NEET Physics Thermodynamics Class 11 Questions

If a gas is compressed adiabatically by doing work of 150 J the change in internal energy of the gas is

The pressure of a gas changes linearly with volume from A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be

If for a gas $\frac{R}{C_v} = 0.67$, this gas is made up of molecules which are

The power radiated by a black body is P and it radiates maximum energy at wavelength $\lambda_0$. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $3\lambda_0$, the power radiated by it becomes nP. The value of n is:

Which one of the following is $u_m - T$ graph for perfectly black body? $u_m$ is the frequency of radiation with maximum intensity. T is the absolute temperature.

The temperature of a gas is –50°C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?

The value of $\gamma = \frac{C_p}{C_v}$, for hydrogen, helium and another ideal diatomic gas X (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to

In thermodynamics, heat and work are:

During an isothermal expansion of an ideal gas

A sample of gas is at 0°C. To what temperature it must be raised in order to double the r.m.s. speed of the molecule

Heat is given to an ideal gas in an isothermal process.

A. Internal energy of the gas will decrease.

B. Internal energy of the gas will increase.

C. Internal energy of the gas will not change.

D. The gas will do positive work.

E. The gas will do negative work. Choose the correct answer from the options given below:

A body with a mass 5 kg is acted upon by a force $\mathbf{F} = (-3\hat{i} + 4\hat{j})N$. If its initial velocity at t = 0 is $\mathbf{v} = (6\hat{i} - 12\hat{j}) \text{m/s}$, the time at which it will just have a velocity along the y-axis is

A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500°C and then placed on a large ice block. What is the maximum amount (approx.) of ice that can melt? (Specific heat copper = 0.39 J/g°C heat of fusion of water = 335 J/g).

An electric heater supplies heat to a system at a rate of 120 W. If system performs work at a rate of 80 J s⁻¹, the rate of increase in internal energy is

A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is: [Latent heat of ice is 3.4 × 10⁵ J/kg and g = 10 N/kg]

A diatomic gas (γ = 1.4) does 100 J of work when it is expanded isobarically. The heat given to the gas is:

The equation of state of a gas is given by $\left(P + \frac{a}{V^3}\right)\left(V - b^2\right) = cT$, where P, V, T are pressure, volume and temperature respectively, and a, b, c are constants. The dimensions of a and b are respectively

What is the dimensional formula of ab–1 in the equation (P + a/V²) (V – b) = RT, where letters have their usual meaning.

A faulty thermometer reads freezing point and boiling point of water as −5°C and 95°C respectively. What is the correct value of temperature as it reads 60°C on faulty thermometer?

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio Cₚ/Cᵥ for the gas is

The magnitude of heat exchanged by a system for the given cyclic process ABCA (as shown in figure) is (in SI unit)

In the pressure-volume (P⁻V) diagram shown below, a system undergoes a process from point A to point B along the curved path. Based on this curve, how does the work done by the system change during the process?

For Diatomic molecule which is not Rigid but has a additional vibrational Mode. Tick the correct statement.

Which of the following statements (s) is/are true? “Internal energy of an ideal gas — ”

The change in internal energy of one mole of gas when volume changes from V to 2V at constant pressure P is (γ is the adiabatic exponent)

A metal rod at a temperature of 150°C, radiates energy at a rate of 20 W. If its temperature is increased to 300°C, then it will radiate at the rate of

Match the column I with column II and mark the appropriate choice

Which of the following graphs represents exothermic reaction?

For an isothermal reversible expansion process, the value of q can be calculated by the expression

In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

Which is the correct relationship between ΔG° and equilibrium constant Kₚ?

The work done (in ergs) for the reversible expansion of one mole of an ideal gas from a volume of 10 L to 20 L at 25°C is

Which of the following statements regarding Gibb's energy change is correct?

In isolated system, find the condition for spontaneous reaction.

For a reaction to be spontaneous at any temperature, the conditions are

On the basis of thermochemical equations (i), (ii) and (iii), find out which of the algebraic relationships given in options (a) to (d) is correct: (i) C(graphite) + O₂(g) → CO₂(g) ; ΔH = x kJ mol⁻¹ (ii) C(graphite) + 1/2O₂(g) → CO(g) ; ΔH = y kJ mol⁻¹ (iii) CO(g) + 1/2O₂(g) → CO₂(g) ; ΔH = z kJ mol⁻¹

In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

The bond dissociation energies of X₂, Y₂ and XY are in the ratio of 1 : 0.5 : 1. ΔH for the formation of XY is –200 kJ mol⁻¹. The bond dissociation energy of X₂ will be

When 1 mole of a gas is heated at constant volume, temperature is raised from 298 to 308 K. If heat supplied to the gas is 500 J, then which statement is correct?

Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is

The entropy change can be calculated by using the expression, ΔS = qrev/T. When water freezes in a glass beaker, choose the correct statement amongst the following:

Based on the first law of thermodynamics, which one of the following is correct?

For a reaction, A(g) ⟶ A(l); ΔH = -3RT. The correct statement for the reaction is

The entropy change can be calculated by using the expression ΔS = qₑₓₜ/T. When water freezes in a glass beaker, choose the correct statement amongst the following.

Which of the following relation is not correct?

What is an adiabatic process?

What is the standard enthalpy change of combustion for one mole of butane?

What is the symbol for standard molar enthalpy of formation?

What is the role of Gibbs energy in determining the spontaneity of a chemical reaction?

What is the reference state of dihydrogen at 25°C and 1 bar pressure?