AIPMT Mains Physics Thermodynamics Class 11 Questions

An ideal gas goes from state A to state B via three different processes as indicated in the P⁻V diagram: If Q₁, Q₂, Q₃ indicate the heat a absorbed by the gas along the three processes and ΔU₁, ΔU₂, ΔU₃ indicate the change in internal energy along the three processes respectively, then

Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats $\left( \frac{C_p}{C_v} \right)$ of the mixture will be:

A thermocouple of negligible resistance produces an e.m.f. of 40 μV/°C in the linear range of temperature. A galvanometer of resistance 10 Ω whose sensitivity is 1 μA/div, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be

A mass of diatomic gas (γ = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from 27°C to 927°C. The pressure of the gas in the final state is

A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar what will happen to the volume of the bubble?

Consider the following process

ΔH(kJ/mol)

1/2 Å → B + 150 3B → 2C + $D^{-125}$ E + A → 2D + 350

For B + D → E + 2C, ΔH will be

What is the value of electron gain enthalpy of Na⁺ if IE₁ of Na = 5.1 eV?

If Cₚ and Cᵥ denote the specific heats (per unit mass) of an ideal gas of molecular weight M

The thermo e.m.f. E in volts of a certain thermo-couple is found to vary with temperature difference θ in °C between the two junctions according to the relation E =³⁰⁰⁻ θ²/15. The neutral temperature for the thermo-couple will be

A monoatomic gas at pressure P₁ and V₁ is compressed adiabatically to 1/8ᵗʰ its original volume. What is the final pressure of the gas?

Match List-I (Equations) with List-II (Type of process) and select the correct option

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be

For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS are 40.63 kJ mol⁻¹ and 108.8 J K⁻¹ mol⁻¹, respectively. The temperature when Gibbs energy change (ΔG) for this transformation will be zero, is

The following two reactions are known: Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g); ΔH = −26.8 kJ FeO(s) + CO(g) → Fe(s) + CO₂(g); ΔH = −16.5 kJ The value of ΔH for the following reaction Fe₂O₃(s) + CO(g) → 2FeO(s) + CO₂(g) is

In thermodynamic processes which of the following statements is not true?

A black body at 227°C radiates heat at the rate of 7 Cals/cm²s. At a temperature of 727°C, the rate of heat radiated in the same units will be:

The internal energy change in a system that has absorbed 2 Kcals of heat and done 500 J of work is:

The energy absorbed by each molecule (A₂) of a substance is 4.4 × 10⁻¹⁹ J and bond energy per molecule is 4.0 × 10⁻¹⁹ J. The kinetic energy of the molecule per atom will be:

The values of ΔH and ΔS for the reaction, C(graphite) + CO₂ (g) → 2CO(g) are 170 kJ and 170 JK⁻¹, respectively. This reaction will be spontaneous at

If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39° W and 239° W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39° C on the Celsius scale?

At 10°C the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110°C this ratio is

An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C.

If a gas expands at constant temperature, it indicates that