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Recent questions tagged physics
Questions
In the following diagram , the net amount of work done will be
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
In the following two isothermals shown at temperatures $\;T_{1}\;$ and $\;T_{2}\;$ . Which of the following relations is correct ?
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
A gas is taken along a cyclic path as shown ABCDA in P - V diagram in two ways the change in internal energy is
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
S1: Heat absorbed during isothermal expansion of ideal gas in vacuum is zero. \[\] S2: Volume occupied by molecules of ideal gas is zero.
jeemain
physics
thermodynamics
cbse
class11
class12
q97
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
S1: $ \Delta G$ and $ \Delta H$ of a reaction always have the same sign. \[\] S2: $ \Delta G_f^{\circ}$ of carbon(graphite) is equal to zero.
jeemain
physics
thermodynamics
cbse
class11
class12
q94
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
. S1: $ \Delta H$ of a reaction is independent of temperature. \[\] S2: $\Delta H^{\circ}$ of a reaction = $ \sum H^{\circ}$(Products) - $ \sum H^{\circ}$(Reactants)
jeemain
physics
thermodynamics
cbse
class11
class12
q84
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
A system is taken from state A to state B through three different paths 1 , 2, 3 . The work done is minimum in
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
S1: Absolute values of H and E cannot be determined.\[\] S2: Both H and E are state functions.
jeemain
physics
thermodynamics
cbse
class11
class12
q96
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
S1: For the process to be spontaneous, both $ \Delta G$ as well as $ \Delta S$ has to be less than zero.\[\] S2: For spontaneous change, $ \Delta S_{Total} > 0.$
jeemain
physics
thermodynamics
cbse
class11
class12
q95
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
In an isochoric process $\;dQ : du\;$ =
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
S1: No heat engine has efficiency of 100% \[\] S2: Complete conversion of heat in to work is not possible.
jeemain
physics
thermodynamics
cbse
class11
class12
q92
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
S1: Reversible process and cyclic process have same meaning. \[\] S2: $\Delta H_{cycle}$ and $\Delta E_{cycle}$ is zero.
jeemain
physics
thermodynamics
cbse
class11
class12
q93
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
Which among the following is/are endothermic reaction(s)? \[\] (1) Combustion of methane \[\] (2) Decomposition of water \[\] (3) Dehydrogenation of ethane to ethane \[\] (4) Conversion of graphite to diamond
jeemain
physics
thermodynamics
cbse
class11
class12
q91
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
Two moles of a perfect gas undergoes following processes: \[\] 1. A reversible isobaric expansion from (1 atm, 20L) to (1 atm, 40L)\[\] 2. A reversible isochoric change of state from (1 atm, 40L) to (0.5 atm, 40L)\[\] 3. A reversible isothermal compression from (0.5 atm, 40L) to (1atm, 20L)\[\] Calculate the total work done involved in the above processes
jeemain
physics
thermodynamics
cbse
class11
class12
q90
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
1-pentyne(A) is treated with $4N$ alcoholic $KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2$-pentyne(B) and $3.5 \%$ of $1,2-$ pentadiene(C). The equilibrium was maintained at $175^{\circ}C. $ \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $B \leftrightharpoons C$
jeemain
physics
thermodynamics
cbse
class11
class12
q89
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
1-pentyne(A) is treated with $4N$ alcoholic $ KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2- $ pentyne(B) and $3.5 \%$ of $1,2- $ pentadiene(C). The equilibrium was maintained at $175^{\circ}C$. \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $ B \leftrightharpoons A$
jeemain
physics
thermodynamics
cbse
class11
class12
q88
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
A sample of Ar gas at 1 atm pressure and $27^{\circ}C$ expands reversibly and adiabatically from $1.25\: dm^3\: to\: 2.5\: dm^3$. Calculate enthalpy change of this process. $CV$ for argon is $ 12.4\: kJ/mol$
jeemain
physics
thermodynamics
cbse
class11
class12
q87
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
A monatomic ideal gas at temperature $ T_1$ is enclosed in a cylinder with frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing piston suddenly. If $L_1$ and $L_2$ are lengths of gas columns before and after expansion, then
jeemain
physics
thermodynamics
cbse
class11
class12
q86
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
Find the value of logKP for the reaction \[\] $N_2(g) + 3H_2(g) \leftrightharpoons 2NH_3(g) $ \[\] The standard enthalpy of formation of $ NH_3 \: is \: -46\: kJ$. The standard entropies of $N_2(g),\: H_2(g)\: and\: NH_3(g) \: are\: 191, 130\: and\: 192\: J/Kmol$ respectively. $(R = 8.3 \: J/Kmol)$
jeemain
physics
thermodynamics
cbse
class11
class12
q85
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
From the given data, calculate the enthalpy of combustion of cyclopropane at $298 \: K$. The enthalpy of formation of $CO_2(g), H_2O(l)$ and propene(g) are $-393.5, -285.8$ and $20.42 \: kJ/mol$ respectively. The enthalpy of isomerisation of cyclopropane to propene is $-33 \: kJ/mol$
jeemain
physics
thermodynamics
cbse
class11
class12
q83
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
The value of $ \Delta E$ for reversible isothermal evaporation of $90g$ of water at $100^{\circ}C$. Assume that water vapor behaves as ideal gas and $ \Delta H_{vap}$ of water is $540\: cal/g(R = 2\: cal/molK)$
jeemain
physics
thermodynamics
cbse
class11
class12
q82
difficult
asked
Mar 20, 2014
by
thanvigandhi_1
1
answer
The change in internal energy of a gas $\;du=$
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
Some amount of heat given to a gas under isothermal conditions will result in
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
If $\;du_{1}\;,du_{2}\;,du_{3}\;$ are change in internal energy of gas in isobaric , isothermal and adiabatic processes , then for the same change in temperature
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
$PV=nRT\;$ is true for
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
$dQ=du\;$ and $\;dw=0\;$ is
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
Increase in internal energy of a gas corresponds to
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
Heat supplied to a gas at constant pressure is utilised to
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
The amount of heat required to raise the temperature of a gas would be minimum when it is heated through
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 20, 2014
by
yamini.v
1
answer
In the experiment to find the value of unknown resistance using meter brige the circuit is as shown below . under the condition that the galavanometer shows null deflection value of R is :
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
Which of the following figures represents an integrated circuit?
