StudentAidUnit 6: Unit 6: Heat and Thermodynamics — Mcqs
11th Class Physics · Unit 6: Heat and Thermodynamics
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Multiple Choice Questions
6.1.In an isothermal change, internal energy:
6.2.First law of thermodynamics is based upon law of conservation of:
6.3.A device which coverts thermal energy into mechanical energy is called:
6.4.When two objects are made in thermal contact having same temperature, then they are at:
6.5.When the system is expanded by adding heat energy, then the work done will be:
6.6.Entropy of a system in reversible process:
- a Decrease
- b Increases
- c Is Infinite
- d Fluctuates
6.7.What happens to internal energy of an object when its temperature: (It should be written as: "The internal energy of an object increases when its temperature")
6.8.The value of Boltzmann constant is:
6.9.In an adiabatic process, there is no:
6.10.Thermodynamics mostly deals with:
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Kinetic theory of gases
1.According to kinetic theory of gases, a finite volume of a gas consists of very:
2.According to kinetic theory of gases, the size of the molecule is:
3.The gas molecules are in:
4.Collision between gas molecules are perfectly:
5.Pressure of a gas is directly proportional to average:
Gas equation
6.For one mole of an ideal gas the gas equation becomes:
7."R" is called:
8.The value of "R" is:
- a 8.314 J.mol^-1 K^-1
- b 8314 J k mol^-1 K^-1
- c Both (a) and (b)
- d 8.596 J.mol^-1 K^-1
9.K = R/N_A, Where k is called:
10.The value of Boltzmann constant is:
Gas laws
11.Boyle's law states that "The volume of a given mass of a gas is_________."
12.The expression for Boyle's law is:
13.The expression for Charles' law is:
- a V ∝ T
- b V/T = constant
- c V/P = constant
- d Both (a) & (b)
Entropy
14.SI unit of entropy is:
15.No entropy change is associated with:
16.The process in which entropy remain constant is:
17.Change in entropy is maximum when temperature of source is that _____ of sink:
- a Greater than
- b Less than
- c Equal to
- d Zero
18.When hot and cold water are mixed, the entropy:
19.In irreversible cyclic process the change in entropy of system:
- a Remains constant
- b Decreases
- c Increases
- d Becomes zero
20.In all natural processes where heat flows from one system to another, there is always a net increase in:
First law of thermodynamics
21.The change in internal energy is defined as:
22.The expression of 1st law of thermodynamic for adiabatic expansion is:
- a Q = ΔU + W
- b - W = ΔU
- c Q = W
- d Q = ΔU
23.A system does 600J of work and at the same time has its internal energy increased by 320J. How much heat has been supplied?
24.The expression of 1st law of thermodynamic for isothermal expansion is:
25.An addition of 400J of heat causes the increase in internal energy of system is equal to 300J, then work done will be:
Applications of first law of thermodynamics
26.Which is/are true for adiabatic process:
27.Which is not example of adiabatic process?
28.Adiabatic change occurs when the gas expands or compressed:
29.The process which is carried out at constant temperature is called:
30.Which one is not an isothermal change:
31.The process in which no heat enters or leaves the system is known as:
Internal energy
32.The sum of all forms of molecular energies of substance is termed as:
33.Internal energy of a substance, is directly proportional to:
34.Internal energy is similar to the:
- a Vibrational K.E
- b Gravitational P.E
- c K.E
- d All of these
35.If amount of heat enters into the system, the internal energy:
- a Increases
- b Decreases
- c Remains the same
- d Both a & b
Ideal gas
36.For an ideal gas, the potential energy associated with its molecules is:
Kinetic energy
37.The kinetic molecular theory of gas suggests that average K.E. per molecular is:
38.KE of molecule of an ideal gas at absolutely zero will be:
Carnot cycle and carnot engine
39.Carnot cycle is:
40.Efficiency of a carnot engine is:
41.In carnot engine, each process is:
- a Reversible
- b Preferable Reversible
- c Irreversible
- d Perfectly irreversible
42.The efficiency of carnot engine depends upon:
43.The efficiency of carnot engine is always:
- a Greater than real engine
- b Less than real engine
- c Equal to the real engine
- d Both (a) & (b)
Work done by gas
44.Work done by the system is taken as:
45.What can be calculated from the curve under PV graph?