a process whose only result isBy the second law, the coefficient of performance of a refrigerator can never beThe second law of thermodynamics says the efficiency of a heat engine can never beMost spontaneous processes in nature areWhich is a main cause of irreversibility in real processes?Which of these processes is reversible?The French engineer who first studied the maximum efficiency of a heat engine in 1824 wasThe Carnot cycle consists ofA Carnot engine has its source at 127 °C and sink at 27 °C. Its efficiency isA Carnot engine with sink at 300 K has 50% efficiency. Its source temperature isThe efficiency of a Carnot engine depends on theWhen every step of a Carnot cycle is run backwards, the device acts as aCarnot's theorem states that between two given temperatures no engine is more efficient thanAs temperature approaches absolute zero, the entropy of a system approachesThe constant entropy a system keeps at absolute zero is called itsWhich kind of solid can keep a residual entropy well above zero at absolute zero?A machine claimed to produce work with no energy input violates theIn a natural process, the total entropy of the interacting systemsIn a reversible heat transfer, the heat element δQ equalsAt absolute zero, a system is in the state of minimum thermal energy known as itsFor an isolated system, the first law implies that its total energyNatural processes tend toward spatial uniformity of temperature. Which law describes this?The zeroth law makes thermal equilibrium a relation of which type?In thermodynamics, which term names the part of the universe being observed?The universe in thermodynamics is the sum of which two parts?Reactants kept in an open beaker form which kind of system?Which exchange is possible in a closed system?Reactants sealed inside a thermos flask form which system?What is exchanged between an isolated system and its surroundings?A sealed copper vessel containing reactants is an example of what?What is the wall that separates a system from its surroundings called?Why are p, V and T called state functions?Which of these is an extensive property?A gas container is split into two equal halves by a partition. Which property is unchanged in each half?What is an adiabatic process?Under the IUPAC convention, when is the work w positive?Under the IUPAC convention, q is positive when what happens?Which equation is the mathematical statement of the first law?What is ΔU for an isolated system where w = 0 and q = 0?Which quantity can thermodynamics measure only as a change, never as an absolute value?A system takes in 500 J of heat and does 200 J of work. What is ΔU?A system gives out 150 J as heat while 400 J of work is done on it. What is ΔU?A system gets work but no heat, so its wall is of which type?What is the sign of w when a gas is compressed?