1st Law of Thermodynamics
Trending Questions
Q. Find the value of ΔU.


- +150 J
- -50 J
- +50 J
- -150 J
Q. 
Match the following:
1. WAB I. 0
2. WBC II. −1500J
3. WCA III. 1000J

Match the following:
1. WAB I. 0
2. WBC II. −1500J
3. WCA III. 1000J
- 1−II, 2−I, 3−III
- 1−I, 2−II, 3−III
- 1−III, 2−I, 3−II
- 1−III, 2−II, 3−I
Q. Find the value of \(\Delta U\).

\( K_{Q=50 J } \quad 30 J \)

\( K_{Q=50 J } \quad 30 J \)
Q. One mole of an ideal monatomic gas requires 210 J heat to raise the temperature by 10 K, when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by 10 K then heat required is
- 238 J
- 210 J
- 126 J
- 350 J
Q. An ideal gas undergoes an expansion from a state with temperature T1 and volume V1 through three different polytropic process A, B and C as shown in the P−V diagram. If |ΔEA|, |ΔEB| and |ΔEC| be the magnitude of changes in internal energy along the three paths respectively, then


- |ΔEA|<|ΔEB|<|ΔEC| if temperature in every process decreases
- |ΔEB|<|ΔEA|<|ΔEC| if temperature in every process increases
- |ΔEA|>|ΔEB|>|ΔEC| if temperature in every process increases
- |ΔEA|>|ΔEB|>|ΔEC| if temperature in every process decreases
Q.
An experimenter adds 970 J of heat to 1.75 mol of an ideal gas to heat it from 10.0∘C to 25.0∘C at constant pressure. The gas does +223 J of work during the expansion. (i) Calculate the change in internal energy of the gas. (ii) Calculate γ for the gas.
859 J; 1.81
747 J; 2.37
650 J ; 1.29
747 J ; 1.29
Q.
A system is any specified portion of matter which is separated from the rest of the universe with a definite boundary. (T/F)
True
False
Q.
Water contained in a metallic water bottle is an example of:
Isolated system
Open system
None
Closed system
Q. An insulator container contains 4 moles of an ideal diatomic gas at temperature T. Heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms but temperature of the gas remains constant. Then
- Q=RT
- Q=3RT
- Q=4RT
- Q=2RT
Q. Following figure shows on adiabatic cylindrical container of volume Vo divided by an adiabatic smooth piston (area of cross-section = A) in two equal parts. An ideal gas
is at pressure P1 and temperature T1 in left part and gas at pressure P2 and temperature T2 in right part. The piston is slowly displaced and released at a position where it can stay in equilibrium. The final pressure of the two parts will be (Suppose x = displacement of the piston)

