MEDIUM
11th West Bengal Board
IMPORTANT
Earn 100

Specific heat of argon at constant volume is 0.3122J/kg K. Find the specific heat of Argon at constant pressure if R=8.314 kJ/kmole K (Molecular weight of argon=39.95) in J/kg K is.

Important Questions on Thermodynamics

EASY
11th West Bengal Board
IMPORTANT
The temperature of 20×10-3 kg of oxygen is raised from 20°C to 100°C. Calculate the amount of heat absorbed, the increase in internal energy and the amount of work done by the gas when the increase in temperature takes place,
at constant volume.
MEDIUM
11th West Bengal Board
IMPORTANT
The temperature of 20×10-3 kg of oxygen is raised from 20°C to 100°C. Calculate the amount of heat absorbed, the increase in internal energy and the amount of work done by the gas when the increase in temperature takes place,
at constant pressure. (Given : molar gas constant R=8.4 J mol-1 K-1 and Cν for oxygen =0.155×4200 J kg-1 K-1)
MEDIUM
11th West Bengal Board
IMPORTANT

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

MEDIUM
11th West Bengal Board
IMPORTANT
Normal atmospheric pressure is 1.013×105 Nm-2 and the latent heat of melting of ice is 80 cal g-1. At 0°C and normal atmospheric pressure the volume of 1 g of water increases from 1 cm3 to 1.091 cm3 on freezing. What will be the change in its internal energy ?
EASY
11th West Bengal Board
IMPORTANT
1 kJ of heat is given to one mole of an ideal gas and its temperature rises 0°C to 100°C. If it is kept at a constant pressure throughout the heating, find the change in its internal energy.
EASY
11th West Bengal Board
IMPORTANT
One-half mole of helium gas is confined to a container at standard pressure and temperature 1.01×105 Pa, 273 K. How much heat is needed to double the pressure of the gas.
EASY
11th West Bengal Board
IMPORTANT
A cylinder fitted with a piston contains 0.10 mol of air at room temperature 20°C. The piston is pushed so slowly that the air within the cylinder remains essentially in thermal equilibrium with the surroundings. Find the work done by the air within the cylinder if the final volume is one-half the initial volume.
EASY
11th West Bengal Board
IMPORTANT
A sample of gas is allowed to expand quasistatically and adiabatically, its pressure drops from 120 to 100 Kpa, and its temperature drops from 300 K to 280 K. Is the gas monoatomic or diatomic ?