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
The type of graph between length of a simple pendulum and time period is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
Which of the following statements is true? 1)Image formed by concave lens is always virtual. 2) Images formed by convex lens is always real. 3) Images formed by convex mirror is always virtual 4) Images formed by concave mirror is always real.
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
In transverse waves compression and rarification. 1)Occurs due to change in pressure 2) Change in density medium 3) Change in temperature of medium
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
A two terminal device is connected in a circuit and it is found it does no conduct both in forward and reverse bias and does not conduct in DC. The device is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 20, 2014
by
meena.p
1
answer
Compute the heat of formation of liquid methanol in kilojoules per mole, using the given data: \[\] $ \Delta H_{vap}$ of liquid methanol $= -38\: kJ/mol, \Delta H_f^{\circ}\: of\: H(g), C(g), O(g)$ respectively are $218, 715\: and\: 247\: kJ/mol$. Also, $ \Delta H_{C-H}, \Delta H_{C-O}, \Delta H_{O-H}$ being $415, 356, 463 \: kJ/mol$ respectively.
jeemain
physics
thermodynamics
cbse
class11
class12
q81
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
Enthalpy change involved in the oxidation of glucose is $-2880\: kJ/mol$. Twenty five percent of this energy is available for muscular work. If $100\: kJ$ of muscular work is required to walk one kilometer, what is the maximum distance that a person will be able to walk after eating $120g$ of glucose.
jeemain
physics
thermodynamics
cbse
class11
class12
q80
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
At $300\: K$, the standard enthalpies of formation of $C_6H_5COOH(s), CO_2(g)\: and\: H_2O(l)\: are\: -408, -393\: and\: -286 \: kJ/mol$ respectively. Calculate the heat of combustion of benzoic acid at constant volume and at constant pressure. $(R=8.31\: J/Kmol)$
jeemain
physics
thermodynamics
cbse
class11
class12
q79
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
A gas expands from a volume of $3\: dm^3$ against a constant external pressure of $3\: atm$. to a volume of $5\: dm^3$. The work of expansion is used to heat $ 10\: ml$ of water at $290\: K$. Calculate the final temperature of the water.
jeemain
physics
thermodynamics
cbse
class11
class12
q78
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
Water gas is fuel made by passing steam over red hot coke as $ H_2O(g) + C(s) \rightarrow CO(g)+H_2(g)$ \[\] Given that $ \Delta H_f^{\circ} \: of\: H_2O(g), CO(g)\: are\: -241.8\: and \: -110.5\: kJ/mol$. Also, the values of $S^{\circ}$ for $H_2O(g), C(s), CO(g)\: and\: H_2(g)\: are\: 188.7, 197.9, 131\: and\: 5.69\: J/Kmol$ respectively. Assuming $ \Delta H^{\circ}\: and\: \Delta S^{\circ}$ to be temperature independent, the temperature at which the reaction becomes favorable is
jeemain
physics
thermodynamics
cbse
class11
class12
q77
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
If the values of $ \Delta H_f^{\circ}\: for\: CH_4(g), C_2H_6(g), CO_2(g)\: and \: H_2O(l)$ are respectively $-74.85, -84.68, -393.5 \: and\: -286\: kJ/mol,$ predict which is more efficient fuel?
jeemain
physics
thermodynamics
cbse
class11
class12
q76
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
Calculate the resonance energy of $N_2O$ from the following data: \[\]$ \Delta H_f^{\circ}$ of $N_2O = 82 \: kJ/mol$, Bond energies of $N≡N,\: N=N,\: O=O \: and\: N=O$ bonds are $946,\: 418,\: 498\: and\: 607\: kJ/mol$ respectively
jeemain
physics
thermodynamics
cbse
class11
class12
q75
difficult
asked
Mar 19, 2014
by
thanvigandhi_1
1
answer
A two terminal device is connected in a circuit and is found that it conducts when either forward biased or reverse biased and also operates both in AC and DC. The device is
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Which of the following statements is not true?
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Which of the following will cool quickly
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Which of the four substance has lowest specific heat
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Newton's law of cooling is a special case of
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
Which of the following can be used to determine the velocity of sound in solids and gases
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
2
answers
In the experiment to find the speed of sound using resonance column if we replace the water with any other liquid the resonance position will
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
In resonance apparatus we get?
jeemain
physics
experimental-skills-in-physics
easy
asked
Mar 19, 2014
by
meena.p
1
answer
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