First Law Of Thermodynamic MCQ Level - 1 (Part - 1)

10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | First Law Of Thermodynamic MCQ Level - 1 (Part - 1)

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A vessel contains 1 mole of O2 gas (molar mass 32) at a temperature T. The pressure of the gas is p. An identical vessels containing one mole of the gas (molar mass 4) at a temperature 2T has a pressure of



A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is


Internal energy of n moles of an ideal gas at temperature T is given by

where, f = degrees of freedom
= 5 for O3 and 3 for Ar  [∴ O2 is diatomic, Ar is monoatomic]
The correct answer is: 11 RT


An ideal monoatomic gas is taken round that cycle ABCDA as shown in the p-V diagram (see figure). The work done during the cycle is


Work done in a cyclic process = area under the graph in p-V diagram
Area = AB × BC = (2p – p) × (2V – V) = pV
∴ So, work done = pV
The correct answer is: pV


In a given process of an ideal gas, dW = 0 and dQ < 0. The for the gas
Select one:


From first law of thermodynamics,
dQ = dU + dW
dQ = dU if dW = 0
Since, dQ < 0
Therefore,   or temperature will decrease
The correct answer is: the temperature will decrease


70 cal of heat are required to raise the temperature of 2 moles of an ideal diatomic gas at constant pressure from 30ºC to 35°C. The amount of heat required (in calorie) to raise the temperature of the same gas through the same range (30°C to 35°C) at constant volume is


We know that heat required to raise the temperature at constant pressure is Cp.
Similarly, at constant volume CV

The correct answer is: 50


An ideal gas is initially at temperature T and volume V. Its volume is increased by ΔV  due to an increase in temperature ΔT  pressure remaining constant. The quantity  varies with temperature as
Select one:


For an ideal gas : pV = nRT

For p = constant

Therefore,δ is inversely proportional to temperature T i.e., when T increases, δ decreases and vice-versa.
Hence,  graph will be rectangular hyperbola as shown in the above figure.
The correct answer is:  


When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied  which increases the internal energy of the gas is
Select one:



Starting with the same initial conditions, an ideal gas expands from volume V1 to V2 in three different ways, the work done by the gas is W1 if the process is purely isothermal, W2 if purely isobaric and W3 if purely adiabatic, then


The corresponding p-V graph (also called indicator diagram) in three different process will be as shown :

Area under the graph gives the work done by the gas.
(Area)2 > (Area)1 > (Area)3
∴ W2 > W1 > W3
The correct answer is:
W2 > W1 > W3


An ideal gas expands isothermally from a volume V1 to V2 and then compressed to original volumes V1 adiabatically. Initial pressure is p1 and final pressure is p3. The total work done is W. Then,
Select one:


Slope of adiabatic process at a given state (p, V, T) is more than the slope of isothermal process. The corresponding p-V graph for the two process is as shown in figure.

In the graph, AB is isothermal and BC is adiabatic.
WAB is positive (as volume is increasing)
and WBC is negative (as volume is decreasing)
 as area under p–V graph gives the work done.
From the graph itself, it is clear that p3 > p1
The correct answer is: p> p1 , W < 0


Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15°C till the temperature of the calorimeter and its contents rises to 80°C. The mass of the steam condensed (in kg) is
Select one:


Heat lost by steam =Heat gained by
(water +calorimeter)