First Law of Thermodynamics MCQ. We covered all the First Law of Thermodynamics MCQ in this post for free so that you can practice well for the exam.
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MCQ on First Law of Thermodynamics for Students
CO₂ gas at an initial pressure of 50 atm. and a temperature of 300°K undergoes an adiabatic, free expansion in which the final volume is 20 times that of the original volume. The change in temperature of the gas is equal to
1. 3.3°C
2. 33°C
3. 0°C
4. 33 K
Option 2 – 33°C
The entropy of the thermodynamic system increases, when the system is made use of to convert
1. Heat into work at a cyclic operation
2. Heat into work is a cyclic operation
3. Work in Heat at a constant temperature
4. Work in Heat in a cyclic operation
The combined form of the first and second laws of thermodynamics is given by
1. dU = T dS+dQ
2. dQ = T dS+ P dV
3. T ds = dU – PdV
4. None
Option 1 – dU = T dS+dQ
Following this statement is the transition of a system from thermodynamics. a. The heat absorbed by it along any reversible path is independent of the path. b. The change of entropy of the system in a reversible process is also independent of the path. c. The change of entropy of the system in a reversible process is independent of the path.
1. a and b are correct
2. b and c are correct
3. b is alone correct
4. None of above
Option 2 – b and c are correct
Gibb’s function G in thermodynamics is G = H-TS where H is enthalpy and S entropy, and T is temperature. In isothermal, isobaric, and reversible processes G
1. varies linearly
2. varies non-linearly
3. remains constant, but not zero
4. is zero
Option 3 – remains constant, but not zero
Which one of the following properties of a body remains constant during the reversible adiabatic process?
1. Entropy
2. Temperature
3. Specific heat
4. Enthalpy
Option 1 – Entropy
The total gain in entropy of the working substance in Carnot’s cycle is
1. Positive
2. Entropy remains the same
3. Negative
4. None
Option 2 – Entropy remains the same
In the case of a reversible, isothermal, isobaric process, Gibb’s function G = H-TS then
1. G>0 and changes with temperature
2. G = constant
3. G<0 and changes with entropy
4. G changes with both temperature and entropy
Option 2 – G = constant
The entropy of a gaseous system decreases when the gas expands.
1. by doing work adiabatically
2. by seepage without any change in volume
3. by doing work thermally
4. none
Option 2 – by seepage without any change in volume
The amount of mechanical work done to completely melt 1 gram of ice is
1. 336 J
2. 80 J
3. 36 J
4. 42 J
Option 1 – 336 J
The energy emitted per second black by a body of 1227°C is E. If the temperature of the blackbody is increased to 2727°C the energy emitted per second in terms of E
1. 16E
2. 4E
3. 2E
4. 8E
Option 1 – 16E
A perfect gas at 27°C is heated at constant pressure so its volume is double its original. Then the temperature of the gas is
1. 300°C
2. 600°C
3. 54°C
4. 327°C
Option 2 – 600°C
In an ideal gas, the internal energy system depends on.
1. temperature
2. pressure
3. volume
4. molecule’s size
Option 1 – temperature
In the P-V diagram area ‘under’ the curve represents
1. work done on
2. thermo dynamic process
3. work done in a cyclic process
4. None
Option 1 – work done on
The temperature in Kelvin, at which the average speed of H, molecules will be the same as that of N. molecules at 35°C will be
1. 495
2. 22
3. 275
4. 42
Option 2 – 22
In a given process on an ideal gas, dW = 0 and dQ < 0. Then for gas
1. The temperature will decrease
2. The volume will increase
3. The pressure will remain constant
4. The temperature will increase
Option 1 – The temperature will decrease
In the P-V diagram area inside the closed curve represents.
1. work done in a cyclic process
2. thermo dynamic process
3. system’s condition
4. None
Option 1 – work done in a cyclic process
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