Thermodynamics CBSE Questions & Answers

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. What is the final pressure of the gas in A and B?

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. What is the change in internal energy of the gas?

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. What is the change in the temperature of the gas?

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface?

A steam engine delivers 5.4\( \times \)\({\rm{1}}{0^{\rm{8}}}\) J of work per minute and services 3.6 \( \times \) \({\rm{1}}{0^{\rm{9}}}\) J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

An electric heater supplies heat to a system at a rate of 100W. If the system performs work at the rate of 75 joules per second, at what rate is the internal energy increasing?

A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Figure. Its volume is then reduced to the original value from E to F by an isobaric process. Calculate the total work done by the gas from D to E to F

A 1.0-mol sample of an ideal gas is kept at 0.0\(^\circ \)C during an expansion from 3.0 L to 10.0 L. How much energy transfer by heat occurs with the surroundings in this process?

A refrigerator is to maintain eatables kept inside at 9\(^\circ \) C. If room temperature is 36\(^\circ \) C, calculate the coefficient of performance.

A 1.0-mol sample of an ideal gas is kept at 0.0\(^\circ \)C during an expansion from 3.0 L to 10.0 L. How much work is done by the gas during the expansion?

A 1.0-mol sample of an ideal gas is kept at 0.0\(^\circ \)C during an expansion from 3.0 L to 10.0 L. If the gas is returned to the original volume by means of an isobaric process, how much work is done by the gas?

A 1.0-kg bar of copper is heated at atmospheric pressure. If its temperature increases from 20\(^\circ \)C to 50\(^\circ \)C, what is the work done by the copper on the surrounding atmosphere?

A 3.00-g copper penny at 25.0\(^\circ \)C drops from a height of 50.0 m to the ground. (a) If 60.0percent of the change in potential energy goes into increasing the internal energy, what is its final temperature?

A water heater is operated by solar power. If the solar collector has an area of 6.00 \({{\rm{m}}^{\rm{2}}}\) and the power delivered by sunlight is 550 W/ \({{\rm{m}}^{\rm{2}}}\), how long does it take to increase the temperature of 1.00 \({{\rm{m}}^{\rm{3}}}\) of water from 20.0\(^\circ \)C to 60.0\(^\circ \)C?

A sample of ideal gas is expanded to twice its original volume of 1.00 \({{\rm{m}}^{\rm{3}}}\) in a quasi-static process for which P = \({{\rm{V}}^{\rm{2}}}\) with \(\) = 5.00 atm/ \({{\rm{m}}^{\rm{6}}}\) . How much work is done by the expanding gas?