Related InterviewSolutions

• A sample of air weighing `1.18 g` occupies `1.0 xx 10^(3) cm^(3)` when kept at `300 K and 1.0 xx 10^(5)` pa. When `2.0 cal` of heat is added to it constant volume, its temperature increases by `1^@C`. Calculate the amount if heat needed to increases the temperature of air by `1^@C` at constant pressure if the mechanical equivalent of heat si `4.2 xx 10^(-1)` . Assume that air behaves as an ideal gas.
• Figure shows a cylindrical container containing oxyegn `(gamma = 1.4)` and closed by a 50 kg frictionless piston. The area of cross section is `100cm(2)` , atmospheric pressure is `100 kPa`+E2 and g is 10 m s^(-2)`. The cylinder is slowly heated for some time. Find the amount of heat supplied to gas if the piston moves out through a distsnce of 20 cm. .
• The volume of an ideal gas `(gamma 1.5 )` is changed adiabatically from 4.00 liters to 3.00 liters . Find the ratio of (a) the final pressure to the initial pressure and (b) the final temperature to the initial temperature.A.B.C.D.
• An ideal gas at pressure` 2.5 xx 10^(5)` `pa` and temperture `300k` occupies `100 cc`. It is adiabatically compressed to half its original volume. Calculate (a) the final pressure, (b) the final temperature and ( c) the work done by the gas in the peocess. Take `(gamma = 1.5)`.
• Air `(gamma = 1.4 )` is pumped at 20atm pressure in a motor tyre at `20^@C`. If the tyre suddenly bursts, what would be the temperature of the air coming out of the tyre. Neglect any mixing with the atmoshpheric air.
• A given sample of an ideal gas `(gamma = 1.5 )` is compressed adiabatically from a volume of `150 cm ^(3)` to `50 cm ^(3)`. The initial pressure and the initial temperature are `150 kpa` and `300K`. Find (a) the number of moles of the gas in the sample, (b) the molar heat capacity at constant volume, (c) the final pressure and temperature, (d) the work done by the gas in the process and (e) the change in internal energy of the gas .
• A gas is enclosed in a cylindrical can fitted with a piston. The walls of the can and the piston are adiabatic. The initial pressure , volume and temperture of the gas are `100 kpa, 400cm^(3)` and `300k` respectively. The ratio of the specific heat capacities of the gas is `(C_p / C_v = 1.5)` Find the pressure and the temperature of the gas if it is (a) suddenly compressed (b) slowly compressed to 100 cm^(3).
• A gas kept in a container of finite conductivity is suddenly compressed . The processA. must be very nearly adiabaticB. must be very nearly isothermalC. may be very nearly adiabaticD. may be very nearly isothermal
• `0.32 g` of exygen is kept in a rigid container and is heated. Find the amount of heat needed to raise the temperature from `25^0 C to 35^0 C`. The molar heat capacity of oxygen at constant volume is `20 J K^(-1) mol^(-1)`.
• A sample of ideal gas `(gamma = 1.4)` is heated at constant pressure. If `140 J` of heat is supplied to gas, find `DeltaU` and W`.