Physics-
General
Easy
Question
A particle is projected from a point 
with velocity 
at an angle of 
with horizontal as shown in figure. It strikes the plane 
at right angles. The velocity of the particle at the time of collision is
The correct answer is:
Let 
be the velocity at the time of collision
Then, 
Related Questions to study
chemistry-
Assertion: At constant pressure for the change H2O(s)→H2O(g) work done is negative.
Reason: During phase transition work done is always negative.
Assertion: At constant pressure for the change H2O(s)→H2O(g) work done is negative.
Reason: During phase transition work done is always negative.
chemistry-General
chemistry-
In view of the signs of DG° or the following reactions:
PbO2 +Pb→2PbO,DrG°<0
SnO2 +Sn→2SnO,DrG°>0, which oxidation states are more characteristic for lead and tin?
In view of the signs of DG° or the following reactions:
PbO2 +Pb→2PbO,DrG°<0
SnO2 +Sn→2SnO,DrG°>0, which oxidation states are more characteristic for lead and tin?
chemistry-General
chemistry-
Considerthereaction:4NO2(g) O2(g) →2N2O5(g) ,DH=–111kJ IfN2O5(s)isformedinsteadofN2O5(g)intheabove reaction,theDHvaluewillbe:(given,DHofsublimationfor N2O5is54kJmol )</span
Considerthereaction:4NO2(g) O2(g) →2N2O5(g) ,DH=–111kJ IfN2O5(s)isformedinsteadofN2O5(g)intheabove reaction,theDHvaluewillbe:(given,DHofsublimationfor N2O5is54kJmol )</span
chemistry-General
chemistry-
Thevalueofenthalpychange(DH)forthe reactionC2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) at 27°Cis–1366.5kJmol–1.The valueofinter- nalenergychangefortheabovereactionat this temperaturewillbe-
Thevalueofenthalpychange(DH)forthe reactionC2H5OH(l)+3O2(g)→2CO2(g)+3H2O(l) at 27°Cis–1366.5kJmol–1.The valueofinter- nalenergychangefortheabovereactionat this temperaturewillbe-
chemistry-General
chemistry-
Fromthethermochemicalreactions,C(graphite)+½O2 →CO;DH=–110.5KJ CO+1/2O2 →CO2;DH=–83.2KJ Theheatofreactionof C(graphite)+O2 →CO2is-
Fromthethermochemicalreactions,C(graphite)+½O2 →CO;DH=–110.5KJ CO+1/2O2 →CO2;DH=–83.2KJ Theheatofreactionof C(graphite)+O2 →CO2is-
chemistry-General
chemistry-
TheDH° for CO2(g) ,CO(g) and H2O(g) are –393.5,–110.5and–241.8Kjmol–1respectively the standard enthalpychange (in KJ) for the reactionCO2(g)+H2(g)→CO(g)+H2O(g)is-
TheDH° for CO2(g) ,CO(g) and H2O(g) are –393.5,–110.5and–241.8Kjmol–1respectively the standard enthalpychange (in KJ) for the reactionCO2(g)+H2(g)→CO(g)+H2O(g)is-
chemistry-General
chemistry-
Which of the followingequationsrespresents standardheatofformationofCH4 ?
Which of the followingequationsrespresents standardheatofformationofCH4 ?
chemistry-General
chemistry-
2molesof COaremixedwith 1moleofO2ina containerof1l.Theycompletelytoform2moles ofCO2.Ifthe pressurein the vesselchanges from70atmto40atm,whatwill bethevalue of DU in kJat500K(The gasesdeviateappreciably from idealbehaviour.) 2CO+O2→2CO2;DH=-560kJ/mol, 1Latm=0.1kJ For theprocessH2O(l)(1 bar,373K)→H2O(g) (1bar,373K),thecorrect setofthermodynamic parametersis-
2molesof COaremixedwith 1moleofO2ina containerof1l.Theycompletelytoform2moles ofCO2.Ifthe pressurein the vesselchanges from70atmto40atm,whatwill bethevalue of DU in kJat500K(The gasesdeviateappreciably from idealbehaviour.) 2CO+O2→2CO2;DH=-560kJ/mol, 1Latm=0.1kJ For theprocessH2O(l)(1 bar,373K)→H2O(g) (1bar,373K),thecorrect setofthermodynamic parametersis-
chemistry-General
chemistry-
The conversion A to B is carried out by the following path:
Given: DS(A→C) =50e.u.,DS(C→D) =30 e.u., DS(B→D) =20e.u. Where e.u.is entropy unit then DS(A→B) is
The conversion A to B is carried out by the following path:
Given: DS(A→C) =50e.u.,DS(C→D) =30 e.u., DS(B→D) =20e.u. Where e.u.is entropy unit then DS(A→B) is
chemistry-General
physics-
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are 
and 
respectively, then
Three balls are dropped from the top of a building with equal speed at different angles. When the balls strike ground their velocities are and respectively, then
physics-General
Maths-
When does the current flow through the following circuit ?
When does the current flow through the following circuit ?
Maths-General
Maths-
The following circuit when expressed in symbolic form of logic is :
The following circuit when expressed in symbolic form of logic is :
Maths-General
chemistry-
Onemoleofanon-idealgasundergoesachange ofstate(2.0atm,3.0L,95K)→(4.0atm,5.0L,245 K)with achangein internalenergy,DU=30.0L atm.Thechangeinenthalpy(DH)oftheprocessinLatmis-
Onemoleofanon-idealgasundergoesachange ofstate(2.0atm,3.0L,95K)→(4.0atm,5.0L,245 K)with achangein internalenergy,DU=30.0L atm.Thechangeinenthalpy(DH)oftheprocessinLatmis-
chemistry-General
chemistry-
Inconversion oflime-stonetolime,CaCO3(s)→CaO(s)+CO2(g)thevalues ofDHºandDSºare+179.1kJmol–1and160.2J/Krespectivelyat298Kand1bar.AssumingthatDHºandDSºdonotchange withtemperature,temperatureabovewhich conversionoflimestonetolimewillbespontaneous is-
Inconversion oflime-stonetolime,CaCO3(s)→CaO(s)+CO2(g)thevalues ofDHºandDSºare+179.1kJmol–1and160.2J/Krespectivelyat298Kand1bar.AssumingthatDHºandDSºdonotchange withtemperature,temperatureabovewhich conversionoflimestonetolimewillbespontaneous is-
chemistry-General
chemistry-
Consider the reaction:N2+ 3H2→2NH3carried out at constant temperature and pressure. If DH and DU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?
Consider the reaction:N2+ 3H2→2NH3carried out at constant temperature and pressure. If DH and DU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?
chemistry-General
