1) The first law of thermodynamics is conservation of...................
Ans. Energy
2) The change in entropy is.............
Ans. Positive in an irreversible change
3) Change in entropy depends.........
Ans. On the thermodynamic state
4) The Gibb's function G in thermodynamics is defined as G = H-TS. In an isothermal, isobaric, reversible process, G.............
Ans. remains constant but not zero
5) When applied to solar radiation, Planck's law reduces to Wien's law in the............
Ans. Ultraviolet region
6) According to Maxwell's law of distribution of velocities of molecules, the most probable velocity is........
Ans. Less than the root mean square velocity
7) In a micro canonical ensemble, a system A of fixed volume is in contact with a large reservoir B. Then.......
Ans. A can exchange neither energy nor particles with B
8) In a canonical ensemble, a system A of fixed volume is in contact with a large reservoir B. Then.......
Ans. A can exchange only energy with B
9) In a grand canonical ensemble, a system A of fixed volume is in contact with a large reservoir B. Then.......
Ans. A can exchange both energy and particles with B
10) In case of Bose - Einsteinc .................
Ans. Number of particles increases in lower energy levels at low temperatures and high pressures
11) The quantum statistics reduces to classical statistics under the following condition..............
Ans. ρ λ3 >> 1
12) According to Debye's theory of specific heat at high temperature specific heat is proportional to.......
Ans. Independent of T
13) According to Debye's theory of specific heat at low temperature specific heat is proportional to.......
Ans. T3
14) Specific heat of metals can be expressed as.................
Ans. AT + BT3
15) The term “thermodynamics” comes from the Greek words ‘therme’ and ‘dynamic which means _______.
Ans. Heat power
16) The term “thermodynamics” was first used in 1849 in the publication of a
Ans. Lord Kelvin
17) The electrons in an atom which rotate about the nucleus possess what kind of energy?
Ans. Rotational kinetic energy
18) The molecules of gas moving through space with some velocity possess what kind of energy?
Ans. Translational energy
19) What form of energy refers to those a system possesses as a whole with respect to some outside reference frame, such as potential and kinetic energies?
Ans. A macroscopic form of energy
20) What type of system energy is related to the molecular structure of a system?
Ans. Microscopic form of energy
21) The sum of all the microscopic form of energy is called _____.
Ans. Internal energy
22) What does the term “uniform” mean?
Ans. No change with location
23) What is a process during which the specific volume remains constant?
Ans. Isochoric or isometric process
24) What is a process during which the pressure remains constant?
Ans. Isobaric process
25) What is a process with identical end states called?
Ans. Cycle
26) How many independent properties are required to completely fix the equilibrium state of a gaseous compound state?
Ans. 2
27) Only those processes are possible in nature which would give an entropy ____ for the system and the surroundings together.
Ans. increase
28) When the potential gradient is ____, the entropy change of the universe is ____
Ans. infinitesimal, zero
29) At equilibrium, the isolated system exists at the peak of the entropyhill and
Ans. dS=0
30) When work is dissipated into internal energy, what is the change in the disorderly motion of molecules?
Ans. Increases
31) When heat is imparted to a system,
Ans. the disorderly motion of molecules increases and the entropy of the system increases
32) Which of the following relation is correct?
Ans. S=K*lnW
33) When does the entropy of a system become zero?
Ans. W=1
34) According to the Boltzmann,
Ans. he introduced the thermodynamic probability with each state, increase
in entropy implies that the system proceeds by itself towards a state of
higher thermodynamic probability; an irreversible process goes on
happening until the most probable is achieved.
35) Phase space is a ________.
Ans. 6 Dimensional Space
36) Maxwell-Boltzmann law is for the ________
Ans. Distinguishable particles
37) The Maxwell-Boltzmann law is given by the expression ________
Ans. 1/e (α+EkT)
38) Maxwell-Boltzmann statistics cannot be applied to _____________
Ans. Photons
39) The ratio of rms velocity to most probable velocity is ________
Ans. √3: √2
40) The average kinetic energy associated with each degree of freedom is
________
Ans. kT/2
41) The density of molecules is maximum at which speed?
Ans.Vp
42) What would be the most probable velocity for one Oxygen molecule at
300 K?
Ans. 714 m/s
43) Mass of A is 4 times that of B. What is the ratio of their mean velocities?
Ans. 1: 2
44) What is the Kinetic Energy of 2 g of oxygen at -23℃?
Ans. 194.86 J
45) What is the rms speed of methane at 27℃?
Ans. 678 m/s
46) The study of the flow of heat or any other form of energy in to or out of a system undergoing physical or chemical change is called ------
Ans. Thermodynamics
47) The third law of thermodynamics states that in the limit T→0
Ans. S=0
48) Planck proposed the relationship between the entropy of a system and the thermodynamic probability is given by the equation _______
Ans. S=klnw
49) The vibrational partition function equation is given by ___________
Ans. qvib =1/1-e-hυ/kT
50) The phosphorescence is otherwise known as -------------
Ans. delayed fluorescence
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