[{"id":211312,"question":"Mean free path of gas molecules in inversely proportional to its.","choices":[{"text":"Weight","value":"A"},{"text":"Temperature","value":"B"},{"text":"Pressure","value":"C"},{"text":"Volume","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211311,"question":"Gas exert pressure on walls of the visual because gas molecules.","choices":[{"text":"Posses momentum","value":"A"},{"text":"Have finite volume","value":"B"},{"text":"Collide with each other","value":"C"},{"text":"Obey gas laws","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211310,"question":"The pressure of a gas is directly proportions to","choices":[{"text":"Mean velocity of the molecules","value":"A"},{"text":"Mean square velocity of the molecules","value":"B"},{"text":"Root mean square velocity of the molecules","value":"C"},{"text":"Instantaneous velocity of the molecules","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211309,"question":"According to kinetic theory of gases one assumes that the collisions between molecules are.","choices":[{"text":"Perfectly elastic","value":"A"},{"text":"Perfectly inelastic","value":"B"},{"text":"Partly elastic","value":"C"},{"text":"Partly inelastic","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211308,"question":"At absolute zero of temperature.","choices":[{"text":"The molecular energy is zero","value":"A"},{"text":"Molecules have translational K.E","value":"B"},{"text":"Molecules have rotational K.E.","value":"C"},{"text":"Molecules have maximum energy","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211307,"question":"Pressure of a gas depends upon","choices":[{"text":"Only on the molecular speed","value":"A"},{"text":"Only on the speed of molecules on a unit volume","value":"B"},{"text":"Only on the mass of molecules","value":"C"},{"text":"Number of molecules mass and speed in a unit volume","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211306,"question":"Specific heat a different substances varies becouse of","choices":[{"text":"Same number of molecules in unit mass","value":"A"},{"text":"Different number of molecules in unit mass","value":"B"},{"text":"Different K.E. of molecules in unit mass","value":"C"},{"text":"Same K.E. of molecules in unit mass","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211305,"question":"Under an isothermal process internal energy of the system.","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"Remain constant","value":"C"},{"text":"is Zero","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211304,"question":"The process in which a system undergoes a change of state at constant volume.","choices":[{"text":"Isobaric process","value":"A"},{"text":"Isochoric process","value":"B"},{"text":"Isothermal process","value":"C"},{"text":"Adiabatic process","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211303,"question":"In an isochoric process.","choices":[{"text":"Volume changes","value":"A"},{"text":"Pressure changes","value":"B"},{"text":"Temperature changes","value":"C"},{"text":"Volume remains constant","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211302,"question":"If T1 and T2 are source and sink temperature respectively Carnot efficiency is.","choices":[{"text":"T1+T2/T1","value":"A"},{"text":"T1-T2/T1","value":"B"},{"text":"T1+T2/T2","value":"C"},{"text":"T1-T2/T2","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211301,"question":"Which quantity must be the same for two bodies if they are to be in thermal equilibrium.","choices":[{"text":"Internal energy","value":"A"},{"text":"P.E","value":"B"},{"text":"Temperature","value":"C"},{"text":"Mass","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211300,"question":"Thermal conduction in metals differs from thermal conduction in insulators,. The reasons for this is that , in metals heat can be transported by.","choices":[{"text":"Electrons","value":"A"},{"text":"Lattice vibrations","value":"B"},{"text":"Photons","value":"C"},{"text":"Positive ions","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211299,"question":"Which statement about convection is correct.","choices":[{"text":"Brownian motion is a form of convection","value":"A"},{"text":"Convection occurs only in gas","value":"B"},{"text":"Convection results from a density change","value":"C"},{"text":"Evaporation is a form of convection","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211298,"question":"An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.","choices":[{"text":"120 s","value":"A"},{"text":"150 s","value":"B"},{"text":"1200 s","value":"C"},{"text":"1500 s","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211297,"question":"What happens to Carnot efficiency if the source temperature increases.","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remain the same","value":"C"},{"text":"Becomes zero","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211296,"question":"What happen to entropy in an irreversible cycle.","choices":[{"text":"No gain in entropy","value":"A"},{"text":"No change in entropy","value":"B"},{"text":"Loss of entropy","value":"C"},{"text":"A net gain of entropy","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211295,"question":"What is the represented by the area inside the Carnot cycle.","choices":[{"text":"Heat taken to increase the body temperature.","value":"A"},{"text":"Energy loss due to leakage","value":"B"},{"text":"Useful work done","value":"C"},{"text":"Heat rejected by the system","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211294,"question":"The practical efficiency of a heat engine is","choices":[{"text":"25% to 30.5 %","value":"A"},{"text":"35% to 45%","value":"B"},{"text":"30% to 45%","value":"C"},{"text":"15% to 25%","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211293,"question":"Contrivances for converting heat into work are called.","choices":[{"text":"Heat pumps","value":"A"},{"text":"Heat engines","value":"B"},{"text":"IC engines","value":"C"},{"text":"Jet engine","value":"D"},{"value":"E"}],"correctAnswer":2}]